Re: [Emc-users] A project I want to do on a CNC mill

2013-04-12 Thread Walt Scrivens 
inkscape makes this easy in Linux.  with the gcodetools extension, producing 
the g-code is a snal too.

Walt

On Apr 11, 2013, at 10:10 PM, jeremy youngs  wrote:

> just get a picture with something of KNOWN size in it raster it in a vector
> program ( photoshop will do this ) import to autocad as dxf, measure known
> point to point divide known measurement by measurement made in autocad then
> rescale to the quotient  . trim all but desired out of dxf . import to
> mastercam write program make :)
> now how to do this with all linux programs well i havent got there yet but
> when i do i will swear off bill gates forever:)
> note perpendicularity of the photo is very crucial to get accurate scaling
> this can be used with any photo sometimes to an accuracy of a couple of
> thousandths depending on perpendicularity and the accuracy of the known
> measured item
> 
> 
> On Thu, Apr 11, 2013 at 9:49 PM, Gregg Eshelman  wrote:
> 
>> I'd like to get the exact dimensions for the triangle pattern used in the
>> wall and floor panels of Skylab. Looks like there are round holes, possibly
>> threaded, where the triangle holes meet.
>> 
>> Why that pattern? Because it's an interesting design and looks like it
>> could be useful for other purposes, especially if the round holes are
>> threaded.
>> 
>> Anyone live near the Air and Space Museum? Would they allow someone in
>> with a digital caliper to take measurements?
>> 
>> The only other places I know of that may have those panels are the two
>> Skylab simulators, if they were built to fully duplicate the two built for
>> launching.
>> 
>> 
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> 
> 
> 
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( ͡° ͜ʖ ͡°)

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Re: [Emc-users] Youtube 5axis cutting an impeller

2013-04-12 Thread Sebastian Kuzminsky 
On 04/12/2013 12:12 AM, Rudy du Preez wrote:
> I have uploaded to videos on YouTube showing the cutting of an impeller with
> Linuxcnc using the XYZACkins that I wrote (on the Wiki).
>
> The videos are not very professional, and the 5axis setup is just a test of
> functionality, using two rotary tables, one mounted on the other. The
> machine is a converted 3-axis Hermle 780.
>
> If you google for "XYZACkins" you should find it.

Very cool Rudy!  How did you generate the gcode for this?  Some big 
commercial CAD/CAM package?

Here's the videos for the lazyweb:

https://www.youtube.com/watch?v=x-OYB5KCrqk
https://www.youtube.com/watch?v=Oh9eCupbsso


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Re: [Emc-users] Youtube 5axis cutting an impeller

2013-04-12 Thread jeremy youngs 
did backlash cause any issues with the rotaty tables?


On Fri, Apr 12, 2013 at 2:12 AM, Rudy du Preez  wrote:

> I have uploaded to videos on YouTube showing the cutting of an impeller
> with
> Linuxcnc using the XYZACkins that I wrote (on the Wiki).
>
> The videos are not very professional, and the 5axis setup is just a test of
> functionality, using two rotary tables, one mounted on the other. The
> machine is a converted 3-axis Hermle 780.
>
> If you google for "XYZACkins" you should find it.
>
> Rudy
>
>
>
> --
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> analytics on semi-structured data. The platform includes APIs for building
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Re: [Emc-users] Poor CV

2013-04-12 Thread Viesturs Lācis 
2013/4/12 Kenneth Lerman 

> On 4/10/2013 5:01 PM, andy pugh wrote:
> > On 10 April 2013 21:50, dave  wrote:
> >
> >> No panacea anywhere in sight.
> > Something I saw somewhere on the Internet (possibly a link from mah)
> > was an article about different approaches.
> > One very interesting idea was that every "move" as well as being an
> > end-point also includes an "end velocity"
> > I think that these "end velocities" need to propagate backwards back
> > up the queue.
> >
> While we are looking at this, we should be sure to consider adding jerk
> limits to the system.
>

Am I missing something or s-curve velocity profile, which means also
implemented jerk limits has been developed by Araisrobo and is already in
joints_axes branch? IIRC the problem for this not being ready for
mainstream is lack of spindle synchronization.

