date:20201112

On Wednesday 11 November 2020 21:20:48 Chris Albertson wrote:

> The information is gone.  There is no way to automatically reconstruct
> a curve from a sequence of straight lines.  A human can do this
> because he can see what was intended.
>
> A better approach is to create a slicer that can work with .STEP files
> directly.   The trouble with that is the mathematics gets hard.   If
> you remember basic algebra, it is easy to find where two lines
> intersect if you have the equations for each of them.  There is no
> need to guess, you get an exact solution in one shot.  It is easy
> enough that they can even teach this to 13-year-old kids.But just
> try and find the intersection of a line and a curve.  Except for
> special cases, you are forced to solve it numerically which is very
> slow and a slicer needs to do this many millions of times.  Slow,
> but in theory, it could be done.
>
> So the practical solution, what we all use is to create STL files that
> have a specified maximum deviation from the ideal surface.   You can
> set this to 1/10,000 inch if you like and then any error is
> undetectable.   Slicing a file like that would be slow but slicing a
> STEP file would be way-slower.
>
> The OTHER thing we can do to make better 3D prints and I suspect if
> you found a good design, this was done, is to design around the
> capabilities of the printer.  Use simple ideas like filets and wall
> thicknesses that are multiples of the nozzle diameter.  It is not hard
> and if you are designing from scratch you can make a wall 1.60 mm
> thick rather than 1.5 mm and it will come out better if using a 0.4 mm
> nozzle.  There are probably a dozen more tricks like that.
>
> On Wed, Nov 11, 2020 at 5:41 PM Gregg Eshelman via Emc-users <
>
> emc-users@lists.sourceforge.net> wrote:
> > Since it looks like there's little or no progress on an update to
> > the STL format, there is work going on for 3D printer G-code post
> > processing to refine and smooth curves or even convert curves
> > defined by a series of straights to real arcs for printers that have
> > hardware and firmware capable of doing real arcs.
> >Supposedly units are arbitrary in STL. There's nothing in the
> > file format (unless with a proprietary command that only specific
> > printers understand) for indicating what unit or scale to use.
> > Assume 1 unit = 1mm and design accordingly. In the 3D software I
> > use, for STL export it makes a meter, centimeter, or millimeter all
> > equal 1mm. I use the different model and world unit settings to best
> > fit whatever I'm doing on the screen. Design tiny stuff in Meters in
> > a Centimeter world and big stuff in Centimeters in a Meter world.
> > Working in US units produces STLs that aren't the expected size.
> > It's all the fault of 3D Systems. When they created STL they were
> > only thinking of millimeters because their early stereo lithography
> > printers that scanned a LASER across the top of a tank of resin only
> > made rather small parts. One of the first products prototyped with
> > those was the roller clamp used on IV fluid lines and that was a
> > pretty large 3D print in its day.
> > A little bit of foresight and they would have made STL able to
> > support many types of units. Just a simple UNITS= line at the start
> > and have the printer software able to read that and adapt the
> > movements. On Wednesday, November 11, 2020, 09:47:14 AM MST, Chris
> > Albertson < albertson.ch...@gmail.com> wrote:
> >  Remember the workflow.  You start with a 3D model where the
> > resolution is literally "perfect" as the curves are defined by
> > mathematical functions. Then you convert the 3D model to an STL and
> > an STL can contain only straight lines.  No circles, no curves. 
> > When you make the STL you get to specify a maximum error but small
> > errors mean big files.
> >
> > So when you look for a gear or sprocket ALWAYS look to see if you
> > can get the 3D CAD file and not just the STL.  The best places are
> > the big resellers like Boston Gear, McMaster Carr, SPD,..  they all
> > have "perfect" 3D CAD models, usually.STEP file type.

And freecad-19 can load that.  But can it export the .stl's?

> > If you do download an STL then you are accepting some other random
> > person's idea of what is a good error tolerance without even knowing
> > what he specified.

And this obviously is a major PITA for someone like me, looking for a 
usable bit of code. 

> > *So make the STL file yourself. * I usually go overboard with
> > resolution in the STL and specify something like 0.001 mm or less
> > allowed error.

Which will result in huge .stl and .gcode files. And therein lies another 
problem.  Re-slicing after changing filaments, like from PLA to PETG, 
which changes all the temps, and using a root copy of mc to overwrite 
the files that are changed by this on the sd card, I find the file on 
the sd card is NOT changed by the overwrite, so I have to yet again 
change the TF card,

Re: [Emc-users] Emc-users Digest, Vol 175, Issue 37

2020-11-12 Thread bruno schwander

Not true. Vectorizers do that, convert from non vector formats (bitmaps) or
simple vector (just lines)  into vector format including curves and lines.
Look into the algos used in Autotrace (OSS) for example.

Bruno

Date: Wed, 11 Nov 2020 18:20:48 -0800
> From: Chris Albertson 
>
> The information is gone.  There is no way to automatically reconstruct a
> curve from a sequence of straight lines.  A human can do this because he
> can see what was intended.
>
>

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Re: [Emc-users] ender 3 and low quality sprockets

On Thu, 12 Nov 2020 at 02:22, Chris Albertson  wrote:

> A better approach is to create a slicer that can work with .STEP files
> directly.

Or slice inside the CAD software itself, where 100% of the design data
is available.

This isn't as hard as it sounds, I have even done it, using the
built-in API of Autodesk Inventor:
https://youtu.be/hefY46fyVvU

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912


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Re: [Emc-users] anti-freeze recommendation for water cooled spindle motors

2020-11-12 Thread Dave Cole

I have been using Pink RV antifreeze for years in my horizontal
bandsaw. The pump has been submersed in it for 7 years or so. I
never goes bad and stuff never seems to grow in it, but it does
evaporate slowly. I just add more. I use it full strength. The
Anticorrosives in it seem to keep rust at bay as well. Its a generic
7x10 bandsaw.
I buy the stuff anyway to winterize my boat, so I always have some
around. Last time I bought it for just over $2/gallon.

Distilled water is quite corrosive. I would avoid that by itself. See
the link below:

https://www.corrosionpedia.com/definition/407/distilled-water#:~:text=Despite%20its%20benefits%2C%20distilled%20water,carbon%20dioxide%20from%20the%20air.

However I buy gallons of distilled water from the market to dilute full
strength auto antifreeze.

Dave

On 11/9/2020 10:58 PM, dave engvall wrote:
IIRC RV grade antifreeze is propylene glycol and often flavored with a
bit of methyl salicylate. Easy to tell if you have it all flushed out.
You will be able to taste the oil of wintergreen long after the pink
dye is gone.

Dave

On 11/7/20 6:46 PM, Gene Heskett wrote:

On Saturday 07 November 2020 19:15:46 Jon Elson wrote:

On 11/07/2020 05:34 PM, Gene Heskett wrote:

Greetings all;

I have just found that food grade antifreeze in the water seems to
be a nono for long term useage as motor coolant.

Why do you need food grade in a recirculating system? How
about plain old antifreeze, which has lubes and
anti-corrosion additives. Or, they make a coolant for TIG
torches that has the same stuff.
I've had the same stuff in my TIG torch for over a decade,
and it still runs fine.

Jon

I'll get some 50-50, about 5 gallons and change it. After only minimal
useage for a year, this stuff is really ugly pink snot. I need to caulk
around the line cord too as that is the only place insects can get in an
drown. The rv stuff must smell good to them.

The amplifier came back. I'll send a check Monday.

Thanks Jon.

