Re: [Emc-users] Cast Bracket for FHA-25 Harmonic Actuator.

[Gene Heskett]

On Tuesday 04 April 2017 02:51:22 Gregg Eshelman wrote:

> I wonder if they've heard about lost PLA casting? One off and short
> runs without needing to make expensive, reusable patterns, plus the
> ability to do casting shapes impossible with patterns that must be
> removable from a sand mold, could be a money maker for the foundry.
> 'Course they'd have to get and learn to use a 3D printing setup.

That looks like something I could do, if I had a big enough printer and 
could learn how to do the 3d model to feed the slicer software for the 
printer. I'm thinking of the belt guards in particular which would need 
at least one dimension in the 250mm by 100 by 100 range.

Can we slice and print from a sketchup file, or do I had to learn 
freecad?

Looking at the relative cost of the string vs the pellet fed printing 
head, pellet is 5% of the string on a cost per pound basis.  One belt 
guard out of pellets would pay for the diff in print heads, and I can 
think of several things hacked up out of 1/2" alu plate now that would 
look better if cast, but would probably be plenty functional in one of 
the higher temp plastics, like timeing belt guards. Z is fairly well out 
of the way, and I'll have a keyboard/mouse  house/shelf above it, but x 
is right in the flying swarf path.  Don't like the plastics color?  
Paint it.

And I am fairly familiar with iron casting, having spent much of a summer 
setting and pouring the molds I set at the end of my shift in an iron 
foundry in Perry Iowa. But then I was in my mid 20's, ten foot tall and 
bulletproof enough to handle an 80 lb bucket of iron on the far end of a 
6 foot handle.  Today I'd be hurting whats left of my back with 5 lbs of 
iron in a clay lined and lipped small bucket. That summer hurt my back 
and its never fully recovered.

> On Monday, April 3, 2017, 5:17:33 AM MDT, Gene Heskett
>  wrote: We have a foundry here, but no clue what
> sort of a 3d file they might accept. Or what they might have as an NRE
> price policy. Currently their main contract is for wheel hubs for 20"
> and 24" White Truck wheels. White being one of our smaller truck
> makers in terms of the overall market for "large cars" here in the US.
> So I'd expect the NRE stuff may be farmed out, and the finished form
> shipped back for pouring and final machining.
>
> Cheers, Gene Heskett
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Cheers, Gene Heskett
-- 
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 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

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Re: [Emc-users] Cast Bracket for FHA-25 Harmonic Actuator.

[andy pugh]

On 4 April 2017 at 07:51, Gregg Eshelman  wrote:
> I wonder if they've heard about lost PLA casting?

This is a 13kg casting in iron, that would be 2kg of PLA, about £40.
Though i guess you would use a low fill density, so it wouldn't be
quite that much.
But it would be many hours of extrusion time.

There again, I had about 20 hours of machine time to make the solid pattern:
https://goo.gl/photos/64p9cNWnEamwxUzz5

-- 
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, 1916

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Re: [Emc-users] Cast Bracket for FHA-25 Harmonic Actuator.

[Gene Heskett]

On Tuesday 04 April 2017 05:21:10 andy pugh wrote:

> On 4 April 2017 at 07:51, Gregg Eshelman  wrote:
> > I wonder if they've heard about lost PLA casting?
>
> This is a 13kg casting in iron, that would be 2kg of PLA, about £40.
> Though i guess you would use a low fill density, so it wouldn't be
> quite that much.
> But it would be many hours of extrusion time.
>
> There again, I had about 20 hours of machine time to make the solid
> pattern: https://goo.gl/photos/64p9cNWnEamwxUzz5

Humm, I think you'll need a bigger vacuum than what I see sitting 
there. :)  What sort of materiel is that?

Thanks Andy.

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)
Genes Web page 

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Re: [Emc-users] Cast Bracket for FHA-25 Harmonic Actuator.

[Andrew]

2017-04-04 12:21 GMT+03:00 andy pugh :

> This is a 13kg casting in iron, that would be 2kg of PLA, about £40.
> Though i guess you would use a low fill density, so it wouldn't be
> quite that much.
> But it would be many hours of extrusion time.
>

I exported the model to STL and feed it to a slicer.
It shows ~0,5kg and ~8hrs printing time with 0,45mm layer and 10% infill
density (with a Volcano hotend, which performs twice faster than usual).
And that's not a completely hollow part http://i63.tinypic.com/4t8z5u.png
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Re: [Emc-users] Cast Bracket for FHA-25 Harmonic Actuator.

[Erik Christiansen]

On 04.04.17 05:00, Gene Heskett wrote:
> On Tuesday 04 April 2017 02:51:22 Gregg Eshelman wrote:
> 
> > I wonder if they've heard about lost PLA casting? One off and short
> > runs without needing to make expensive, reusable patterns, plus the
> > ability to do casting shapes impossible with patterns that must be
> > removable from a sand mold, could be a money maker for the foundry.
> > 'Course they'd have to get and learn to use a 3D printing setup.
> 
> That looks like something I could do, if I had a big enough printer and 
> could learn how to do the 3d model to feed the slicer software for the 
> printer. I'm thinking of the belt guards in particular which would need 
> at least one dimension in the 250mm by 100 by 100 range.

Much much easier (and faster) for a relatively simple L-shaped angle
bracket with webs is lost polystyrene foam. For best finish, a hot-wire
cutter is a quite simple tool to make and use. (For the big central
cut-out, scribe the circle in pen, or pin on a cardboard template, and
cut radially to that circumference. Once around, exit by the same radial
cut. A little PVA glue seals that up again.) The foot of the L, and
webs, are similarly attached with a little PVA glue.

In extremis, lacking a hot-wire cutter, the only slicers needed are a
pointy breadknife to hack out the hole in the middle, and a sharp box
knife or similar to slice out the rectangle, triangles, and external
radius. Cold cutting works better (finish-wise) on that fine blue
"Styrofoam", sold by Dow as "Blue Ribbon Insulation Boards" or
"Wallmate".

Do you have any offcuts remaining from lining the garage door, Gene?
You could have the pattern done in a day - for nix.

Erik


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Re: [Emc-users] Cast Bracket for FHA-25 Harmonic Actuator.

[andy pugh]

On 3 April 2017 at 18:13, Gene Heskett  wrote:
> We have a foundry here, but no clue what sort of a 3d file they might
> accept. Or what they might have as an NRE price policy

This foundry appears happy to do investment casting from a solid model
http://www.wisconsinprecision.com/file-types-accepted.php

-- 
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, 1916

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Re: [Emc-users] Cast Bracket for FHA-25 Harmonic Actuator.