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Re: [Emc-users] Closed loop stepping system

2013-04-12 Thread Jon Elson 
Gene Heskett wrote:
>
>
> Humm, now that you mention that, I read something similar on the net a few 
> years agom from somebody at Gecko.  Could have been the same person I'd 
> have to assume.
>  
>   
Mariss is the designer and owner of Gecko, and an awesome engineer.
> Which is 17 amps more than my lathe spindle has.  I wonder if that could 
> make me a REAL variable speed spindle.  This one runs out of steam when the 
> steel is above 5/8" in diameter.  Supposedly a 250 watt motor, older 7zx12.  
> I'd like to take it up to shaving 1.75" to 2" stock.  Could that reverse 
> w/o needing to toggle a 4pdt relay? 
>
>   
Yes.  I use one of my servo amps to run the spindle of my minimill, and 
it does
reversing under computer control when rigid tapping.  If you have some
kind of spindle speed sensing or spindle encoder, then you could have 
closed-
loop spindle speed control.

Jon


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Re: [Emc-users] A project I want to do on a CNC mill

2013-04-12 Thread Ed Nisley 
On 04/11/2013 11:20 PM, Gregg Eshelman wrote:
> The radius of the points of the triangles is given as 0.228 inch

I read it as "0.22R", which is almost exactly half the "0.438 DIA" given 
for the holes. Using 0.438/2 would be Close Enough, methinks.

That'd be fun to construct on a 3D printer... one with a build platform 
the size of my living room!

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Re: [Emc-users] Closed loop stepping system

2013-04-12 Thread Gene Heskett 
On Friday 12 April 2013 13:36:59 Jon Elson did opine:

> Gene Heskett wrote:
> > Humm, now that you mention that, I read something similar on the net a
> > few years agom from somebody at Gecko.  Could have been the same
> > person I'd have to assume.
> 
> Mariss is the designer and owner of Gecko, and an awesome engineer.
> 
> > Which is 17 amps more than my lathe spindle has.  I wonder if that
> > could make me a REAL variable speed spindle.  This one runs out of
> > steam when the steel is above 5/8" in diameter.  Supposedly a 250
> > watt motor, older 7zx12. I'd like to take it up to shaving 1.75" to
> > 2" stock.  Could that reverse w/o needing to toggle a 4pdt relay?
> 
> Yes.  I use one of my servo amps to run the spindle of my minimill, and
> it does
> reversing under computer control when rigid tapping.  If you have some
> kind of spindle speed sensing or spindle encoder, then you could have
> closed-
> loop spindle speed control.
> 
> Jon

I don't have that on the mill, very limited space to install, and a very 
dirty environment inside the gear case.  Lots of flying grease.  Which 
doesn't help, and may hinder because grease deteriorates some plastics, 
I've lost the hubs out of 2 of those "nylon" gears now.
 
Just one of the reasons why that mill may yet get replaced to a grizzly 
go704.
> 
> 
> -- Precog is a next-generation analytics platform capable of
> advanced analytics on semi-structured data. The platform includes APIs
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Cheers, Gene
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Re: [Emc-users] A project I want to do on a CNC mill

2013-04-12 Thread Gene Heskett 
On Friday 12 April 2013 13:40:54 Ed Nisley did opine:

> On 04/11/2013 11:20 PM, Gregg Eshelman wrote:
> > The radius of the points of the triangles is given as 0.228 inch
> 
> I read it as "0.22R", which is almost exactly half the "0.438 DIA" given
> for the holes. Using 0.438/2 would be Close Enough, methinks.
> 
> That'd be fun to construct on a 3D printer... one with a build platform
> the size of my living room!

Chuckle, but what then would you do for a wife?  That would not only wreck 
her plans for the living room, but wipe out the bank account too?  :)

But we dream, and its the dreams we make our reality from.  :)

Cheers, Gene
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Re: [Emc-users] Closed loop stepping system

2013-04-12 Thread andy pugh 
On 12 April 2013 18:40, Gene Heskett  wrote:

> I don't have that on the mill, very limited space to install, and a very
> dirty environment inside the gear case.  Lots of flying grease.  Which
> doesn't help, and may hinder because grease deteriorates some plastics,
> I've lost the hubs out of 2 of those "nylon" gears now.

Steel replacements exist:
http://www.littlemachineshop.com/products/product_view.php?ProductID=3453&category=

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Re: [Emc-users] Closed loop stepping system

2013-04-12 Thread Gene Heskett 
On Friday 12 April 2013 14:43:55 andy pugh did opine:

> On 12 April 2013 18:40, Gene Heskett  wrote:
> > I don't have that on the mill, very limited space to install, and a
> > very dirty environment inside the gear case.  Lots of flying grease. 
> > Which doesn't help, and may hinder because grease deteriorates some
> > plastics, I've lost the hubs out of 2 of those "nylon" gears now.
> 
> Steel replacements exist:
> http://www.littlemachineshop.com/products/product_view.php?ProductID=345
> 3&category=

That is for the next bigger mill, this things original carcass was the 
micro-mill from Harbor Freight.  I have talked about that with Chris at 
LMS, and it for sure doesn't fit my head.  Darnit.