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Cheers, Gene Heskett

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Re: [Emc-users] More questions for the 3d 'spurts

2020-11-12 Thread John Dammeyer

Mill it out of aluminium.  Counter bores for the screws.  Total time spent will 
be way less than 3D printing it.  There are places for 3D printing.  I use it 
all the time.  But it's easy to get into that place where when you have a 
hammer everything looks like a nail.
John


> -Original Message-
> From: Gene Heskett [mailto:ghesk...@shentel.net]
> Sent: November-12-20 9:02 AM
> To: Enhanced Machine Controller (EMC)
> Subject: [Emc-users] More questions for the 3d 'spurts
> 
> 2 scans attached if they get thru the listserver.
> 
> I am having a problem with this part, printed right side up, I am getting
> this from PETG at 250C nozzle/70C bed. The ledge in the center,
> destroyed as you can see, has an overhang of about 1.5mm to retain the
> bearing. Turned over, its destroying the bottoms of the cap screw
> counterbores. And the supports in the bolt holes are being caught and
> pulled back out of the holes, mucking up the bottoms of the counterbores
> that bolt it all together.
> 
> Suggested fixes?
> 
> Thanks.
> 
> Cheers, Gene Heskett
> --
> "There are four boxes to be used in defense of liberty:
>  soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> If we desire respect for the law, we must first make the law respectable.
>  - Louis D. Brandeis
> Genes Web page 



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[Emc-users] canned cycles


Hello,


I am trying to learn how to do canned cycles for a lathe (benchtop, 
Sherline) with linuxcnc



So I watched some videos with some simple examples, but when I try 
running them in axis, it complains about "unknown g-code used.



Wild guess here is that maybe some g codes are not implemented? Does 
anyone know what codes to use instead? (or any pointers to some very 
simple examples of canned cycles that will work in linuxcnc?



Below is what I am trying to 'reproduce', the youtube links are in a comment


thanks,


Ron


example 1:

%
( https://www.youtube.com/watch?v=o9vXeH8lCjQ )
( G72 canned cycle )
G0 X0.45 Z.2
G72 W.04 R.05
G72 P100 Q102 UO. W.005 F.006
N100 G0 Z0.
G1 X-.064
N102 Z.2
%


example 2:

%
( https://www.youtube.com/watch?v=0zqbN5cu1Es )
(G71 canned cycle)
G0 X3. Z.1    (Start Position)

G71 U.1 R.05  (Depth of cut and retract distance)
G71 P100 Q110 U.03 W.01 F.01  (SEQ #'s and material left for finish pass 
and feed rate)

N100 G0 X.5   (smallest diameter)
G1 Z-.4
X1.
Z-1.
X1.5  (geometry of the part)
X2.
Z-2.3
X2.5
Z-3.8
N110 X3.  (start diameter)
%



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Re: [Emc-users] Emc-users Digest, Vol 175, Issue 37

2020-11-12 Thread Gregg Eshelman via Emc-users

One of the latest ways of making curves from 
lines.https://hackaday.com/2020/11/03/this-gcode-post-processor-squeezes-lines-into-arcs/


On Thursday, November 12, 2020, 03:16:43 AM MST, bruno schwander 
 wrote:  
 
 Not true. Vectorizers do that, convert from non vector formats (bitmaps) or
simple vector (just lines)  into vector format including curves and lines.
Look into the algos used in Autotrace (OSS) for example.

Bruno

Date: Wed, 11 Nov 2020 18:20:48 -0800
> From: Chris Albertson 
>
> The information is gone.  There is no way to automatically reconstruct a
> curve from a sequence of straight lines.  A human can do this because he
> can see what was intended.  
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Re: [Emc-users] canned cycles

2020-11-12 Thread ken.strauss

Perhaps see 
https://www.forum.linuxcnc.org/26-turning/34298-support-for-g72-and-g71 ?
What version of LinuxCNC are you using?

-Original Message-
From: R C  
Sent: November 12, 2020 12:59 PM
To: linuxcnc-users-list 
Subject: [Emc-users] canned cycles

Hello,


I am trying to learn how to do canned cycles for a lathe (benchtop, 
Sherline) with linuxcnc


So I watched some videos with some simple examples, but when I try 
running them in axis, it complains about "unknown g-code used.


Wild guess here is that maybe some g codes are not implemented? Does 
anyone know what codes to use instead? (or any pointers to some very 
simple examples of canned cycles that will work in linuxcnc?


Below is what I am trying to 'reproduce', the youtube links are in a comment


thanks,


Ron


example 1:

%
( https://www.youtube.com/watch?v=o9vXeH8lCjQ )
( G72 canned cycle )
G0 X0.45 Z.2
G72 W.04 R.05
G72 P100 Q102 UO. W.005 F.006
N100 G0 Z0.
G1 X-.064
N102 Z.2
%


example 2:

%
( https://www.youtube.com/watch?v=0zqbN5cu1Es )
(G71 canned cycle)
G0 X3. Z.1(Start Position)

G71 U.1 R.05  (Depth of cut and retract distance)
G71 P100 Q110 U.03 W.01 F.01  (SEQ #'s and material left for finish pass 
and feed rate)
N100 G0 X.5   (smallest diameter)
G1 Z-.4
X1.
Z-1.
X1.5  (geometry of the part)
X2.
Z-2.3
X2.5
Z-3.8
N110 X3.  (start diameter)
%



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Re: [Emc-users] More questions for the 3d 'spurts

On Thu, 12 Nov 2020 at 17:05, Gene Heskett  wrote:

> Suggested fixes?

Countersunk screws instead of counterbored? More likely to be self-supporting.

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912


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Re: [Emc-users] canned cycles

On Thu, 12 Nov 2020 at 18:01, R C  wrote:

> So I watched some videos with some simple examples, but when I try
> running them in axis, it complains about "unknown g-code used.

G71 and G72 are implemented in LinuxCNC 2.9 but not in 2.8.

You can have G71 and G72 in 2.8 via a Python remap. if you really need
them. But the control letters are different from the ones in 2.9
(different authors, different times)

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912


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Re: [Emc-users] More questions for the 3d 'spurts

You can not print over the top of air.   If there is an overhang you need
to enable "support" in Cura.  If you do then Cura will print some removable
structure under the overhang.

Most people when they design parts try to design them so they can be
printed without supports by avoiding overhangs but sometimes you
can't avoid it.

On a single extruder printer, you have to use the same material for
supports as for the part.  (On a dual-head printer you can use
water-soluble support and get a much nicer result but that is expensive)

The suggestion to make the part in metal is good.   But we like to print
them first to verify fit and function.  Then after it is seen to work,
generate the OTHER kind of g-code from the same design file and send it to
your mill.  But this workflow fails if you don't make both printed and
milled parts from the same design file.

A hybrid technique I sometimes use is to print the part with under
sized holes and then machine the holes to size.  The tool needs to move
VERY slow so as to not heat the plastic it is cutting.  Same with
counterbores, OK, more details, You CAN print over air if the "ceiling"
has a 45 or 60 degree slope.  So make your counter-bores have "vaulted
ceilings" and then after the print is finish machine the bottom of the
counterbores flat.Plastic is so soft you can use the counterbore cutter
by hand.  I do the same with counter-sink holes for flathead screws.  I
"finish" them with a cutter,

On Thu, Nov 12, 2020 at 9:05 AM Gene Heskett  wrote:

> 2 scans attached if they get thru the listserver.
>
> I am having a problem with this part, printed right side up, I am getting
> this from PETG at 250C nozzle/70C bed. The ledge in the center,
> destroyed as you can see, has an overhang of about 1.5mm to retain the
> bearing. Turned over, its destroying the bottoms of the cap screw
> counterbores. And the supports in the bolt holes are being caught and
> pulled back out of the holes, mucking up the bottoms of the counterbores
> that bolt it all together.
>
> Suggested fixes?
>
> Thanks.
>
> Cheers, Gene Heskett
> --
> "There are four boxes to be used in defense of liberty:
>  soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> If we desire respect for the law, we must first make the law respectable.
>  - Louis D. Brandeis
> Genes Web page 
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> https://lists.sourceforge.net/lists/listinfo/emc-users
>

-- 

Chris Albertson
Redondo Beach, California

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Re: [Emc-users] canned cycles




I'll check out that link.


