The difference is, one was easier for thy guy setting up the code to do it that way. They are (or can be if the codes are set up right) functionally the same. The spiral from AlibreCAM looks rather sloppy to me especially considering that it is computer generated code. An arc based spiral can be much better than that. There are also some examples floating around of parametric spirals for Linuxcnc using polar coordinates. They also work using small line segments and are rather simple to code.
Todd Zuercher P. Graham Dunn Inc. 630 Henry Street Dalton, Ohio 44618 Phone: (330)828-2105ext. 2031 -----Original Message----- From: Brent Loschen <brent.losc...@gmail.com> Sent: Thursday, September 26, 2019 1:36 AM To: emc-users@lists.sourceforge.net Subject: Re: [Emc-users] G-Code issue with IJ This entire thread has been very interesting to me. I've learned a lot about arc moves and creating spirals, but I'm curious why the large number of short G1 moves (generated by PathPilot) is "better" than fewer G2/G3 moves? Seems like a nearly constant feedrate/chipload (similar to adaptive clearing) would be better than thousands of start/stops/accel/decel - what am I missing? Brent On 9/24/2019 2:45 PM, Ken Strauss wrote: > I decided to see what Tormach generates with their conversational > programming in PathPilot (LinuxCNC pretty face). I don't recall the > original parameters so I requested a circular pocket, 0.5 deep, 1.0 > diameter, at 0,0, 0.5 DoC, 1/4-inch cutter (what was in the spindle). > It spirals down in a 1/2 pocket to full depth and then does a spiral out. I'm > happy to try different parameters. > (Mill - Circular Pocket G-code generated: Tue Sep 24 16:36:41 2019 ) ... cut ... > > (Spiral) > F 15.0 (Arc Feed, inches/minute) > G1 X 0.1250 Y 0.0000 > F 15.0 (Arc Feed, inches/minute) > G1 X 0.1252 Y 0.0110 > F 15.1 (Arc Feed, inches/minute) > G1 X 0.1245 Y 0.0219 > F 15.1 (Arc Feed, inches/minute) > G1 X 0.1228 Y 0.0329 > F 15.2 (Arc Feed, inches/minute) > G1 X 0.1201 Y 0.0437 > ... cut ... > (----- End of Circular Pocket -----) > > M30 (End of Program) > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