[Gregg Eshelman]

3D printing needs STL format. Any 3D modeling or CAD software that can output 
STL can be made to work as a source for this. One thing though, all the 3D 
slicer software assumes you're working in millimeters.
That's due to the original scanning laser and vat of resin 3D printers only 
being able to do tiny things, and the guys who created the STL format never 
thought about anyone ever wanting to use such giant units as centimeters, let 
alone inches.

I use Caligari trueSpace 6.6. I can work in millimeters or meters and the 
resulting print is exactly the same size. If I try any other units, it does not 
print the right size.

On Monday, April 3, 2017, 9:10:07 PM MDT, Gene Heskett  
wrote:On Tuesday 04 April 2017 02:51:22 Gregg Eshelman wrote:

> I wonder if they've heard about lost PLA casting? One off and short
> runs without needing to make expensive, reusable patterns, plus the
> ability to do casting shapes impossible with patterns that must be
> removable from a sand mold, could be a money maker for the foundry.
> 'Course they'd have to get and learn to use a 3D printing setup.

That looks like something I could do, if I had a big enough printer and 
could learn how to do the 3d model to feed the slicer software for the 
printer. I'm thinking of the belt guards in particular which would need 
at least one dimension in the 250mm by 100 by 100 range.

Can we slice and print from a sketchup file, or do I had to learn 
freecad?
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Re: [Emc-users] Cast Bracket for FHA-25 Harmonic Actuator.

[andy pugh]

On 4 April 2017 at 10:46, Gene Heskett  wrote:
>> There again, I had about 20 hours of machine time to make the solid
>> pattern: https://goo.gl/photos/64p9cNWnEamwxUzz5
>
> Humm, I think you'll need a bigger vacuum than what I see sitting
> there. :)  What sort of materiel is that?

It is actually Sikablock 950. Which is sold for making prototype press tooling:
(And, in fact, my source is a broken press tool from work).
https://www.youtube.com/watch?v=1qc5gZE_XUg

-- 
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, 1916

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Re: [Emc-users] Cast Bracket for FHA-25 Harmonic Actuator.

[andy pugh]

On 4 April 2017 at 10:47, Andrew  wrote:
> I exported the model to STL and feed it to a slicer.
> It shows ~0,5kg and ~8hrs printing time with 0,45mm layer and 10% infill


But that is 8 hours per part (if using lost-PLA) whereas my
conventional pattern can be re-used.

This thread seems to have drifted badly. I have made a pattern, the
pattern is at the foundry.
My question was how many parts I should have made. It would make
little sense for anyone to use my design file rather than one
optimised for their requirements, there is about 45 minutes of work in
that model, irrelevant compared to printing, machining or
pattern-making time.

If you are interested in conventional pattern-making, then I have some
friends who restore old vehicles and so a lot of it:
http://hmvf.co.uk/forumvb/showthread.php?13514-WW1-Thornycroft-restoration&p=486322#post486322
For example.

-- 
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, 1916

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Re: [Emc-users] Cast Bracket for FHA-25 Harmonic Actuator.

[Gregg Eshelman]

You'd use a very low fill density, no fill if the pattern can be done that way. 
Better slicers now have a variable density fill capability along with variable 
layer height.Another benefit of 3D printing PLA for single use casting patterns 
is they can be much closer to net shape, which will reduce machining time a lot.
An extra nifty thing with the process is the same 3D model can be used for 
plaster coated lost wax process, where the PLA is burned out the same way, and 
for one part sand mold casting, same as the lost foam process that buries 
molded pieces of styrofoam in the sand.

On Monday, April 3, 2017, 9:28:43 PM MDT, andy pugh  
wrote:On 4 April 2017 at 07:51, Gregg Eshelman  wrote:
> I wonder if they've heard about lost PLA casting?

This is a 13kg casting in iron, that would be 2kg of PLA, about £40.
Though i guess you would use a low fill density, so it wouldn't be
quite that much.
But it would be many hours of extrusion time.

There again, I had about 20 hours of machine time to make the solid pattern:
https://goo.gl/photos/64p9cNWnEamwxUzz5
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Re: [Emc-users] Cast Bracket for FHA-25 Harmonic Actuator.

[Erik Christiansen]

On 04.04.17 10:21, andy pugh wrote:
> On 4 April 2017 at 07:51, Gregg Eshelman  wrote:
> > I wonder if they've heard about lost PLA casting?
> 
> This is a 13kg casting in iron, that would be 2kg of PLA, about £40.
> Though i guess you would use a low fill density, so it wouldn't be
> quite that much.

+1

The reason that lost foam works well is the large amount of air and
small amount of plastic. The gush of flame from the riser(s) is limited,
at least on smaller castings, resistance to metal flow is negligible,
and heat loss to plastic fusion is minimal.

To replicate that, I figure that 3D printing would have to print a thin
solid skin to exclude the mould sand, and a very open internal weave,
sufficient to support the external walls, but minimising the height of
the flames at the vents, as well as the obstruction to metal flow.
(The last is doubtless a bit less critical with CI than Al, so long as
the risers and vents can vent the gas pressure, to avoid molten metal
erupting back out while pouring.)

A mould cavity filled with 2 kg of solid plastic fuel does not bear
contemplation. If the printed volume were as much as 10% plastic, I'd
experiment with a quite small one first - for the purpose of surviving
the experience.

Erik

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Re: [Emc-users] Cast Bracket for FHA-25 Harmonic Actuator.

[Mark]

On 04/03/2017 02:24 PM, andy pugh wrote:
> On 3 April 2017 at 18:13, Gene Heskett  wrote:
>> link crashes firefox.  Expected?
> On your computer? Yes.
>
Andy,


You owe me a new keyboard for that one.  ;-)


Mark


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Re: [Emc-users] Cast Bracket for FHA-25 Harmonic Actuator.