I am using linuxcnc 2.7.15

On 11/12/20 11:04 AM, ken.stra...@gmail.com wrote:

Perhaps see 
https://www.forum.linuxcnc.org/26-turning/34298-support-for-g72-and-g71 ?
What version of LinuxCNC are you using?

-Original Message-
From: R C 
Sent: November 12, 2020 12:59 PM
To: linuxcnc-users-list 
Subject: [Emc-users] canned cycles

Hello,


I am trying to learn how to do canned cycles for a lathe (benchtop,
Sherline) with linuxcnc


So I watched some videos with some simple examples, but when I try
running them in axis, it complains about "unknown g-code used.


Wild guess here is that maybe some g codes are not implemented? Does
anyone know what codes to use instead? (or any pointers to some very
simple examples of canned cycles that will work in linuxcnc?


Below is what I am trying to 'reproduce', the youtube links are in a comment


thanks,


Ron


example 1:

%
( https://www.youtube.com/watch?v=o9vXeH8lCjQ )
( G72 canned cycle )
G0 X0.45 Z.2
G72 W.04 R.05
G72 P100 Q102 UO. W.005 F.006
N100 G0 Z0.
G1 X-.064
N102 Z.2
%


example 2:

%
( https://www.youtube.com/watch?v=0zqbN5cu1Es )
(G71 canned cycle)
G0 X3. Z.1(Start Position)

G71 U.1 R.05  (Depth of cut and retract distance)
G71 P100 Q110 U.03 W.01 F.01  (SEQ #'s and material left for finish pass
and feed rate)
N100 G0 X.5   (smallest diameter)
G1 Z-.4
X1.
Z-1.
X1.5  (geometry of the part)
X2.
Z-2.3
X2.5
Z-3.8
N110 X3.  (start diameter)
%



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Re: [Emc-users] More questions for the 3d 'spurts

2020-11-12 Thread Bruce Layne

I haven't used PETG, but I'd print that part with 5 outer layers (looks
like you're using 12-15) and 20% infill (50% maximum).  It'll print
faster and it'll probably be stronger in many respects.  An FDM printer
lays down strands of hot plastic that squish into each other.  If a part
is printed as a solid, it'll contract when it cools and there will be so
much internal stress that the part can tear itself apart.  That's
usually seen as layer separation, particularly when using high shrinkage
materials such as ABS, but most people don't print with as many outer
layers as you're using.  You may be experiencing layer separation in the
X and Y directions instead of the Z direction.

I'm not saying that's the problem you're experiencing, but I think
reducing internal stress would be a good start in the right direction.

That's one of the things I like about MSLA resin printers.  I can print
completely solid hard polyurethane objects without concerns over
internal stresses, and with no interlayer bonding weaknesses as we have
with FDM printing.  Resin printers make more heterogeneous parts that
are very strong in all directions.




-Original Message-
> From: Gene Heskett [mailto:ghesk...@shentel.net]
> Sent: November-12-20 9:02 AM
> To: Enhanced Machine Controller (EMC)
> Subject: [Emc-users] More questions for the 3d 'spurts
>
> 2 scans attached if they get thru the listserver.
>
> I am having a problem with this part, printed right side up, I am getting
> this from PETG at 250C nozzle/70C bed. The ledge in the center,
> destroyed as you can see, has an overhang of about 1.5mm to retain the
> bearing. Turned over, its destroying the bottoms of the cap screw
> counterbores. And the supports in the bolt holes are being caught and
> pulled back out of the holes, mucking up the bottoms of the counterbores
> that bolt it all together.
>
> Suggested fixes?
>
> Thanks.
>
> Cheers, Gene Heskett
> --
> "There are four boxes to be used in defense of liberty:
>  soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> If we desire respect for the law, we must first make the law respectable.
>  - Louis D. Brandeis
> Genes Web page 



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Re: [Emc-users] anti-freeze recommendation for water cooled spindle motors

On Thursday 12 November 2020 12:00:20 Dave Cole wrote:

> I have been using Pink RV antifreeze for years in my horizontal
> bandsaw.   The pump has been submersed in it for 7 years or so.    I
> never goes bad and stuff never seems to grow in it, but it does
> evaporate slowly.   I just add more. I use it full strength.   The
> Anticorrosives in it seem to keep rust at bay as well.   Its a generic
> 7x10 bandsaw.
> I buy the stuff anyway to winterize my boat, so I always have some
> around.  Last time I bought it for just over $2/gallon.
>
> Distilled water is quite corrosive.   I would avoid that by itself. 
> See the link below:
>
> https://www.corrosionpedia.com/definition/407/distilled-water#:~:text=
>Despite%20its%20benefits%2C%20distilled%20water,carbon%20dioxide%20from
>%20the%20air.

The high cost of distilled at the store, and the limited supply's on the 
shelf when you need to clean up a watercooled transmitter that may need 
500 gallons a whack, long ago drove us broadcasters to de-ionized water. 
Commonly obtained from tap water for makeup, a Culligan de-ionizer can, 
when setup as a 10 gallon an hour bypass off the main 10 hp pump, 
usually an 80-100 gallon a minute Ingersol-Rand with an all bronze head. 
Can clean up what we captured off the roof of the transmitter building 
on a mountaintop in about 24 hours, and in 96 hours can give a probe it 
with a dvm reading that's higher than the 20 to 100 megs top reading of 
such a $30 meter. To give you folks an idea of the diff it makes, when I 
walked in the door at wdtv-5 in Oct of '84, they were scheduling an 
overnight downtime at 6 month intervals that often ran till hours after 
the signon time the next morning while we replaced a good share of the 
plumbing fittings that corrosion had nearly destroyed with the 
electrolysis from running 50 gallons a minute thru the finals, running 
at 7200 volts on the other end of the hoses, could do to the fittings 
inside the ends of the hookup hoses. I installed a Culligan de-ionizer 
on a bypass circuit. Took a couple $100 recharges of that a year because 
our makeup water was off the building roof. I replaced the leakage 
meter, a 100 ma model, with a 50 microamp version and instructed the 
operators to log the reading daily and call me when it got up to 10 
microamps. On June 30th 2008 when I was long retired, and that then 65 
yo GE analog transmitter site was turned off forever, the system had not 
been hardly touched except to refresh that cartridge. I had cut 2" off 
the hoses to inspect the barbs, and replaced the hoses once because they 
were so age hardened I could drive the barbs back into them. In about 17 
years the last time I looked at them the brass hose barbs were 
discolored but otherwise undamaged by any further corrosion. Its all in 
how good a condition you keep the water in.  And it costs a lot less 
overall to do it right.  Distilled water isn't near as good as 
de-ionized can be, but I'll run it anyway since I can't buy even a 
throwaway cartridge that small. I wish I could.

> However I buy gallons of distilled water from the market to dilute
> full strength auto antifreeze.

That stuff is poison to such a transmitter, those additives make it 
essentially a short circuit, so we used technical grade ethylene glycol, 
max 30% because it also makes the water carry less heat per gallon and 
more viscous and hard to pump at the 70+ GPM needed by each of a pair of 
$125,000 4KM100LA klystrons. Today we'ed use a 20hp pump and a vfd to 
maintain the flow, plus air flow louvers we thermostaticly closed to 
keep it from freezing in a -25F Nebraska winter.