Cheers, Gene
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Re: [Emc-users] Poor CV

2013-04-12 Thread Chris Radek 
On Fri, Apr 12, 2013 at 06:54:10PM +0300, Viesturs L??cis wrote:
> 
> Am I missing something or s-curve velocity profile, which means also
> implemented jerk limits has been developed by Araisrobo and is already in
> joints_axes branch? IIRC the problem for this not being ready for
> mainstream is lack of spindle synchronization.

It is not incorporated because it was not completed as far as I
know.  Here is the last discussion in 4/2012: 

http://thread.gmane.org/gmane.linux.distributions.emc.devel/6364/

Also be aware that just adding a jerk constraint without changing
the basic planning algorithm will make programs that are currently
being limited due to short gcode segments run slower.


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Re: [Emc-users] Closed loop stepping system

2013-04-12 Thread andy pugh 
On 12 April 2013 19:45, Gene Heskett  wrote:

>> Steel replacements exist:
>> http://www.littlemachineshop.com/products/product_view.php?ProductID=345
>> 3&category=
>
> That is for the next bigger mill,

Some of us have hobbing equipment and can make gears.

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Re: [Emc-users] Youtube 5axis cutting an impeller

2013-04-12 Thread Marius Liebenberg 
I see Rudy is not answering. As far as I know he used Mastercam for the 
CAM generation.

On 2013/04/12 08:32 AM, Andrew wrote:
> Great!
> What is your CAM?
>
> Andrew
>
> Andrew
> http://parallelrobots.blogspot.com/
>
>
> 2013/4/12 Rudy du Preez 
>
>> I have uploaded to videos on YouTube showing the cutting of an impeller
>> with
>> Linuxcnc using the XYZACkins that I wrote (on the Wiki).
>>
>> The videos are not very professional, and the 5axis setup is just a test of
>> functionality, using two rotary tables, one mounted on the other. The
>> machine is a converted 3-axis Hermle 780.
>>
>> If you google for "XYZACkins" you should find it.
>>
>> Rudy
>>
>>
>>
>> --
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>> analytics on semi-structured data. The platform includes APIs for building
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Re: [Emc-users] Youtube 5axis cutting an impeller

2013-04-12 Thread Andrew 
2013/4/12 Marius Liebenberg
https://mail.google.com/mail/?view=cm&fs=1&tf=1&to=mar...@mastercut.co.za>
>

> I see Rudy is not answering. As far as I know he used Mastercam for the
> CAM generation.
>
> Marius, thanks for your reply!
The next question is which post was used.
It's not confirmed here http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Cam_Post that
Mastercam post can do 5axis.



> On 2013/04/12 08:32 AM, Andrew wrote:
> > Great!
> > What is your CAM?
> >
> > Andrew
> >
> > Andrew
> > http://parallelrobots.blogspot.com/
> >
> >
> > 2013/4/12 Rudy du Preez 
> > https://mail.google.com/mail/?view=cm&fs=1&tf=1&to=r...@asmsa.co.za>
> >
> >
> >> I have uploaded to videos on YouTube showing the cutting of an impeller
> >> with
> >> Linuxcnc using the XYZACkins that I wrote (on the Wiki).
> >>
> >> The videos are not very professional, and the 5axis setup is just a
> test of
> >> functionality, using two rotary tables, one mounted on the other. The
> >> machine is a converted 3-axis Hermle 780.
> >>
> >> If you google for "XYZACkins" you should find it.
> >>
> >> Rudy
> >>
> >>
> >>
> >>
> --
> >> Precog is a next-generation analytics platform capable of advanced
> >> analytics on semi-structured data. The platform includes APIs for
> building
> >> apps and a phenomenal toolset for data science. Developers can use
> >> our toolset for easy data analysis & visualization. Get a free account!
> >> http://www2.precog.com/precogplatform/slashdotnewsletter
> >> ___
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> >> https://lists.sourceforge.net/lists/listinfo/emc-users
> >>
>
> --
> Regards / Groete
>
> Marius D. Liebenberg
> MasterCut cc
> Cel: +27 82 698 3251
> Tel: +27 12 743 6064
> Fax: +27 86 551 8029
> Skype: marius_d.liebenberg
> Skype Me^(TM)! 
> Get Skype  and call me for free.
>
>
>
>
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>
>
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Re: [Emc-users] Youtube 5axis cutting an impeller

2013-04-12 Thread Stuart Stevenson 
Yes, Master cam post can do 5 axis.
On Apr 12, 2013 3:27 PM, "Andrew"  wrote:

> 2013/4/12 Marius Liebenberg
>  https://mail.google.com/mail/?view=cm&fs=1&tf=1&to=mar...@mastercut.co.za>
> >
>
> > I see Rudy is not answering. As far as I know he used Mastercam for the
> > CAM generation.
> >
> > Marius, thanks for your reply!
> The next question is which post was used.
> It's not confirmed here http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Cam_Postthat
> Mastercam post can do 5axis.
>
>
>
> > On 2013/04/12 08:32 AM, Andrew wrote:
> > > Great!
> > > What is your CAM?
> > >
> > > Andrew
> > >
> > > Andrew
> > > http://parallelrobots.blogspot.com/
> > >
> > >
> > > 2013/4/12 Rudy du Preez  https://mail.google.com/mail/?view=cm&fs=1&tf=1&to=r...@asmsa.co.za>
> > >
> > >
> > >> I have uploaded to videos on YouTube showing the cutting of an
> impeller
> > >> with
> > >> Linuxcnc using the XYZACkins that I wrote (on the Wiki).
> > >>
> > >> The videos are not very professional, and the 5axis setup is just a
> > test of
> > >> functionality, using two rotary tables, one mounted on the other. The
> > >> machine is a converted 3-axis Hermle 780.
> > >>
> > >> If you google for "XYZACkins" you should find it.
> > >>
> > >> Rudy
> > >>
> > >>
> > >>
> > >>
> >
> --
> > >> Precog is a next-generation analytics platform capable of advanced
> > >> analytics on semi-structured data. The platform includes APIs for
> > building
> > >> apps and a phenomenal toolset for data science. Developers can use
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Re: [Emc-users] Closed loop stepping system

2013-04-12 Thread Gene Heskett 
On Friday 12 April 2013 18:45:02 andy pugh did opine:

> On 12 April 2013 19:45, Gene Heskett  wrote:
> >> Steel replacements exist:
> >> http://www.littlemachineshop.com/products/product_view.php?ProductID=
> >> 345 3&category=
> > 
> > That is for the next bigger mill,
> 
> Some of us have hobbing equipment and can make gears.

Maybe, but thats a lot of work for someone with little return & no noise 
reduction.

I've had my name on Chris's list for the belt drive 3 speed conversion, IF 
the guy that made them 10 years ago ever makes any more of them.  

OTOH, I just did my taxes today, so a G0704 might follow me home from the 
Grizzly store in Muncy PA before the summer gets full blown.  I am hearing 
rumors of Dee wanting to go see her sister, near Ithaca NY which will make 
a good excuse to detour from Williamsport PA on over to Muncy as we go by 
that neck of the woods going one way or the other.  At nominally 400 lbs by 
the time I throw in some tools, methinks the Toy might be able to handle 
that.

Cheers, Gene
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Re: [Emc-users] Closed loop stepping system

2013-04-12 Thread andy pugh 
On 12 April 2013 23:55, Gene Heskett  wrote:

>> Some of us have hobbing equipment and can make gears.
>
> Maybe, but thats a lot of work for someone with little return & no noise
> reduction.

I do it for fun. But you will be appalled at the noise increase.
Belt drive probably is the way to go.
Did I mention I can make belt pulleys too?
http://youtu.be/ltmZrDrt6pQ

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Re: [Emc-users] Closed loop stepping system

2013-04-12 Thread Gene Heskett 
On Friday 12 April 2013 21:26:22 andy pugh did opine:

> On 12 April 2013 23:55, Gene Heskett  wrote:
> >> Some of us have hobbing equipment and can make gears.
> > 
> > Maybe, but thats a lot of work for someone with little return & no
> > noise reduction.
> 
> I do it for fun. But you will be appalled at the noise increase.

Its quite tiresome to these old ears now, not just the whine, but the 
rattling too.

> Belt drive probably is the way to go.
> Did I mention I can make belt pulleys too?
> http://youtu.be/ltmZrDrt6pQ

I see that.  I have an A table and its tailstock, but the tooth would have 
to be rather laboriously formed by a ball nosed, small mill.  And I would 
have to figure out the initial diameter needed to get x teeth per turn, 
which in gilmer belting, seems to be pretty critical else the belt would be 
obviously trying to climb out of the slot near the end of the wrap.  I 
would probably be farther ahead just to order the pulleys, and using a 5mm 
center hole as a locater, machine the holes to fit the shafting.  That also 
means a sliding mount for the motor so the belt could be flipped from pair 
to pair.  That whole box with its sliding cluster gear setup, needs to go, 
its way too big now that the controller has been removed and it gets in the 
way of the A axis, severely restricting table movement because of that in 
favor of a slightly taller but much more compact direct to the spindle from 
the motor belted design.  One with about 2x the low speed geardown 
available now, and the same 2x higher on the top end.  And my screws are 
wearing out, just another reason to go get the G0704 & put some real screws 
in it. 