[Gene Heskett]

On Tuesday 04 April 2017 06:04:50 Erik Christiansen wrote:

> On 04.04.17 05:00, Gene Heskett wrote:
> > On Tuesday 04 April 2017 02:51:22 Gregg Eshelman wrote:
> > > I wonder if they've heard about lost PLA casting? One off and
> > > short runs without needing to make expensive, reusable patterns,
> > > plus the ability to do casting shapes impossible with patterns
> > > that must be removable from a sand mold, could be a money maker
> > > for the foundry. 'Course they'd have to get and learn to use a 3D
> > > printing setup.
> >
> > That looks like something I could do, if I had a big enough printer
> > and could learn how to do the 3d model to feed the slicer software
> > for the printer. I'm thinking of the belt guards in particular which
> > would need at least one dimension in the 250mm by 100 by 100 range.
>
> Much much easier (and faster) for a relatively simple L-shaped angle
> bracket with webs is lost polystyrene foam. For best finish, a
> hot-wire cutter is a quite simple tool to make and use. (For the big
> central cut-out, scribe the circle in pen, or pin on a cardboard
> template, and cut radially to that circumference. Once around, exit by
> the same radial cut. A little PVA glue seals that up again.) The foot
> of the L, and webs, are similarly attached with a little PVA glue.
>
> In extremis, lacking a hot-wire cutter, the only slicers needed are a
> pointy breadknife to hack out the hole in the middle, and a sharp box
> knife or similar to slice out the rectangle, triangles, and external
> radius. Cold cutting works better (finish-wise) on that fine blue
> "Styrofoam", sold by Dow as "Blue Ribbon Insulation Boards" or
> "Wallmate".
>
> Do you have any offcuts remaining from lining the garage door, Gene?
> You could have the pattern done in a day - for nix.
>
> Erik
>
Those scraps of that blueish foam have all been binned or used years ago. 
And Lowes no longer carries that same board in 2" R22 thickness. The 
current product the last time I looked is a white, larger cell product 
and only about R20 because of that, but its the same $35 & tax a 4x8 
foot sheet.  How it would cut with a hot wire would be TBD.

The composition SW you folks use is I assume OpenScad? I started to do a 
belt cover with librecad, and had made good progress with a wire outline 
of unk dimensions but found its 2d only when I went looking for an 
extrude function.  Dropped that, installed openscad, but the only place 
I can find docs is at wikibooks. Without downloading both books from 
there, I've no clue how many pages of dead tree that would be.

librecad apparently does not have any docs, there are none in the 
installed librecad, and clicking of the help button gets an oh fudge, I 
can't find the docs message. Theres not a separate docs package in the 
repo's for wheezy. But its pretty intuitive to draw outlines and such.

So openscad seems to be it if I make a full 3d model, mounting tabs and 
all. Its help docs buttons go straight to wikibooks.

How hot does the hot wire need to be? Seeing as how thats best jiggered 
up as a wire support frame I could stick in a vise on the g0704's table 
and rig some sort of a sheet gripper leaving a cutaway, for the hot wire 
to move within, attached to the chip pan, if I get it rigid enough to 
keep its place as the wire moves, I could probably just write gcode to 
drive the cutters path. Where it needs a lid like the outside face of a 
belt cover, just cut the outline out and glue it on.

But, I think buying the printer would get me a nicer looking belt cover.

Have any of you bought an open frame big enough to use, then built an 
insulating box to make it run smoother and faster? Best deal for the 
dollar but with a pellet fed head, that and working envelope big enough 
for a 10x5x4 length.width,height, or 250x125x100 in mm's.

Throw some brand names I can google for at me please. 
>
> --
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> most engaging tech sites, Slashdot.org! http://sdm.link/slashdot
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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)
Genes Web page 

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Re: [Emc-users] Cast Bracket for FHA-25 Harmonic Actuator.

[Ralph Stirling]

I believe you can use SketchUp for generating STL files
for 3d printing.  Pretty much any 3d cad tool in existence
can do so.  Librecad is only 2d, so not much use.  On Linux,
you are pretty well limited to Openscad and Freecad.

-- Ralph

From: Gene Heskett [ghesk...@shentel.net]
Sent: Tuesday, April 4, 2017 9:29 AM
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] Cast Bracket for FHA-25 Harmonic Actuator.

On Tuesday 04 April 2017 06:04:50 Erik Christiansen wrote:

> On 04.04.17 05:00, Gene Heskett wrote:
> > On Tuesday 04 April 2017 02:51:22 Gregg Eshelman wrote:
> > > I wonder if they've heard about lost PLA casting? One off and
> > > short runs without needing to make expensive, reusable patterns,
> > > plus the ability to do casting shapes impossible with patterns
> > > that must be removable from a sand mold, could be a money maker
> > > for the foundry. 'Course they'd have to get and learn to use a 3D
> > > printing setup.
> >
> > That looks like something I could do, if I had a big enough printer
> > and could learn how to do the 3d model to feed the slicer software
> > for the printer. I'm thinking of the belt guards in particular which
> > would need at least one dimension in the 250mm by 100 by 100 range.
>
> Much much easier (and faster) for a relatively simple L-shaped angle
> bracket with webs is lost polystyrene foam. For best finish, a
> hot-wire cutter is a quite simple tool to make and use. (For the big
> central cut-out, scribe the circle in pen, or pin on a cardboard
> template, and cut radially to that circumference. Once around, exit by
> the same radial cut. A little PVA glue seals that up again.) The foot
> of the L, and webs, are similarly attached with a little PVA glue.
>
> In extremis, lacking a hot-wire cutter, the only slicers needed are a
> pointy breadknife to hack out the hole in the middle, and a sharp box
> knife or similar to slice out the rectangle, triangles, and external
> radius. Cold cutting works better (finish-wise) on that fine blue
> "Styrofoam", sold by Dow as "Blue Ribbon Insulation Boards" or
> "Wallmate".
>
> Do you have any offcuts remaining from lining the garage door, Gene?
> You could have the pattern done in a day - for nix.
>
> Erik
>
Those scraps of that blueish foam have all been binned or used years ago.
And Lowes no longer carries that same board in 2" R22 thickness. The
current product the last time I looked is a white, larger cell product
and only about R20 because of that, but its the same $35 & tax a 4x8
foot sheet.  How it would cut with a hot wire would be TBD.

The composition SW you folks use is I assume OpenScad? I started to do a
belt cover with librecad, and had made good progress with a wire outline
of unk dimensions but found its 2d only when I went looking for an
extrude function.  Dropped that, installed openscad, but the only place
I can find docs is at wikibooks. Without downloading both books from
there, I've no clue how many pages of dead tree that would be.

librecad apparently does not have any docs, there are none in the
installed librecad, and clicking of the help button gets an oh fudge, I
can't find the docs message. Theres not a separate docs package in the
repo's for wheezy. But its pretty intuitive to draw outlines and such.

So openscad seems to be it if I make a full 3d model, mounting tabs and
all. Its help docs buttons go straight to wikibooks.