Yeah, you could say I've been there and done that. ;-)
> Dave
>
> On 11/9/2020 10:58 PM, dave engvall wrote:
> > IIRC RV grade antifreeze is propylene glycol and often flavored with
> > a bit of methyl salicylate. Easy to tell if you have it all flushed
> > out. You will be able to taste the oil of wintergreen long after the
> > pink dye is gone.
> >
> > Dave
> >
> > On 11/7/20 6:46 PM, Gene Heskett wrote:
> >> On Saturday 07 November 2020 19:15:46 Jon Elson wrote:
> >>> On 11/07/2020 05:34 PM, Gene Heskett wrote:
>  Greetings all;
> 
>  I have just found that food grade antifreeze in the water seems
>  to be a nono for long term useage as motor coolant.
> >>>
> >>> Why do you need food grade in a recirculating system?  How
> >>> about plain old antifreeze, which has lubes and
> >>> anti-corrosion additives. Or, they make a coolant for TIG
> >>> torches that has the same stuff.
> >>> I've had the same stuff in my TIG torch for over a decade,
> >>> and it still runs fine.
> >>>
> >>> Jon
> >>
> >> I'll get some 50-50, about 5 gallons and change it. After only
> >> minimal useage for a year, this stuff is really ugly pink snot. I
> >> need to caulk around the line cord too as that is the only place
> >> insects can get in an drown. The rv stuff must smell good to them.
> >>
> >> The amplifier came back. I'll send a check M

Re: [Emc-users] canned cycles



On 11/12/20 11:07 AM, andy pugh wrote:

On Thu, 12 Nov 2020 at 18:01, R C  wrote:


So I watched some videos with some simple examples, but when I try
running them in axis, it complains about "unknown g-code used.

G71 and G72 are implemented in LinuxCNC 2.9 but not in 2.8.

You can have G71 and G72 in 2.8 via a Python remap. if you really need
them. But the control letters are different from the ones in 2.9
(different authors, different times)



Seems like I better start installing  Linuxcnc 2.9 then. Is tehre a 
stable version that I can download?  (what is the URL ?)



thanks,


Ron








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Re: [Emc-users] More questions for the 3d 'spurts

Yes, this is in line with my suggestions to design based on the materials
you are using.  Countersinks have more bearing surface and are stronger in
plastic than counterbores but MORE IMPORTENTLY a countersink can be printed
upside down (or any orientations) with no need for a support structure.

 There are lots of design tricks for plastic.   In metal, we like to have
flat mating surfaces because they are easy to machine with a fly cutter.
But in plastic, we can print wavey mating surfaces that interlock and self
align.  I like to use hemispherical bumps that fit into hemispherical
"divots".   Then the screws don't need to take any shear forces.   It is
trivial to do this in plastic so "why not?

On Thu, Nov 12, 2020 at 10:08 AM andy pugh  wrote:

> On Thu, 12 Nov 2020 at 17:05, Gene Heskett  wrote:
>
> > Suggested fixes?
>
> Countersunk screws instead of counterbored? More likely to be
> self-supporting.
>
> --
> atp
> "A motorcycle is a bicycle with a pandemonium attachment and is
> designed for the especial use of mechanical geniuses, daredevils and
> lunatics."
> — George Fitch, Atlanta Constitution Newspaper, 1912
>
>
> ___
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> https://lists.sourceforge.net/lists/listinfo/emc-users
>

-- 

Chris Albertson
Redondo Beach, California

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Re: [Emc-users] More questions for the 3d 'spurts

On Thursday 12 November 2020 12:38:19 John Dammeyer wrote:

> Mill it out of aluminium.  Counter bores for the screws.  Total time
> spent will be way less than 3D printing it.  There are places for 3D
> printing.  I use it all the time.  But it's easy to get into that
> place where when you have a hammer everything looks like a nail. John
>
How do I make that .stl into gcode to drive one of my mills? Do we have 
such a critter?

And I expect to have a similar problem with the full sized lid. The other 
half of that same bearing is half buried it it, same problem. 

I'll have to print both and take measurements to write the gcode I guess 
since the .stl doesn't AFAIK have a size, that is up to the printer. 
I've 1/8" plate I can make both parts out of.

> > -Original Message-
> > From: Gene Heskett [mailto:ghesk...@shentel.net]
> > Sent: November-12-20 9:02 AM
> > To: Enhanced Machine Controller (EMC)
> > Subject: [Emc-users] More questions for the 3d 'spurts
> >
> > 2 scans attached if they get thru the listserver.
> >
> > I am having a problem with this part, printed right side up, I am
> > getting this from PETG at 250C nozzle/70C bed. The ledge in the
> > center, destroyed as you can see, has an overhang of about 1.5mm to
> > retain the bearing. Turned over, its destroying the bottoms of the
> > cap screw counterbores. And the supports in the bolt holes are being
> > caught and pulled back out of the holes, mucking up the bottoms of
> > the counterbores that bolt it all together.
> >
> > Suggested fixes?
> >
> > Thanks.
> >
> > Cheers, Gene Heskett
> > --
> > "There are four boxes to be used in defense of liberty:
> >  soap, ballot, jury, and ammo. Please use in that order."
> > -Ed Howdershelt (Author)
> > If we desire respect for the law, we must first make the law
> > respectable. - Louis D. Brandeis
> > Genes Web page 
>
> ___
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> https://lists.sourceforge.net/lists/listinfo/emc-users


Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 


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Re: [Emc-users] canned cycles

On Thu, 12 Nov 2020 at 18:21, R C  wrote:

> Seems like I better start installing  Linuxcnc 2.9 then. Is tehre a
> stable version that I can download?  (what is the URL ?)

Sorry, no. 2.9 is the dev version and inherently a little unstable.

buildbot.linuxcnc.org has instructions.

The Python remap will also work with 2.7.15, if that suits you better.

Are you using software stepping?

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912

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Re: [Emc-users] canned cycles



On 11/12/20 11:47 AM, andy pugh wrote:

On Thu, 12 Nov 2020 at 18:21, R C  wrote:


Seems like I better start installing  Linuxcnc 2.9 then. Is tehre a
stable version that I can download?  (what is the URL ?)

Sorry, no. 2.9 is the dev version and inherently a little unstable.



I did see 2.8, I'll install that on a different tray, so I can swap the 
2.7.15 install back if for some reason I have issues.





buildbot.linuxcnc.org has instructions.



I might try that.




The Python remap will also work with 2.7.15, if that suits you better.

Are you using software stepping?

uhm..  I have no idea what "software stepping" means?    I think I read 
something about that Python remap,  where can I find that?



thanks,


Ron





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Re: [Emc-users] canned cycles

On Thu, 12 Nov 2020 at 18:56, R C  wrote:

> I did see 2.8, I'll install that on a different tray, so I can swap the
> 2.7.15 install back if for some reason I have issues.

Whilst 2.8 is better than 2.7 in myriad ways, it isn't actually any
better in respect to G71 and G72.
> > Are you using software stepping?
> >
> uhm..  I have no idea what "software stepping" means?

Are you using the parallel port to generate step pulses?

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912


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Re: [Emc-users] canned cycles




On 11/12/20 12:32 PM, andy pugh wrote:

On Thu, 12 Nov 2020 at 18:56, R C  wrote:


I did see 2.8, I'll install that on a different tray, so I can swap the
2.7.15 install back if for some reason I have issues.

Whilst 2.8 is better than 2.7 in myriad ways, it isn't actually any
better in respect to G71 and G72.


I started installing it, it's acting up (the network/dhcp part), so now 
I have to figure out what is going on, before it keeps me up at night :




Are you using software stepping?


uhm..  I have no idea what "software stepping" means?

Are you using the parallel port to generate step pulses?


yes I am using parallel ports.




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Re: [Emc-users] Velocity fluctuating, when I try to jog the machine

2020-11-12 Thread Viesturs Lācis

Hello!

I did that. Long story short, the problem is still there. The motion
is still not smooth, it is oscillating the machine.
Any ideas, what to look for? Could it be related to overall
performance of PC? I have got "unexpected realtime delay" warning
message with standart 1ms servo thread period length, so I suspect
that there is a room for optimization as it is some kind of dual-core
Celerons and 4gb of RAM. I bought the parts this summer, so the
motherboard should not be outdated. Now that I think about it, when I
jog the machine and release the arrow key, it continues for at least
full second, if not more, before it actually starts to decelerate.