There are other, heavier and more rigid machines available but that one is 
by far the most operating volume per dollar spent.

Cheers, Gene
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[Emc-users] Will LinuxCNC work with this motor and controller kit?

2013-04-12 Thread Gregg Eshelman 
Driver board, 4 motors and power supply. DB25 for parallel port, looks like a 
DE9 for limit switches and e-stop, third connector for manual control unit.

http://www.ebay.com/itm/200592694416

Going to do the cable drive on the pattern follower torch, need something 
that'll work with LinuxCNC. After spending the big $ on the Dragon-Cut with 
Mach3 for the plasma table... Time to save some coin on this torch project.

Also need to find out how to setup LinuxCNC for a 4 axis cable drive. May as 
well go with 4 to ensure the torch position is always solidly controlled 
instead of depending on weights or springs to keep it tight.

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Re: [Emc-users] Will LinuxCNC work with this motor and controller kit?

2013-04-12 Thread jeremy youngs 
no experience with this but when doing my studies i found several bits of
bad p.r for the tb6560 driver . maybe others with experience with them can
chime in. also as an integrated driver if one section goes bad you are
repaing the whole board or replacing it . with discreet drives you keep an
extra around and if one bellies up you swap 7 wires and get back to
business . but considering the application i dont think you will be taxing
the fortitude of the system and most concerns if iirc were when maxing the
voltage to the drives . And last thats all i know about that :)


On Fri, Apr 12, 2013 at 10:42 PM, Gregg Eshelman  wrote:

> Driver board, 4 motors and power supply. DB25 for parallel port, looks
> like a DE9 for limit switches and e-stop, third connector for manual
> control unit.
>
> http://www.ebay.com/itm/200592694416
>
> Going to do the cable drive on the pattern follower torch, need something
> that'll work with LinuxCNC. After spending the big $ on the Dragon-Cut with
> Mach3 for the plasma table... Time to save some coin on this torch project.
>
> Also need to find out how to setup LinuxCNC for a 4 axis cable drive. May
> as well go with 4 to ensure the torch position is always solidly controlled
> instead of depending on weights or springs to keep it tight.
>
>
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> analytics on semi-structured data. The platform includes APIs for building
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Re: [Emc-users] Closed loop stepping system

2013-04-12 Thread Jon Elson 
Gene Heskett wrote:
> I don't have that on the mill, very limited space to install, and a very 
> dirty environment inside the gear case.  Lots of flying grease.  Which 
> doesn't help, and may hinder because grease deteriorates some plastics, 
> I've lost the hubs out of 2 of those "nylon" gears now.
>  
> Just one of the reasons why that mill may yet get replaced to a grizzly 
> go704.
>   
Well, I used some gear tooth sensors that are made to go inside a
car transmission, so they are heat and lube-resistant.  Of course,
they need ferrous gears.  On my mini-mill, I mounted the spindle
encoder outside the head, see the last picture here :
http://pico-systems.com/minimill.html

As for the Bridgeport encoder contraption, see
http://pico-systems.com/bridge_spindle.html
for a description of the gear tooth sensors and how I installed
them.

Jon

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Re: [Emc-users] Closed loop stepping system

2013-04-12 Thread Gene Heskett 
On Saturday 13 April 2013 00:13:15 Jon Elson did opine:

> Gene Heskett wrote:
> > I don't have that on the mill, very limited space to install, and a
> > very dirty environment inside the gear case.  Lots of flying grease. 
> > Which doesn't help, and may hinder because grease deteriorates some
> > plastics, I've lost the hubs out of 2 of those "nylon" gears now.
> > 
> > Just one of the reasons why that mill may yet get replaced to a
> > grizzly go704.
> 
> Well, I used some gear tooth sensors that are made to go inside a
> car transmission, so they are heat and lube-resistant.  Of course,
> they need ferrous gears.

Of which, this toy has none.  All nylon.  For your encoder hanging 
outboard, is is a problem to access the drawbolt for tool changing?


> On my mini-mill, I mounted the spindle
> encoder outside the head, see the last picture here :
> http://pico-systems.com/minimill.html
> 
> As for the Bridgeport encoder contraption, see
> http://pico-systems.com/bridge_spindle.html
> for a description of the gear tooth sensors and how I installed
> them.
> 
> Jon

Cheers, Gene
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