How hot does the hot wire need to be? Seeing as how thats best jiggered
up as a wire support frame I could stick in a vise on the g0704's table
and rig some sort of a sheet gripper leaving a cutaway, for the hot wire
to move within, attached to the chip pan, if I get it rigid enough to
keep its place as the wire moves, I could probably just write gcode to
drive the cutters path. Where it needs a lid like the outside face of a
belt cover, just cut the outline out and glue it on.

But, I think buying the printer would get me a nicer looking belt cover.

Have any of you bought an open frame big enough to use, then built an
insulating box to make it run smoother and faster? Best deal for the
dollar but with a pellet fed head, that and working envelope big enough
for a 10x5x4 length.width,height, or 250x125x100 in mm's.

Throw some brand names I can google for at me please.
>
> --
> Check out the vibrant tech community on one of the world's
> most engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> ___
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> 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)
Genes Web page 

[Emc-users] Missing Documentation - I think

[Joe Hildreth]

Hello all, 

I am looking through the docs and cannot find a man page for the 
hal_manualtoolchange userspace component, and only see reference to it in the 
HAL Examples section of the doc. Also missing is the man page for the parport 
rt module. Who do I need to request for these docs, or is it worth the time? 

Thanks for putting up with me folks! :-) 

Joe 

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[Emc-users] Servo Motor Retrofit sizing

[robert - Innovative-RC]

Hi

i am planning to retrofit a machine i will change the servo motors as 
current ones are faulty etc
anyways i know the motor ratings on the machine right now as follows

Yaskawa USAFED-30FS20E
Rated 18.6Nm
Continuou Max 22.5Nm
Peak max 54.1Nm
Rated Speed 1500rpm
Max Speed 2000rpm
Torque Constant 0.98Nm/A
Moment of Inertia jm(=GD2/4) 110.0kg.m2x10-4
Power 2.9Kw

now the servo i was looking at replacing with has the same torques but a 
lower Inertia Jm value. what effects does this have on the 
accell/deaccel , i know motor it self takes less toque to accel its 
self.. but how does this related back to the load wanting to carry on 
moving when trying to deaccel it, what are the the realworld or other 
impacts on the motor/drive , am i more likly to see higher bus 
voltage/regen problems from the motor loading, as this motor is on a Z 
axis and has no counter balance so the motor is braked for parking...
motor runs at 1500rpm, screw is 10mm pitch i am not looking to go any 
faster just keep things the same ratings etc

motor i was looking at replacing with is, as torque match's,
Rated 19.1Nm
Peak  57.3Nm
Rated Speed 1000rpm
max speed 1500rpm
Rotor Moment of Inertia 53.5kg.m2x10-4
Power 2.0Kw

or i go the next motor up
Rated 28.7Nm
Peak  86.0Nm
Rated Speed 1000rpm
max speed 1500rpm
Rotor Moment of Inertia 77.8kg.m2x10-4
Power 3.0Kw

maybe someone here can add some insight into what to watch out for when 
resizing/replacing servos in CNC systems etc

just when you look up about servo sizing alot talk about the inertia 
ratio etc..

thanks, Rob


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Re: [Emc-users] Missing Documentation - I think

[Joe Hildreth]

Looking at the ha;_manualtoolchange.py file, I see the following:

h = hal.component("hal_manualtoolchange")
h.newpin("number", hal.HAL_S32, hal.HAL_IN)
h.newpin("change", hal.HAL_BIT, hal.HAL_IN)
h.newpin("change_button", hal.HAL_BIT, hal.HAL_IN)
h.newpin("changed", hal.HAL_BIT, hal.HAL_OUT)
h.ready()

So this tells me what pins are created, the only one I am unsure of is the 
change_button, can someone explain this one?

I know this seems petty, but I am trying to wrap my head around it enough so I 
can teach a few high schoolers what is going on.  Or maybe a little glimpse of 
how the parts fit and work together.  Before I can do that, I need to teach 
myself.

My impression is the hal_manualtoolchange component does the following:

a) receives the tool number via hal_manualtoolchange.number pin
b) receives a command to change the tool via hal_manualtoolchange.change pin
c) The component then opens the dialog informing the user to change to tool #X
d) User does the tool change and clicks the okay button.
e) the okay button send signal via hal_manualtoolchange.changed

am I close?  

Joe

- On Apr 4, 2017, at 1:56 PM, Joe Hildreth j...@threerivershospital.com 
wrote:

> Hello all,
> 
> I am looking through the docs and cannot find a man page for the
> hal_manualtoolchange userspace component, and only see reference to it in the
> HAL Examples section of the doc. Also missing is the man page for the parport
> rt module. Who do I need to request for these docs, or is it worth the time?
> 
> Thanks for putting up with me folks! :-)
> 
> Joe
> 
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Re: [Emc-users] Missing Documentation - I think

[Sebastian Kuzminsky]

On 04/04/2017 01:13 PM, Joe Hildreth wrote:
> Looking at the ha;_manualtoolchange.py file, I see the following:
>
> h = hal.component("hal_manualtoolchange")
> h.newpin("number", hal.HAL_S32, hal.HAL_IN)
> h.newpin("change", hal.HAL_BIT, hal.HAL_IN)
> h.newpin("change_button", hal.HAL_BIT, hal.HAL_IN)
> h.newpin("changed", hal.HAL_BIT, hal.HAL_OUT)
> h.ready()
>
> So this tells me what pins are created, the only one I am unsure of is the 
> change_button, can someone explain this one?
>
> I know this seems petty, but I am trying to wrap my head around it enough so 
> I can teach a few high schoolers what is going on.  Or maybe a little glimpse 
> of how the parts fit and work together.  Before I can do that, I need to 
> teach myself.
>
> My impression is the hal_manualtoolchange component does the following:
>
> a) receives the tool number via hal_manualtoolchange.number pin
> b) receives a command to change the tool via hal_manualtoolchange.change pin
> c) The component then opens the dialog informing the user to change to tool #X
> d) User does the tool change and clicks the okay button.
> e) the okay button send signal via hal_manualtoolchange.changed
>
> am I close?

You're exactly correct, that's what hal_manualtoolchange does.

The M6 g-code triggers the tool change operation, and blocks until 
hal_manualtoolchange asserts the .changed pin.


You're also right that we don't have a manpage for that component. 
Since you know it so well now, why not try writing one?  It's easy and 
fun!  ;-)

Take a look at docs/src/man/man1/halstreamer.txt for inspiration.

