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PICList Thread
'CNC, pics, Autocad and hpgl'
1998\07\30@184227 by Brian Gracia

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Good Day All,

I was wondering if any one had built a CNC machine and used Autocad or an
Autocad generated file to run it.  I know that this is hpgl.  Does anyone
have any info on such subjects.  I am looking at two in some old issues of
Microcomputer Journal.

What I want to do is write an hpgl file to some eeprom and put it into a
pic circuit to control a cnc machine with x,y & Z axis.  Basically just
plug-n-go programming.

Any leads/help would be appreciated.

Thanks Guys,

Brian

1998\07\30@220658 by luberth

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Brian Gracia wrote:

> I was wondering if any one had built a CNC machine and used Autocad or an
> Autocad generated file to run it.  I know that this is hpgl.  Does anyone
> have any info on such subjects.


a qbasic program reads a hpgl file and sends it to
stepper motors on parallel port
http://home.wxs.nl/~luberth/plotter/plotter.htm

1998\07\31@030313 by Leon Heller

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In message <spam_OUT3.0.5.32.19980730173751.00a3d930TakeThisOuTspamhotmail.com>, Brian Gracia
<.....brian_graciaKILLspamspam@spam@HOTMAIL.COM> writes
>Good Day All,
>
>I was wondering if any one had built a CNC machine and used Autocad or an
>Autocad generated file to run it.  I know that this is hpgl.  Does anyone
>have any info on such subjects.  I am looking at two in some old issues of
>Microcomputer Journal.
>
>What I want to do is write an hpgl file to some eeprom and put it into a
>pic circuit to control a cnc machine with x,y & Z axis.  Basically just
>plug-n-go programming.
>
>Any leads/help would be appreciated.
>
>Thanks Guys,
>
>Brian


CNC software for the PC is available from one or two suppliers. They
take in an HPGL file and control stepper motors driven from the printer
port. I don't think a PIC is suitable for this.

Leon
--
Leon Heller: leonspamKILLspamlfheller.demon.co.uk http://www.lfheller.demon.co.uk
Amateur Radio Callsign G1HSM    Tel: +44 (0) 118 947 1424
See http://www.lfheller.demon.co.uk/dds.htm for details of a simple AD9850
DDS system. See " "/diy_dsp.htm for a simple DIY DSP ADSP-2104 system.

1998\07\31@102805 by Timothy D. Gray

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I agree, use a 68hc11.


>
> CNC software for the PC is available from one or two suppliers. They
> take in an HPGL file and control stepper motors driven from the printer
> port. I don't think a PIC is suitable for this.
>
> Leon
> --
> Leon Heller: .....leonKILLspamspam.....lfheller.demon.co.uk http://www.lfheller.demon.co.uk
> Amateur Radio Callsign G1HSM    Tel: +44 (0) 118 947 1424
> See http://www.lfheller.demon.co.uk/dds.htm for details of a simple AD9850
> DDS system. See " "/diy_dsp.htm for a simple DIY DSP ADSP-2104 system.
>

1998\07\31@120537 by Alan King

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Do a search for DanCad/CAM on altavista.  You'll find tons
of related info in the links.  One for example..

http://www.metalworking.com/shareware.html

> Brian Gracia wrote:
>
> > I was wondering if any one had built a CNC machine and used Autocad or an
> > Autocad generated file to run it.  I know that this is hpgl.  Does anyone
> > have any info on such subjects.


'CNC, pics, Autocad and hpgl'
1998\08\01@050957 by Peter L. Peres
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I was under the impression that hpgl is too heavy for PICs. The smallest
thing I saw doing hpgl was a Z80 based system that read data from audio
tape cassettes and drove 3 1/2 axes for PCB drilling and hole-machining.
This was oooold.

However, I know that the machines that interpreted the old-style CNC
languages were extremely dumb, much more so than a PIC. So, if one would
take a PIC and teach it to receive Gerber format in ASCII over a serial
link, one co-ordinate set at a time, and move 3 motors and a speed
controller, then a reasonable CNC drill/mill station for PCBs would result
imho. Using relatively dumb controllers, a torque feedback sensor for the
vertical axis, and some precise end sensors, this could turn out pretty
good.

It could take Pcb drill output files directly and beep the operator to
change the bit when required. A neat but time-demanding PIC project.

Peter

1998\08\03@052956 by Pavel Korensky

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At 19:37 31.7.1998 +0000, you wrote:
>However, I know that the machines that interpreted the old-style CNC
>languages were extremely dumb, much more so than a PIC. So, if one would
>take a PIC and teach it to receive Gerber format in ASCII over a serial
>link, one co-ordinate set at a time, and move 3 motors and a speed
>controller, then a reasonable CNC drill/mill station for PCBs would result
>imho. Using relatively dumb controllers, a torque feedback sensor for the
>vertical axis, and some precise end sensors, this could turn out pretty
>good.
>
>It could take Pcb drill output files directly and beep the operator to
>change the bit when required. A neat but time-demanding PIC project.

I am currently working exactly on this thing. PIC driven 3(4) axis mill for
milling, PCB drilling etc. PIC is used for interpreting the Excellon files
(for PCB drilling) and standard G-code files (for milling). Mill/drill
hardware is Sherline Mill with 3 or 4 step motors.
And yes, it is very time demanding :-))

PavelK

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