Re: [CAD_CAM_EDM_DRO] LibreCad/.DXF to G-Code for CNC drill?

I think you're over thinking what you're trying to do. To drill holes,
all the CNC has to do is go to a point co-ordinate whit the "Z' axis in
the up or clear postion and work the "Z" axis up and down. I've used
dxf2gcode to translate to get a path, then insert the drill routines
where needed. Works for me.
R Wink

On 5/28/2012 2:15 AM, Craig Carmichael wrote:
>
> Hi,
>
> Thanks Brian and Ron for your suggestions, but it looks like I'm not
> there yet and am still looking.
>
> Brian, 'Dxf2gcode' says a "point" is an undefined geometric type, and
> for circles, it wants to mill around the periphery rather than to go
> at any time to the center where I could tell it to drill.
>
> So it looks like a great program for milling, but as far as I can
> tell, it can't be used for drilling holes.
>
> ---
>
> Ron, I guess what I'm doing is peck drilling. Many (most) of the
> commands in your Mach3 example don't seem to match what I've been
> using. But I'm not very literate at this stuff so far, and the
> software is pretty old. (On the other hand, at least the drilling
> co-ordinates are there.)
>
> Here's a sample of what I have, which uses line numbers (and ignores
> any lines <100!):
>
> ; abs. pos. mode
> N101 G90
> ; go here
> N102 G00 x -0.75 y +4.0625
> ; call hole drilling sequence
> N104 M98 P1320 L1
> ; go next hole
> N106 G90 G00 x +0.75 y +4.0625
> ; call same drilling sequence
> N108 M98 P1320 L1
> ;etc, etc, etc
> N109 G90 G00 x +2.037 y +3.594
> N110 M98 P1320 L1
>
> ;=========
> N500 M30
> ;=========
>
> ;hole drilling sequence
> N1320 M44 ; wait a couple of seconds
>
> N1330 M98 P1500 L12 ; peck drill multiple times (this was thick steel)
>
> N1380 M99 ; return
>
> N1500 M20 ; drill down (pneumatic - set air pressure for desired push)
> N1520 M44 ; drill a couple of seconds
> N1530 M21 ; drill up
> N1540 M44 ; wait (then loop)
> N1550 M99
>
> ======================================
>
> >Hi Craig,
> >There are a few freeby type dxf to gcode converters about. This one
> >works well:
> ><http://christian-kohloeffel.homepage.t-online.de/index.html>http://christian-kohloeffel.homepage.t-online.de/index.html
> >Regards,Brian
> >--- On Thu, 24/5/12, Craig Carmichael
> ><<mailto:craig%40saers.com>craig@...
> <mailto:craig%40saers.com>> wrote:
> >
> >From: Craig Carmichael <<mailto:craig%40saers.com>craig@...
> <mailto:craig%40saers.com>>
> >Subject: [CAD_CAM_EDM_DRO] LibreCad/.DXF to G-Code for CNC drill?
> >To:
> <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>CAD_CAM_EDM_DRO@yahoogroups.com
> <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>
> >Date: Thursday, 24 May, 2012, 19:59
> >
> >
> >
> >Hi,
> >
> >I've drawn up XY co-ordinates in LibreCAD, for a CNC to drill bolt &
> >
> >vent holes in round rotors/plates for my Electric Hubcap 5KW pancake
> >
> >motors. (When I couldn't figure out how to do and dupliate things at
> >
> >exact angles around a circle, I got good step by step instructions
> >
> >from LibreCAD's help forum.)
> >
> >I suspect there are people here who'll know... Now that I've done the
> >
> >drawing, how might I get a G-Code drill program from it?
> >
> >(Bla bla bla: My CNC drill/router, which I bought from the guy who
> >
> >made it maybe 10+ years ago, has no more sophisticated software than
> >
> >the G-Code controller. ...Previously, I worked out the co-ordinates
> >
> >via sines and cosines in a spreadsheet, and then created the g-code
> >
> >program by hand, cutting and pasting each number to where it needed
> >
> >to be. Now to make a change I have to do it all over again. Obviously
> >
> >I need to start moving into the modern era, so this time I downloaded
> >
> >LibreCAD.)
> >
> >TIA,
> >
> >Craig
> >
> ><http://www.ElectricHubcap.com/>http://www.ElectricHubcap.com/
> >
> >===
>
>
>
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