Some docs on how to check out and modify LinuxCNC and how to contribute 
the changes back to the community can be found here:

http://linuxcnc.org/docs/devel/html/code/building-linuxcnc.html
http://linuxcnc.org/docs/devel/html/code/contributing-to-linuxcnc.html


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Re: [Emc-users] Missing Documentation - I think

[Joe Hildreth]

Sebastian,

I will be happy to try to write it.

Joe

- On Apr 4, 2017, at 2:34 PM, Sebastian Kuzminsky s...@highlab.com wrote:

> On 04/04/2017 01:13 PM, Joe Hildreth wrote:
>> Looking at the ha;_manualtoolchange.py file, I see the following:
>>
>> h = hal.component("hal_manualtoolchange")
>> h.newpin("number", hal.HAL_S32, hal.HAL_IN)
>> h.newpin("change", hal.HAL_BIT, hal.HAL_IN)
>> h.newpin("change_button", hal.HAL_BIT, hal.HAL_IN)
>> h.newpin("changed", hal.HAL_BIT, hal.HAL_OUT)
>> h.ready()
>>
>> So this tells me what pins are created, the only one I am unsure of is the
>> change_button, can someone explain this one?
>>
>> I know this seems petty, but I am trying to wrap my head around it enough so 
>> I
>> can teach a few high schoolers what is going on.  Or maybe a little glimpse 
>> of
>> how the parts fit and work together.  Before I can do that, I need to teach
>> myself.
>>
>> My impression is the hal_manualtoolchange component does the following:
>>
>> a) receives the tool number via hal_manualtoolchange.number pin
>> b) receives a command to change the tool via hal_manualtoolchange.change pin
>> c) The component then opens the dialog informing the user to change to tool 
>> #X
>> d) User does the tool change and clicks the okay button.
>> e) the okay button send signal via hal_manualtoolchange.changed
>>
>> am I close?
> 
> You're exactly correct, that's what hal_manualtoolchange does.
> 
> The M6 g-code triggers the tool change operation, and blocks until
> hal_manualtoolchange asserts the .changed pin.
> 
> 
> You're also right that we don't have a manpage for that component.
> Since you know it so well now, why not try writing one?  It's easy and
> fun!  ;-)
> 
> Take a look at docs/src/man/man1/halstreamer.txt for inspiration.
> 
> Some docs on how to check out and modify LinuxCNC and how to contribute
> the changes back to the community can be found here:
> 
> http://linuxcnc.org/docs/devel/html/code/building-linuxcnc.html
> http://linuxcnc.org/docs/devel/html/code/contributing-to-linuxcnc.html
> 
> 
> --
> Sebastian Kuzminsky
> 
> --
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Re: [Emc-users] Missing Documentation - I think

[Dewey Garrett]

> So this tells me what pins are created,
> the only one I am unsure of is the
> change_button, can someone explain this one?

By default, one must click the 'Continue'
button on the tool change popup gui to
acknowledge the manual tool change.

The pin 'hal_manualtoolchange.change_button'
may be connected through hal to a pin
wired to a physical hardware button to
allow acknowledgement by other means.  The
button could be part of a panel or pendant
for instance.

To demonstrate usage from the command line:

$ sim_pin: hal_manualtoolchange.change_button
-- 
Dewey Garrett


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Re: [Emc-users] Missing Documentation - I think

[andy pugh]

On 4 April 2017 at 19:56, Joe Hildreth  wrote:
> I am looking through the docs and cannot find a man page for the 
> hal_manualtoolchange userspace component,

It is hidden:
http://linuxcnc.org/docs/2.7/html/gui/axis.html#_manual_tool_change

-- 
atp
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lunatics."
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Re: [Emc-users] Missing Documentation - I think

[Joe Hildreth]

Thanks Dewey that helped a bunch.

- On Apr 4, 2017, at 4:42 PM, Dewey Garrett dgarr...@panix.com wrote:

>> So this tells me what pins are created,
>> the only one I am unsure of is the
>> change_button, can someone explain this one?
> 
> By default, one must click the 'Continue'
> button on the tool change popup gui to
> acknowledge the manual tool change.
> 
> The pin 'hal_manualtoolchange.change_button'
> may be connected through hal to a pin
> wired to a physical hardware button to
> allow acknowledgement by other means.  The
> button could be part of a panel or pendant
> for instance.
> 
> To demonstrate usage from the command line:
> 
> $ sim_pin: hal_manualtoolchange.change_button
> --
> Dewey Garrett

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Re: [Emc-users] Missing Documentation - I think

[Joe Hildreth]

DOH!

I guess I should have dug a little more.  Thanks Andy.

So would you guys still like me to tackle the man page for the component.  Been 
reading up on how to construct them, and I am willing to give it a go.

- On Apr 4, 2017, at 6:21 PM, andy pugh bodge...@gmail.com wrote:

> On 4 April 2017 at 19:56, Joe Hildreth  wrote:
>> I am looking through the docs and cannot find a man page for the
>> hal_manualtoolchange userspace component,
> 
> It is hidden:
> http://linuxcnc.org/docs/2.7/html/gui/axis.html#_manual_tool_change
> 
> --
> atp

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Re: [Emc-users] Missing Documentation - I think

[Sebastian Kuzminsky]

On 04/04/2017 05:54 PM, Joe Hildreth wrote:
> DOH!
>
> I guess I should have dug a little more.  Thanks Andy.
>
> So would you guys still like me to tackle the man page for the component.  
> Been reading up on how to construct them, and I am willing to give it a go.

It would be good to have a manpage for that component, but I think it's 
not urgent.  Your is the first request for information i remember seeing 
about it.

Writing manpages in roff is rough, but the halstreamer manpage i 
mentioned earlier is written in asciidoc, which is much simpler.


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Re: [Emc-users] Servo Motor Retrofit sizing

[Dave Cole]

Here is a discussion about inertial mismatch.

http://www.motioncontrolonline.org/content-detail.cfm/Motion-Control-Technical-Features/Understanding-the-Mysteries-of-Inertia-Mismatch/content_id/404

The Sizing software that Automation Direct has on their website can be 
used to check motor sizing for non-Automation Direct motors.

I have used it for years and it has never missed.

Run the calculations and see how well they matched your original motors. 
   That will give you an idea if you can get by with 1/2 of the original 
motor inertia.