Nicklas, what do you mean with autorepeat?

Viesturs

pirmd., 2020. g. 9. nov., plkst. 00:30 — lietotājs Peter C. Wallace
() rakstīja:
>
> I would start over with a pncconf created configuration
>
>
> On Mon, 9 Nov 2020, Viesturs L?cis wrote:
>
> > Date: Mon, 9 Nov 2020 00:00:55 +0200
> > From: "[UTF-8] Viesturs L?cis" 
> > Reply-To: "Enhanced Machine Controller (EMC)"
> > 
> > To: "Enhanced Machine Controller (EMC)" 
> > Subject: [Emc-users] Velocity fluctuating, when I try to jog the machine
> >
> > Hello!
> >
> > I am stuck on a problem that I cannot figure out.
> > Please take a look here: https://youtu.be/LtP9wE-FUN4
> > It should be steady jogging back and forth at 1074 mm/min. The motor
> > is not moving at a constant pace and I noticed that the DRO also shows
> > that the velocity is not steady. So that tells me that my wiring is ok
> > and there is no interference with step signals or whatever, but the
> > software is to blame.
> > Where should I start looking for the cause?
> > And then there are 2 more sidequestions (that might have arised only
> > because there have been 5 or 6 years since my previous LinuxCNC build,
> > so I might just missed something obvious):
> > The machine has 7i96 board. I need to use 2 outputs. How do I find
> > their corresponding HAL pin names? Previously I would just "setp
> > ...gpio.xx.is-output 1" and then try to switch that output and see, if
> > it worked or no, but here for 7i96 I saw that some gpio pins are
> > inputs only, but the thing is that my counting suggests that those
> > should be the outputs.
> > And the second question is about creating gantry config. How do I do
> > that with the new gentrivkins? I have AXIS=Y for joints 1 and 3, but
> > that is not enough.
> >
> > Viesturs
> >
> > P.S. Here are the INI and HAL files:
> > # This file was created with the 7i96 Wizard on Dec 23 2018 15:02:21
> > # Changes to most things are ok and will be read by the wizard
> >
> > [EMC]
> > VERSION = 1.1
> > MACHINE = A.V.U. Plazma
> > DEBUG = 0x
> >
> > [HOSTMOT2]
> > DRIVER = hm2_eth
> > IPADDRESS = "10.10.10.10"
> > BOARD = 7i96
> > STEPGENS = 3
> > ENCODERS = 1
> > SSERIAL_PORT = 0
> >
> > [DISPLAY]
> > DISPLAY = axis
> > POSITION_OFFSET = RELATIVE
> > POSITION_FEEDBACK = ACTUAL
> > MAX_FEED_OVERRIDE = 2.0
> > CYCLE_TIME = 0.1
> > INTRO_GRAPHIC = emc2.gif
> > INTRO_TIME = 0
> > OPEN_FILE = ""
> >
> > [KINS]
> > KINEMATICS = trivkins
> > JOINTS = 4
> >
> > [EMCIO]
> > EMCIO = io
> > CYCLE_TIME = 0.100
> > TOOL_TABLE = tool.tbl
> >
> > [RS274NGC]
> > PARAMETER_FILE = plasma.var
> >
> > [EMCMOT]
> > EMCMOT = motmod
> > SERVO_PERIOD = 100
> >
> > [TASK]
> > TASK = milltask
> > CYCLE_TIME = 0.010
> >
> > [TRAJ]
> > COORDINATES = XYZ
> > LINEAR_UNITS = metric
> > ANGULAR_UNITS = degree
> > MAX_LINEAR_VELOCITY = 150.00
> >
> > [HAL]
> > HALFILE = hm2-stepper.hal
> > # HALFILE = io.hal
> > # HALFILE = custom.hal
> > # HALFILE = postgui.hal
> >
> > [HALUI]
> >
> > [AXIS_X]
> > MIN_LIMIT = -10.0
> > MAX_LIMIT = 3050.0
> > MAX_VELOCITY = 200.0
> > MAX_ACCELERATION = 500.0
> >
> > [AXIS_Y]
> > MIN_LIMIT = -10.0
> > MAX_LIMIT = 1650.0
> > MAX_VELOCITY = 200.0
> > MAX_ACCELERATION = 500.0
> >
> > [AXIS_Z]
> > MIN_LIMIT = -10.01
> > MAX_LIMIT = 250.0
> > MAX_VELOCITY = 15.0
> > MAX_ACCELERATION = 400.0
> >
> > [AXIS_A]
> > MIN_LIMIT = -10.0
> > MAX_LIMIT = 1650.0
> > MAX_VELOCITY = 200.0
> > MAX_ACCELERATION = 500.0
> >
> >
> > [JOINT_0]
> > AXIS = X
> > MIN_LIMIT = -10.0
> > MAX_LIMIT = 3050.0
> > MAX_VELOCITY = 200.0
> > MAX_ACCELERATION = 550.0
> > TYPE = LINEAR
> > SCALE = 50.9295817894065
> > STEPGEN_MAX_VEL = 260.0
> > STEPGEN_MAX_ACC = 600.0
> > FERROR = 0.5
> > MIN_FERROR = 0.3
> >
> > DIRSETUP = 6000
> > DIRHOLD = 6000
> > STEPLEN = 2700
> > STEPSPACE = 2700
> >
> > HOME = 0.0
> > HOME_OFFSET = 0.0
> > HOME_USE_INDEX = False
> > HOME_IGNORE_LIMITS = False
> >
> >
> > [JOINT_1]
> > AXIS = Y
> > MIN_LIMIT = -10.0
> > MAX_LIMIT = 1650.0
> > MAX_VELOCITY = 200.0
> > MAX_ACCELERATION = 550.0
> > TYPE = LINEAR
> > SCALE = 50.9295817894065
> > STEPGEN_MAX_VEL = 260.0
> > STEPGEN_MAX_ACC = 600.0
> > FERROR = 0.5
> > MIN_FERROR = 0.3
> >
> > DIRSETUP = 6000
> > DIRHOLD = 6000
> > STEPLEN = 2700
> > STEPSPACE = 2700
> >
> > HOME = 0.0
> > HOME_OFFSET = 0.0
> > HOME_USE_INDEX = False
> > HOME_IGNORE_LIMITS = Fal

Re: [Emc-users] More questions for the 3d 'spurts

You can convert an STL file back to a 2d CAD file but it requires some hand
work and reverse engineering.  It is not hard for a human to see a counter
sunk screw hole and know it is a hole for an M4 CC screw but the software
just sees 5,000 triangles.   So it can't be automated but it is not hard to
do by hand.
Or ask the designer to send the files to you or maybe it is already posted
on Thingiverse.   So one option is to get the CAD file, even if you have to
re-draw the part.  If you can get a CAD file then there are many CAM
options, some free, some very expensive that people here can tell you
about.  This is what the professionals do.

The other option is to work from the STL.   There are a couple of milling
methods.  One is "waterline" where you drop the Z-axis by 0.001 and move it
every place there is to be no metal, to drop  it by another 0.001 and
repeat.  It is very much like 3D printing but with a tiny size end mill.
You simply "print air" and what is left over is the part.   But the g-code
for this knows nothing about the shape of the part.  It is just doing a
raster pattern.   Another method is to allow the z-axis to follow the part
shape as it makes a raster over the part.   But deep dives on "Z" can break
a small end mill.

