G91 (incremental distances for arc) G91.1 (incremental distances for IJK in arcs, normal IOW)
( draw a semi-circle in climb mode, ccw from 90 to 270 degrees) ( this runs y .12", .06 up to .06 down ) G3 X-0.0000 Y-0.0600 I-0.0000 J-0.0600 G90 (back to absolute distances ) I haven't programmed a g3 in a while. It looks to me like the end point and center are the same. G3 X-0.0000 Y-0.0600 I-0.0000 J-0.0300 ? John Figie On Fri, Apr 6, 2018, 3:03 PM Gene Heskett <ghesk...@shentel.net> wrote: > Greetings; > > Trying to cut a short trench in the "tap hat" to put that m4 (7mm > diameter) screw head into. > > Machine is touched off just out of end of workpiece. > > Code, with G3 line copy/pasted from arcgenm18.py. > =================================================== > g20g7 > #<_pocket_width> = 0.27900 (about 7mm's) > #<_tool_dia> = 0.24900 (let dull tool flex .0005") > ( assumes mill is 1/4" thru, so circle diameter is .0300") > #<_circle_dia> = [#<_pocket_width> - #<_tool_dia>] > #<_wobble> = [#<_circle_dia> / .5000000] ( .015" Y > trades sign at > circle) > (debug,wobble=#<_wobble>) > ( x stop, draw semi circle to other side of wobble ) > #<_x_minus> = -0.3000000 (depth of circle center > from ends of arc) > #<_x_safe> = 0.1500000 (out of workpiece) > #<_y_center> = 0.0000000 (for reference) > #<_z_top> = 0.28000000 (top surface of jig) > #<_z_final> = -0.0780000 (depth into jig to cut > 2mm into brass) > #<_z_dec> = [0.3580000 /20] (establish cut > decrement) > (debug, zdec=#<_z_dec>) > s600 > #<_z_tmp> = #<_z_top> > m6t10 (tool image small enough I can see past it in Z view) > m3 > > o100 WHILE [#<_z_tmp> gt #<_z_final>] (do depth loop) > > #<_z_tmp> = [#<_z_tmp> - #<_z_dec>] (decr > depth till done) > > G90 (absolute distance mode for depth) > > (G1 F10 z#<_z_tmp>) > > G0 z0.3 (cut air) > > G1 F5 x#<_x_safe> ( put x out of workpiece) > > G1 F10 y#<_wobble> (now put Y at plus offset location) > > G1 F5 x#<_x_minus> (drive x to start of 180 degree arc) > > G91 (incremental distances for arc) > > G91.1 (incremental distances for IJK in arcs, normal IOW) > > ( draw a semi-circle in climb mode, ccw from 90 to 270 degrees) > ( this runs y .12", .06 up to .06 down ) > G3 X-0.0000 Y-0.0600 I-0.0000 J-0.0600 > G90 (back to absolute distances ) > > G1 F5 y-#<_wobble> (should already be here) > (should be back to -wobble) > > G1 F5 x#<_x_safe> ( cut other edge of trench back out of workpiece) > > o100 ENDWHILE > m5 > m2 > % > ================================================== > And nothing I adjust can keep me from huge G3 errors, or zero radius > errors. > > This is, or sure looks like, errors like I was getting when I attempted > to carve the pillows. There I asked for help but got crickets, so I > finally wound up digging the trenchs with a SIN[#<_deg>] and a > COS[#<_deg>] for the starting XZ position of a cut nearly 4" long on the > Y axis. Worked a treat but took a while since I was only incrementing > #<_deg> by 1 degree at a time. > > What error(s) are there in the above code? > > -- > 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 <http://geneslinuxbox.net:6309/gene> > > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