Dave


On 4/4/2017 2:35 PM, robert - Innovative-RC wrote:
> Hi
>
> i am planning to retrofit a machine i will change the servo motors as
> current ones are faulty etc
> anyways i know the motor ratings on the machine right now as follows
>
> Yaskawa USAFED-30FS20E
> Rated 18.6Nm
> Continuou Max 22.5Nm
> Peak max 54.1Nm
> Rated Speed 1500rpm
> Max Speed 2000rpm
> Torque Constant 0.98Nm/A
> Moment of Inertia jm(=GD2/4) 110.0kg.m2x10-4
> Power 2.9Kw
>
> now the servo i was looking at replacing with has the same torques but a
> lower Inertia Jm value. what effects does this have on the
> accell/deaccel , i know motor it self takes less toque to accel its
> self.. but how does this related back to the load wanting to carry on
> moving when trying to deaccel it, what are the the realworld or other
> impacts on the motor/drive , am i more likly to see higher bus
> voltage/regen problems from the motor loading, as this motor is on a Z
> axis and has no counter balance so the motor is braked for parking...
> motor runs at 1500rpm, screw is 10mm pitch i am not looking to go any
> faster just keep things the same ratings etc
>
> motor i was looking at replacing with is, as torque match's,
> Rated 19.1Nm
> Peak  57.3Nm
> Rated Speed 1000rpm
> max speed 1500rpm
> Rotor Moment of Inertia 53.5kg.m2x10-4
> Power 2.0Kw
>
> or i go the next motor up
> Rated 28.7Nm
> Peak  86.0Nm
> Rated Speed 1000rpm
> max speed 1500rpm
> Rotor Moment of Inertia 77.8kg.m2x10-4
> Power 3.0Kw
>
> maybe someone here can add some insight into what to watch out for when
> resizing/replacing servos in CNC systems etc
>
> just when you look up about servo sizing alot talk about the inertia
> ratio etc..
>
> thanks, Rob
>
>
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Re: [Emc-users] Cast Bracket for FHA-25 Harmonic Actuator.

[Gene Heskett]

On Tuesday 04 April 2017 06:19:46 andy pugh wrote:

> On 4 April 2017 at 10:46, Gene Heskett  wrote:
> >> There again, I had about 20 hours of machine time to make the solid
> >> pattern: https://goo.gl/photos/64p9cNWnEamwxUzz5
> >
> > Humm, I think you'll need a bigger vacuum than what I see sitting
> > there. :)  What sort of materiel is that?
>
> It is actually Sikablock 950. Which is sold for making prototype press
> tooling: (And, in fact, my source is a broken press tool from work).
> https://www.youtube.com/watch?v=1qc5gZE_XUg

I looked at the video, and thats one tough bit of plastic! I presume it 
has a price tag to reflect its usefullness on the production line...
Thanks Andy.

Cheers, Gene Heskett
-- 
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 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

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Re: [Emc-users] Cast Bracket for FHA-25 Harmonic Actuator.

[Gene Heskett]

On Tuesday 04 April 2017 06:21:52 andy pugh wrote:

> On 3 April 2017 at 18:13, Gene Heskett  wrote:
> > We have a foundry here, but no clue what sort of a 3d file they
> > might accept. Or what they might have as an NRE price policy
>
> This foundry appears happy to do investment casting from a solid model
> http://www.wisconsinprecision.com/file-types-accepted.php

Interesting, in a bring little red wagonloads of money way. At this time 
I don't know enough to even ask for a "quick quote".

Thanks, Andy, bookmarked FFR.

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)
Genes Web page 

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Re: [Emc-users] Cast Bracket for FHA-25 Harmonic Actuator.

[Gene Heskett]

On Tuesday 04 April 2017 06:22:26 Gregg Eshelman wrote:

> 3D printing needs STL format. Any 3D modeling or CAD software that can
> output STL can be made to work as a source for this. One thing though,
> all the 3D slicer software assumes you're working in millimeters.
> That's due to the original scanning laser and vat of resin 3D printers
> only being able to do tiny things, and the guys who created the STL
> format never thought about anyone ever wanting to use such giant units
> as centimeters, let alone inches.
>
> I use Caligari trueSpace 6.6. I can work in millimeters or meters and
> the resulting print is exactly the same size. If I try any other
> units, it does not print the right size.
>
> On Monday, April 3, 2017, 9:10:07 PM MDT, Gene Heskett 
 wrote:On Tuesday 04 April 2017 02:51:22 Gregg 
Eshelman wrote:
> > I wonder if they've heard about lost PLA casting? One off and short
> > runs without needing to make expensive, reusable patterns, plus the
> > ability to do casting shapes impossible with patterns that must be
> > removable from a sand mold, could be a money maker for the foundry.
> > 'Course they'd have to get and learn to use a 3D printing setup.
>
> That looks like something I could do, if I had a big enough printer
> and could learn how to do the 3d model to feed the slicer software for
> the printer. I'm thinking of the belt guards in particular which would
> need at least one dimension in the 250mm by 100 by 100 range.
>
> Can we slice and print from a sketchup file, or do I had to learn
> freecad?

Looks like sketchup has gone commercial, I'd have to buy a license to 
make it usefull.  Back to Openscad I guess. It can export .stl's.  Or 
claims it can.

Thanks Gregg.

Cheers, Gene Heskett
-- 
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 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

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Re: [Emc-users] Cast Bracket for FHA-25 Harmonic Actuator.

[Ralph Stirling]

STL is about all you can get out of OpenSCAD.  However, FreeCAD
has a useful feature that lets you paste OpenSCAD text files and
generate solid objects in FreeCAD.  At that point all kinds of file
formats can be generated (to transfer to other cad systems).

OpenSCAD is a "programmer's 3d cad tool".  You create a description
of your part with a text editor and then "compile" it to generate your
part.  It is great for basic combinations of primitives, but does not
have support for things like fillets and chamfers without going to a
lot of trouble.  I like to quickly make my part in OpenSCAD, then
move that to FreeCAD where it is easy to apply things like fillets and
chamfers.

I just wish there was an open source CAM tool of equal sophistication
for CNC work...

-- Ralph

From: Gene Heskett [ghesk...@shentel.net]
Sent: Tuesday, April 4, 2017 7:21 PM
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] Cast Bracket for FHA-25 Harmonic Actuator.