PyCAM will generate milling g-code from STL and it is free.
https://github.com/SebKuzminsky/pycam

It is always better to start from a real CAD file so the milling can be
dome more intelligently.

i
On Thu, Nov 12, 2020 at 10:35 AM Gene Heskett  wrote:

> On Thursday 12 November 2020 12:38:19 John Dammeyer wrote:
>
> > Mill it out of aluminium.  Counter bores for the screws.  Total time
> > spent will be way less than 3D printing it.  There are places for 3D
> > printing.  I use it all the time.  But it's easy to get into that
> > place where when you have a hammer everything looks like a nail. John
> >
> How do I make that .stl into gcode to drive one of my mills? Do we have
> such a critter?
>
> And I expect to have a similar problem with the full sized lid. The other
> half of that same bearing is half buried it it, same problem.
>
> I'll have to print both and take measurements to write the gcode I guess
> since the .stl doesn't AFAIK have a size, that is up to the printer.
> I've 1/8" plate I can make both parts out of.
>
> > > -Original Message-
> > > From: Gene Heskett [mailto:ghesk...@shentel.net]
> > > Sent: November-12-20 9:02 AM
> > > To: Enhanced Machine Controller (EMC)
> > > Subject: [Emc-users] More questions for the 3d 'spurts
> > >
> > > 2 scans attached if they get thru the listserver.
> > >
> > > I am having a problem with this part, printed right side up, I am
> > > getting this from PETG at 250C nozzle/70C bed. The ledge in the
> > > center, destroyed as you can see, has an overhang of about 1.5mm to
> > > retain the bearing. Turned over, its destroying the bottoms of the
> > > cap screw counterbores. And the supports in the bolt holes are being
> > > caught and pulled back out of the holes, mucking up the bottoms of
> > > the counterbores that bolt it all together.
> > >
> > > Suggested fixes?
> > >
> > > Thanks.
> > >
> > > Cheers, Gene Heskett
> > > --
> > > "There are four boxes to be used in defense of liberty:
> > >  soap, ballot, jury, and ammo. Please use in that order."
> > > -Ed Howdershelt (Author)
> > > If we desire respect for the law, we must first make the law
> > > respectable. - Louis D. Brandeis
> > > Genes Web page 
> >
> > ___
> > Emc-users mailing list
> > Emc-users@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/emc-users
>
>
> Cheers, Gene Heskett
> --
> "There are four boxes to be used in defense of liberty:
>  soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> If we desire respect for the law, we must first make the law respectable.
>  - Louis D. Brandeis
> Genes Web page 
>
>
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
>

-- 

Chris Albertson
Redondo Beach, California

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Re: [Emc-users] Velocity fluctuating, when I try to jog the machine

On Thu, 12 Nov 2020 at 20:21, Viesturs Lācis  wrote:
> Now that I think about it, when I
> jog the machine and release the arrow key, it continues for at least
> full second, if not more, before it actually starts to decelerate.

Do you see that with physical jog buttons? I am trying to work out if
that is a motion system lag or a UI lag.

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912


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Re: [Emc-users] More questions for the 3d 'spurts

On Thu, 12 Nov 2020 at 18:35, Gene Heskett  wrote:

> How do I make that .stl into gcode to drive one of my mills?

How do you normally make G-code?

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912


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Re: [Emc-users] Velocity fluctuating, when I try to jog the machine

2020-11-12 Thread Viesturs Lācis

I see that with keyboard buttons. I will try to wire something to 7i96
inputs and use it as jog signal. I will return there next week.

Any ideas about those oscillations?

Viesturs

ceturtd., 2020. g. 12. nov., plkst. 22:39 — lietotājs andy pugh
() rakstīja:
>
> On Thu, 12 Nov 2020 at 20:21, Viesturs Lācis  wrote:
> > Now that I think about it, when I
> > jog the machine and release the arrow key, it continues for at least
> > full second, if not more, before it actually starts to decelerate.
>
> Do you see that with physical jog buttons? I am trying to work out if
> that is a motion system lag or a UI lag.
>
> --
> atp
> "A motorcycle is a bicycle with a pandemonium attachment and is
> designed for the especial use of mechanical geniuses, daredevils and
> lunatics."
> — George Fitch, Atlanta Constitution Newspaper, 1912
>
>
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Re: [Emc-users] More questions for the 3d 'spurts

2020-11-12 Thread Gregg Eshelman via Emc-users

A Google for get dimensions from stl file shows there's many ways to do that.
On Thursday, November 12, 2020, 11:35:23 AM MST, Gene Heskett 
 wrote:  

 On Thursday 12 November 2020 12:38:19 John Dammeyer wrote:

> Mill it out of aluminium.  Counter bores for the screws.  Total time
> spent will be way less than 3D printing it.  There are places for 3D
> printing.  I use it all the time.  But it's easy to get into that
> place where when you have a hammer everything looks like a nail. John
>
How do I make that .stl into gcode to drive one of my mills? Do we have 
such a critter?

And I expect to have a similar problem with the full sized lid. The other 
half of that same bearing is half buried it it, same problem. 

I'll have to print both and take measurements to write the gcode I guess 
since the .stl doesn't AFAIK have a size, that is up to the printer. 
I've 1/8" plate I can make both parts out of.  
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Re: [Emc-users] Velocity fluctuating, when I try to jog the machine

2020-11-12 Thread Peter C. Wallace





Any ideas about those oscillations?

Viesturs



Can you post your hal/ini files?

Peter Wallace
Mesa Electronics




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Re: [Emc-users] More questions for the 3d 'spurts

On Thursday 12 November 2020 13:09:43 Chris Albertson wrote:

> You can not print over the top of air.   If there is an overhang you
> need to enable "support" in Cura.  If you do then Cura will print some
> removable structure under the overhang.
>
> Most people when they design parts try to design them so they can be
> printed without supports by avoiding overhangs but sometimes you
> can't avoid it.
>
> On a single extruder printer, you have to use the same material for
> supports as for the part.  (On a dual-head printer you can use
> water-soluble support and get a much nicer result but that is
> expensive)
>
> The suggestion to make the part in metal is good.   But we like to
> print them first to verify fit and function.  Then after it is seen to
> work, generate the OTHER kind of g-code from the same design file and
> send it to your mill.  But this workflow fails if you don't make both
> printed and milled parts from the same design file.

And the design file isn't in the zip. Darnit. Nothing but the .stl's. So 
I think I'll print them, and try to get accurate measurements for 1/8" 
alu sheet. The Lid itself, I just realized has all the counterbores on 
the same side.  Except the tracks for the belt adjusting sliders. Grrr.
Most of the night and its only 53% done, and the central infill, 
supposedly 20%, is mostly missing. I hope I can get usable measurements 
from it. At 65% done I had turned the nozzle back up 7C to 250C, the 
flow up to 70% from 62%, and at 4.68mm up its looking somewhat better. 
250C is as hot as the ender 3 pro will go. I think for PETG, a bigger 
heater and a 270C limit would be more suitable. But it is what it is.

> A hybrid technique I sometimes use is to print the part with under
> sized holes and then machine the holes to size.  The tool needs to
> move VERY slow so as to not heat the plastic it is cutting.  Same with
> counterbores, OK, more details, You CAN print over air if the
> "ceiling" has a 45 or 60 degree slope.  So make your counter-bores
> have "vaulted ceilings" and then after the print is finish machine the
> bottom of the counterbores flat.Plastic is so soft you can use the
> counterbore cutter by hand.  I do the same with counter-sink holes for
> flathead screws.  I "finish" them with a cutter,

In metal I use a 1/8th inch carbide endmill and generate the counterbore 
with arcgenm18.py. counterbore.py is broken. Its output won't go by 
lcnc's arc test at file loading. 50% error 100% of the time.

Thanks Chris.