On Tuesday 04 April 2017 06:22:26 Gregg Eshelman wrote:

> 3D printing needs STL format. Any 3D modeling or CAD software that can
> output STL can be made to work as a source for this. One thing though,
> all the 3D slicer software assumes you're working in millimeters.
> That's due to the original scanning laser and vat of resin 3D printers
> only being able to do tiny things, and the guys who created the STL
> format never thought about anyone ever wanting to use such giant units
> as centimeters, let alone inches.
>
> I use Caligari trueSpace 6.6. I can work in millimeters or meters and
> the resulting print is exactly the same size. If I try any other
> units, it does not print the right size.
>
> On Monday, April 3, 2017, 9:10:07 PM MDT, Gene Heskett
 wrote:On Tuesday 04 April 2017 02:51:22 Gregg
Eshelman wrote:
> > I wonder if they've heard about lost PLA casting? One off and short
> > runs without needing to make expensive, reusable patterns, plus the
> > ability to do casting shapes impossible with patterns that must be
> > removable from a sand mold, could be a money maker for the foundry.
> > 'Course they'd have to get and learn to use a 3D printing setup.
>
> That looks like something I could do, if I had a big enough printer
> and could learn how to do the 3d model to feed the slicer software for
> the printer. I'm thinking of the belt guards in particular which would
> need at least one dimension in the 250mm by 100 by 100 range.
>
> Can we slice and print from a sketchup file, or do I had to learn
> freecad?

Looks like sketchup has gone commercial, I'd have to buy a license to
make it usefull.  Back to Openscad I guess. It can export .stl's.  Or
claims it can.

Thanks Gregg.

Cheers, Gene Heskett
--
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 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

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Re: [Emc-users] Cast Bracket for FHA-25 Harmonic Actuator.

[Gene Heskett]

On Tuesday 04 April 2017 06:28:31 andy pugh wrote:

> On 4 April 2017 at 10:47, Andrew  wrote:
> > I exported the model to STL and feed it to a slicer.
> > It shows ~0,5kg and ~8hrs printing time with 0,45mm layer and 10%
> > infill
>
> But that is 8 hours per part (if using lost-PLA) whereas my
> conventional pattern can be re-used.
>
> This thread seems to have drifted badly. I have made a pattern, the
> pattern is at the foundry.
> My question was how many parts I should have made. It would make
> little sense for anyone to use my design file rather than one
> optimised for their requirements, there is about 45 minutes of work in
> that model, irrelevant compared to printing, machining or
> pattern-making time.
>
> If you are interested in conventional pattern-making, then I have some
> friends who restore old vehicles and so a lot of it:
> http://hmvf.co.uk/forumvb/showthread.php?13514-WW1-Thornycroft-restora
>tion&p=486322#post486322 For example.

Interesting, using a wooden mockup.  Nice work.  So that is a hint that 
if I print this cover, I should do 2 of them, 1 to put on the shelf for 
taking to the foundry if the best  of the 2 breaks, take the 2nd one to 
the foundry.

Thanks Andy.

Cheers, Gene Heskett
-- 
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 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

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Re: [Emc-users] Servo Motor Retrofit sizing

[Jon Elson]

On 04/04/2017 01:35 PM, robert - Innovative-RC wrote:
> Hi
>
> i am planning to retrofit a machine i will change the servo motors as
> current ones are faulty etc
> anyways i know the motor ratings on the machine right now as follows
>
> Yaskawa USAFED-30FS20E
> Rated 18.6Nm
> Continuou Max 22.5Nm
> Peak max 54.1Nm
> Rated Speed 1500rpm
> Max Speed 2000rpm
> Torque Constant 0.98Nm/A
> Moment of Inertia jm(=GD2/4) 110.0kg.m2x10-4
> Power 2.9Kw
>
> now the servo i was looking at replacing with has the same torques but a
> lower Inertia Jm value.
Somewhat lower inertia should be no problem.
>   what effects does this have on the
> accell/deaccel , i know motor it self takes less toque to accel its
> self.. but how does this related back to the load wanting to carry on
> moving when trying to deaccel it, what are the the realworld or other
> impacts on the motor/drive , am i more likly to see higher bus
> voltage/regen problems from the motor loading, as this motor is on a Z
> axis and has no counter balance so the motor is braked for parking...
> motor runs at 1500rpm, screw is 10mm pitch i am not looking to go any
> faster just keep things the same ratings etc
I would not worry about it except in VERY dynamic systems 
like routers moving over several meters/second.
Probably any motor with this peak torque or more will be 
fine, and no need for more, 54Nm is plenty.

Jon

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Re: [Emc-users] Servo Motor Retrofit sizing

[Jon Elson]

On 04/04/2017 08:57 PM, Dave Cole wrote:
> Here is a discussion about inertial mismatch.
>
> http://www.motioncontrolonline.org/content-detail.cfm/Motion-Control-Technical-Features/Understanding-the-Mysteries-of-Inertia-Mismatch/content_id/404
>
> The Sizing software that Automation Direct has on their website can be
> used to check motor sizing for non-Automation Direct motors.
>
> I have used it for years and it has never missed.
>
> Run the calculations and see how well they matched your original motors.
> That will give you an idea if you can get by with 1/2 of the original
> motor inertia.
>
>
The only time you really have to be concerned about inertia 
matching is in cases where the bandwidth of the servo loop 
is capable of exciting resonances in  coupling between the 
motor and the table. This could be a REAL issue in a system 
coupled with a timing belt driving the table directly.  It 
is probably a lot less of an issue in leadscrew systems, 
although there can be torsional resonances in the leadscrew.

Jon

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Re: [Emc-users] Cast Bracket for FHA-25 Harmonic Actuator.

[Gene Heskett]

On Tuesday 04 April 2017 06:33:33 Gregg Eshelman wrote:

> You'd use a very low fill density, no fill if the pattern can be done
> that way. Better slicers now have a variable density fill capability
> along with variable layer height.Another benefit of 3D printing PLA
> for single use casting patterns is they can be much closer to net
> shape, which will reduce machining time a lot. An extra nifty thing
> with the process is the same 3D model can be used for plaster coated
> lost wax process, where the PLA is burned out the same way, and for
> one part sand mold casting, same as the lost foam process that buries
> molded pieces of styrofoam in the sand.
>
Well, one thing at a time, and I have 2 in the fire ATM.  The 
countershaft in the sheldon spindle drive is awaiting bearings, while I 
see if I have to cut away some of the left bearing boss to allow the 
taperlock screws room to be removed and used as jack screws. Some 
preliminary checking seems to indicate I may have to "make" some room 
for the draw and jack screws.

Project two is going to need Matsche's help. As it may be that we need to 
slow that spi driver down just to get better control over the clock 
edges. I am still haveing joint errors even after the noise from the 
dials is nearly at the vanishing point. The clock signal from the pi 
seems to be slew rate limited, and so critical that I cannot boot 
linuxcnc with a 10x scope probe looking at the spi clock, its very close 
to a sine-squared wave, no real valid logic one when active high. IMO, 
any signal so critically timed as to be destroyed by a 10x scope probes 
presence, needs help in the form of a more squareish slew rate, which 
the pi apparently cannot do.

So I may look around for a 3.3 volt Damn Fast buffer just for that gpio 
pin. And digikey doesn't seem to have anything but balanced line 
drivers.  And this is a single ended circuit.

Thanks Gregg.

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)
Genes Web page 

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Re: [Emc-users] Cast Bracket for FHA-25 Harmonic Actuator.

[Gene Heskett]

On Tuesday 04 April 2017 08:14:00 Mark wrote:

> On 04/03/2017 02:24 PM, andy pugh wrote:
> > On 3 April 2017 at 18:13, Gene Heskett  wrote:
> >> link crashes firefox.  Expected?
> >
> > On your computer? Yes.
>
> Andy,
>
>
> You owe me a new keyboard for that one.  ;-)
>
>
> Mark
>
I'll have to admit I got a chuckle out of it too. ;-)

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)
Genes Web page 

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Re: [Emc-users] Cast Bracket for FHA-25 Harmonic Actuator.

[Gene Heskett]

On Tuesday 04 April 2017 12:55:10 Ralph Stirling wrote:

> I believe you can use SketchUp for generating STL files
> for 3d printing.  Pretty much any 3d cad tool in existence
> can do so.  Librecad is only 2d, so not much use.  On Linux,
> you are pretty well limited to Openscad and Freecad.
>
> -- Ralph

But while freecad is in the wheezy repo's. selecting it breaks synaptic 
and aptitude, with neither bothering to explain whats broken. So I am 
intermittently poking at openscad's tires but despite looking at the 
examples of the text file input vs the relatively poor video rendition 
it offers when that text file is compiled, I have so far not even spy'd 
the light at the other end of the tunnel.  So I printed what I could get 
from wikibooks, and will see if anything can be learned from them. But 
at 75 pages, I expect its pretty sparse for a new bee like me. Tomorrows 
project unless I see about hauling my tax stuff to the local Block 
office. I'd better do that, and get done with it so I can get 
sidetracked in it for a few days to see if osmosis might help. ;-)

> 
> From: Gene Heskett [ghesk...@shentel.net]
> Sent: Tuesday, April 4, 2017 9:29 AM
> To: emc-users@lists.sourceforge.net
> Subject: Re: [Emc-users] Cast Bracket for FHA-25 Harmonic Actuator.
>
> On Tuesday 04 April 2017 06:04:50 Erik Christiansen wrote:
> > On 04.04.17 05:00, Gene Heskett wrote:
> > > On Tuesday 04 April 2017 02:51:22 Gregg Eshelman wrote:
> > > > I wonder if they've heard about lost PLA casting? One off and
> > > > short runs without needing to make expensive, reusable patterns,
> > > > plus the ability to do casting shapes impossible with patterns
> > > > that must be removable from a sand mold, could be a money maker
> > > > for the foundry. 'Course they'd have to get and learn to use a
> > > > 3D printing setup.
> > >
> > > That looks like something I could do, if I had a big enough
> > > printer and could learn how to do the 3d model to feed the slicer
> > > software for the printer. I'm thinking of the belt guards in
> > > particular which would need at least one dimension in the 250mm by
> > > 100 by 100 range.
> >
> > Much much easier (and faster) for a relatively simple L-shaped angle
> > bracket with webs is lost polystyrene foam. For best finish, a
> > hot-wire cutter is a quite simple tool to make and use. (For the big
> > central cut-out, scribe the circle in pen, or pin on a cardboard
> > template, and cut radially to that circumference. Once around, exit
> > by the same radial cut. A little PVA glue seals that up again.) The
> > foot of the L, and webs, are similarly attached with a little PVA
> > glue.
> >
> > In extremis, lacking a hot-wire cutter, the only slicers needed are
> > a pointy breadknife to hack out the hole in the middle, and a sharp
> > box knife or similar to slice out the rectangle, triangles, and
> > external radius. Cold cutting works better (finish-wise) on that
> > fine blue "Styrofoam", sold by Dow as "Blue Ribbon Insulation
> > Boards" or "Wallmate".
> >
> > Do you have any offcuts remaining from lining the garage door, Gene?
> > You could have the pattern done in a day - for nix.
> >
> > Erik
>
> Those scraps of that blueish foam have all been binned or used years
> ago. And Lowes no longer carries that same board in 2" R22 thickness.
> The current product the last time I looked is a white, larger cell
> product and only about R20 because of that, but its the same $35 & tax
> a 4x8 foot sheet.  How it would cut with a hot wire would be TBD.
>
> The composition SW you folks use is I assume OpenScad? I started to do
> a belt cover with librecad, and had made good progress with a wire
> outline of unk dimensions but found its 2d only when I went looking
> for an extrude function.  Dropped that, installed openscad, but the
> only place I can find docs is at wikibooks. Without downloading both
> books from there, I've no clue how many pages of dead tree that would
> be.
>
> librecad apparently does not have any docs, there are none in the
> installed librecad, and clicking of the help button gets an oh fudge,
> I can't find the docs message. Theres not a separate docs package in
> the repo's for wheezy. But its pretty intuitive to draw outlines and
> such.
>
> So openscad seems to be it if I make a full 3d model, mounting tabs
> and all. Its help docs buttons go straight to wikibooks.
>
> How hot does the hot wire need to be? Seeing as how thats best
> jiggered up as a wire support frame I could stick in a vise on the
> g0704's table and rig some sort of a sheet gripper leaving a cutaway,
> for the hot wire to move within, attached to the chip pan, if I get it
> rigid enough to keep its place as the wire moves, I could probably
> just write gcode to drive the cutters path. Where it needs a lid like
> the outside face of a belt cover, just cut the outline out and glue it
> on.
>
> But, I think buying the printer would get me a nicer looking belt
> c

Re: [Emc-users] Near function not working as expected

[Jan Bos]

Hello Andy,

Thanks again and I will see if I got more issues to help you out

Jan

On Tue, Apr 4, 2017 at 8:42 AM, andy pugh  wrote:

> On 4 April 2017 at 01:33, Jan Bos  wrote:
> > Thanks, surprises me each time how something so simple can be overlooked.
>
> That is also why my coolant pump wasn't working this evening. Guessing
> your problem let me find my problem immediately. :-)
>
> --
> 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, 1916
>
> 
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