> On Thu, Nov 12, 2020 at 9:05 AM Gene Heskett  
wrote:
> > 2 scans attached if they get thru the listserver.
> >
> > I am having a problem with this part, printed right side up, I am
> > getting this from PETG at 250C nozzle/70C bed. The ledge in the
> > center, destroyed as you can see, has an overhang of about 1.5mm to
> > retain the bearing. Turned over, its destroying the bottoms of the
> > cap screw counterbores. And the supports in the bolt holes are being
> > caught and pulled back out of the holes, mucking up the bottoms of
> > the counterbores that bolt it all together.
> >
> > Suggested fixes?
> >
> > Thanks.
> >
> > Cheers, Gene Heskett
> > --
> > "There are four boxes to be used in defense of liberty:
> >  soap, ballot, jury, and ammo. Please use in that order."
> > -Ed Howdershelt (Author)
> > If we desire respect for the law, we must first make the law
> > respectable. - Louis D. Brandeis
> > Genes Web page 
> > ___
> > Emc-users mailing list
> > Emc-users@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/emc-users


Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 


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Re: [Emc-users] More questions for the 3d 'spurts

On Thursday 12 November 2020 13:19:21 Chris Albertson wrote:

> Yes, this is in line with my suggestions to design based on the
> materials you are using.  Countersinks have more bearing surface and
> are stronger in plastic than counterbores but MORE IMPORTENTLY a
> countersink can be printed upside down (or any orientations) with no
> need for a support structure.
>
>  There are lots of design tricks for plastic.   In metal, we like to
> have flat mating surfaces because they are easy to machine with a fly
> cutter. But in plastic, we can print wavey mating surfaces that
> interlock and self align.  I like to use hemispherical bumps that fit
> into hemispherical "divots".   Then the screws don't need to take any
> shear forces.   It is trivial to do this in plastic so "why not?
>
Why not indeed. But freecad is going to have to grow more tools to do 
that and I'll have to learn them. If I can...

Thanks Chris.

> On Thu, Nov 12, 2020 at 10:08 AM andy pugh  wrote:
> > On Thu, 12 Nov 2020 at 17:05, Gene Heskett  
wrote:
> > > Suggested fixes?
> >
> > Countersunk screws instead of counterbored? More likely to be
> > self-supporting.
> >
> > --
> > atp
> > "A motorcycle is a bicycle with a pandemonium attachment and is
> > designed for the especial use of mechanical geniuses, daredevils and
> > lunatics."
> > — George Fitch, Atlanta Constitution Newspaper, 1912
> >
> >
> > ___
> > Emc-users mailing list
> > Emc-users@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/emc-users


Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 


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Re: [Emc-users] canned cycles

On Thursday 12 November 2020 13:19:25 R C wrote:

> On 11/12/20 11:07 AM, andy pugh wrote:
> > On Thu, 12 Nov 2020 at 18:01, R C  wrote:
> >> So I watched some videos with some simple examples, but when I try
> >> running them in axis, it complains about "unknown g-code used.
> >
> > G71 and G72 are implemented in LinuxCNC 2.9 but not in 2.8.
> >
> > You can have G71 and G72 in 2.8 via a Python remap. if you really
> > need them. But the control letters are different from the ones in
> > 2.9 (different authors, different times)
>
> Seems like I better start installing  Linuxcnc 2.9 then. Is tehre a
> stable version that I can download?  (what is the URL ?)
>
>
> thanks,
>
>
> Ron

for debian "deb http://buildbot.linuxcnc.org/"; your distro's 
version, "buster" IIRC
>
>
>
>
>
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Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 


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[Emc-users] Named subroutines

2020-11-12 Thread Ralph Stirling

I was reading the docs on remapping, and got to
wondering if the o call syntax
discussed in: 
http://linuxcnc.org/docs/html/remap/remap.html
could be used directly in G-code programs.  I would
really rather put:

o call 1 2 3

in my program than remap M100 to make that call, 
and then put:

M100 A1 B2 C3

in my program.

Should this be possible?

Thanks,
-- Ralph

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Re: [Emc-users] Named subroutines

On Fri, 13 Nov 2020 at 00:19, Ralph Stirling
 wrote:
>
> I was reading the docs on remapping, and got to
> wondering if the o call syntax
> discussed in:
> http://linuxcnc.org/docs/html/remap/remap.html
> could be used directly in G-code programs.

Yes. Though oddly the docs don't mention it in the subroutine section.
http://linuxcnc.org/docs/html/gcode/o-code.html#ocode:subroutines

I tested with:

O SUB
(DEBUG, #1)
O ENDSUB

O CALL [22]
M2





-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912


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Re: [Emc-users] More questions for the 3d 'spurts

On Thursday 12 November 2020 15:38:04 andy pugh wrote:

> On Thu, 12 Nov 2020 at 18:35, Gene Heskett  
wrote:
> > How do I make that .stl into gcode to drive one of my mills?
>
> How do you normally make G-code?

In nano or geany, from my wet ram. The only helper I regularly use is 
arcgenm18.py and the Documentation.pdf open to the gcode pages on 
another workspace. Well over 3/4ths of the gcode in my nc_files 
directorys is straight out of my wet ram and fingers.

How did you think I was coming up with some of the more off the wall 
ideas?  I see something I'd like to fix, and I'm asking here how to go 
about it.  And I generally get accurate, helpfull answers from you, 
thank you. A lot.

But the next Q is for Seb K. I just moved a copy of pycam-master.zip I 
just downloaded (which doesn't seem to be in debian later than wheezy) 
to the rpi4, running the raspian version of buster in armhf flavor.  
Will it build and run on the armhf? Or am I the designated lab rat?

Thank you.

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 

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Re: [Emc-users] More questions for the 3d 'spurts

On Thursday 12 November 2020 16:39:19 Gregg Eshelman via Emc-users wrote:

> A Google for get dimensions from stl file shows there's many ways to
> do that. On Thursday, November 12, 2020, 11:35:23 AM MST, Gene Heskett
>  wrote:
>
>  On Thursday 12 November 2020 12:38:19 John Dammeyer wrote:
> > Mill it out of aluminium.  Counter bores for the screws.  Total time
> > spent will be way less than 3D printing it.  There are places for 3D
> > printing.  I use it all the time.  But it's easy to get into that
> > place where when you have a hammer everything looks like a nail.
> > John
>
> How do I make that .stl into gcode to drive one of my mills? Do we
> have such a critter?
>
> And I expect to have a similar problem with the full sized lid. The
> other half of that same bearing is half buried it it, same problem.
>
> I'll have to print both and take measurements to write the gcode I
> guess since the .stl doesn't AFAIK have a size, that is up to the
> printer. I've 1/8" plate I can make both parts out of.

But at 93% done its already 6.6mm thick, looks like I'll have to waste 
quite a bit of 1/2" plate, 1/4" won't quite do it. One of Jackie 
Gleason's "revoltin developments". But, I do have the 1/2" plate. I'd 
shrink it to 1/4", but don't have any of that.

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 


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Re: [Emc-users] Named subroutines

On Thursday 12 November 2020 17:42:44 Ralph Stirling wrote:

> I was reading the docs on remapping, and got to
> wondering if the o call syntax
> discussed in:
> http://linuxcnc.org/docs/html/remap/remap.html
> could be used directly in G-code programs.  I would
> really rather put:
>
> o call 1 2 3
>
Sure, works fine, but you might want to specify a subdir in your nc_files 
as the (check the docs) SUBROUTINE_PATH in the .ini file so subs won't 
confuse things.

Put it in the [RS274NGC] section like this:
[RS274NGC]
DISABLE_G92_PERSISTENSE = 0
PARAMETER_FILE  = linuxcnc.var
SUBROUTINE_PATH=/home/gene/linuxcnc/configs/GO704-5i25-7i76/ncam/lib/:/home/gene/nativecam/:/home/gene/linuxcnc/nc_files/subs/

> in my program than remap M100 to make that call,
> and then put:
>
> M100 A1 B2 C3
>
> in my program.
>
> Should this be possible?
>
> Thanks,
> -- Ralph
>
> ___
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Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 


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Re: [Emc-users] More questions for the 3d 'spurts

2020-11-12 Thread Andy Pugh



> On 13 Nov 2020, at 00:47, Gene Heskett  wrote:
> 
> Will it build and run on the armhf? Or am I the designated lab rat?

It’s Python. It should run just about anywhere. I used to run it in my Mac. 

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Re: [Emc-users] driver for a DC motor for a BS-1.

2020-11-12 Thread Dave Cole


Gene,

Where did you buy that H bridge board ?  Ebay ?

Dave

On 11/9/2020 5:15 PM, Gene Heskett wrote:

On Wednesday 28 October 2020 16:02:51 Gene Heskett wrote:


On Wednesday 28 October 2020 14:30:39 Chris Albertson wrote:

I bit of information from Polulu's web site.  They say..

"*While VNH3SP30’s over-voltage shutoff doesn’t activate until 36 V,
in our experience, shoot-through currents make PWM operation
impractical above 16 V.*"

Which pretty well explains my problems.

Its taken way too long, but I may have found the driver I need. Miniature
board and heat sink for about $13/copy.  Has a pair of Infineon BTS7960B
chips on a pcb about 1.5" square, rated for up to 45 volts and 43 amps
for each chip and 2 make a full H-bridge. From the looks, its not the
datasheet hookup, but has a 74HCT244 in tsop style for an input buffer.
Looks like it needs a ground and 5 volts, and probably an enable input,
and up and down pwms, mode 2 IOW. Needless to say, no example hookups
are to be had. But I'm prowling around in googles output now.  Found
them:



Interestingly, this one is stated to only be good till 27 volts, not the
infineon 45 volts. Bridge chips are labeled with an extra B.  2nd grade
stuffs? Probably. I'll advise how it works when I get it wired up.

Cheers, Gene Heskett



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Re: [Emc-users] More questions for the 3d 'spurts

Python is an interpreted language.  You don't "build" it.  It should run on
any computer that has a python interpreter.   But be warned, pycam can eat
up a lot of CPU cycles so you'd want to run it on whichever computer is the
fastest.  I hope your fastest computer is not a Pi4.  But it should work.

Python is notorious for dependencies. so if any libraries are used you have
to track those down and if they use any get those and so on.   You don't
really find these dependencies until you try to run the software.

On Thu, Nov 12, 2020 at 4:47 PM Gene Heskett  wrote:

> On Thursday 12 November 2020 15:38:04 andy pugh wrote:
>
>
> But the next Q is for Seb K. I just moved a copy of pycam-master.zip I
> just downloaded (which doesn't seem to be in debian later than wheezy)
> to the rpi4, running the raspian version of buster in armhf flavor.
> Will it build and run on the armhf? Or am I the designated lab rat?
>
-- 

Chris Albertson
Redondo Beach, California

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Re: [Emc-users] Named subroutines

2020-11-12 Thread Ralph Stirling

Ok, I'm glad to know it is an intended feature,
if undocumented.  I did find a brief discussion
on the forum from a decade ago, but it would
be nice to get it into the current docs.

https://forum.linuxcnc.org/20-g-code/3121-o-words-to-open-files

My other problem was a simple typo in the
PROGRAM_PREFIX line in my ini file, so it wasn't
looking for my o-word sub files.  I'm good now.

Thanks again!
-- Ralph

From: andy pugh [bodge...@gmail.com]
Sent: Thursday, November 12, 2020 4:38 PM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Named subroutines

CAUTION: This email originated from outside the Walla Walla University email 
system.

On Fri, 13 Nov 2020 at 00:19, Ralph Stirling
 wrote:
>
> I was reading the docs on remapping, and got to
> wondering if the o call syntax
> discussed in:
> https://nam05.safelinks.protection.outlook.com/?url=http%3A%2F%2Flinuxcnc.org%2Fdocs%2Fhtml%2Fremap%2Fremap.html&data=04%7C01%7Cralph.stirling%40wallawalla.edu%7Caafaf181e38e4bb409a708d8876c8e57%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C1%7C637408247616971827%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=40aWwtcAw1nWr0WquyIRih5M3K5BXfk0iCdyGtx6CaU%3D&reserved=0
> could be used directly in G-code programs.

Yes. Though oddly the docs don't mention it in the subroutine section.
https://nam05.safelinks.protection.outlook.com/?url=http%3A%2F%2Flinuxcnc.org%2Fdocs%2Fhtml%2Fgcode%2Fo-code.html%23ocode%3Asubroutines&data=04%7C01%7Cralph.stirling%40wallawalla.edu%7Caafaf181e38e4bb409a708d8876c8e57%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C1%7C637408247616971827%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=BuyqxIam8upcHdVtWNd6I9YXfcha37PY5hwxaUp0%2Bcc%3D&reserved=0

I tested with:

O SUB
(DEBUG, #1)
O ENDSUB

O CALL [22]
M2

--
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912

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Re: [Emc-users] driver for a DC motor for a BS-1.

I always suggest that people buy stuff the first few times from a
supplier who can offer technical support or at least technical documents
and one who is at least on the same continent as you.

These guys are the best.  Notice they have three tables for low, medium,
and high power drivers.  And if you drill down you get spec sheets, CAD
drawings, and sample code to operate them.
https://www.pololu.com/category/11/brushed-dc-motor-drivers
Read all the How-To about the product before you order as many times they
have suggestions, not on the data sheets

eBay is good after you have enough experience not to need technical details
and you can just figure out how to use whatever they send you.

On Thu, Nov 12, 2020 at 5:50 PM Dave Cole  wrote:

> Gene,
>
> Where did you buy that H bridge board ?  Ebay ?
>
> Dave
>
> On 11/9/2020 5:15 PM, Gene Heskett wrote:
> > On Wednesday 28 October 2020 16:02:51 Gene Heskett wrote:
> >
> >> On Wednesday 28 October 2020 14:30:39 Chris Albertson wrote:
> >>> I bit of information from Polulu's web site.  They say..
> >>>
> >>> "*While VNH3SP30’s over-voltage shutoff doesn’t activate until 36 V,
> >>> in our experience, shoot-through currents make PWM operation
> >>> impractical above 16 V.*"
> >> Which pretty well explains my problems.
> > Its taken way too long, but I may have found the driver I need. Miniature
> > board and heat sink for about $13/copy.  Has a pair of Infineon BTS7960B
> > chips on a pcb about 1.5" square, rated for up to 45 volts and 43 amps
> > for each chip and 2 make a full H-bridge. From the looks, its not the
> > datasheet hookup, but has a 74HCT244 in tsop style for an input buffer.
> > Looks like it needs a ground and 5 volts, and probably an enable input,
> > and up and down pwms, mode 2 IOW. Needless to say, no example hookups
> > are to be had. But I'm prowling around in googles output now.  Found
> > them:
> >
> > <
> https://www.handsontec.com/dataspecs/module/BTS7960%20Motor%20Driver.pdf>
> >
> > Interestingly, this one is stated to only be good till 27 volts, not the
> > infineon 45 volts. Bridge chips are labeled with an extra B.  2nd grade
> > stuffs? Probably. I'll advise how it works when I get it wired up.
> >
> > Cheers, Gene Heskett
>
>
> ___
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>


-- 

Chris Albertson
Redondo Beach, California

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Re: [Emc-users] Named subroutines

2020-11-12 Thread ken.strauss

In a program or even from the MDI. I use the capability to do probing.

-Original Message-
From: Ralph Stirling  
Sent: November 12, 2020 5:43 PM
To: emc-users@lists.sourceforge.net
Subject: [Emc-users] Named subroutines

I was reading the docs on remapping, and got to wondering if the
o call syntax discussed in: 
http://linuxcnc.org/docs/html/remap/remap.html
could be used directly in G-code programs.  I would really rather put:

o call 1 2 3

in my program than remap M100 to make that call, and then put:

M100 A1 B2 C3

in my program.

Should this be possible?

Thanks,
-- Ralph

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Re: [Emc-users] driver for a DC motor for a BS-1.