I have been following this thread with interest and decided to make try at a parametric program to generate circular pockets. It is slightly different from some of the others discussed in that it uses polar coordinates to generate the desired spiral.
It has been tested extensively (one successful run with one set of parameters on one machine) so exercise extreme caution! That said, it sounds smooth on my Tormach and I would appreciate any questions, comments or suggestions for improvements. (modified KRS 27 Sep 19) (Based on: https://gist.github.com/reox/a60c67db53eb563a4f8e) #<_pocketDia>= 1.5 #<_pocketRad> = [#<_pocketDia> / 2] #<_pocketX> = 0.000 #<_pocketY> = 0.000 #<_pocketZ> = 0.000 #<_finalZ> = -0.5 #<_toolNum> = 43 #<_feedIPM> = 40 #<_feedRPM> = 9999 #<_toolDoC> = 0.1 #<_WoCfact> = 0.25 ; max WoC = 25% of tool diameter G20 ; inches rather than metric G90 ; absolute coordinates G92.1 ; no offsets G30 ; ensure in a good place G54 ; set coordinate system G17 ; active plane is XY T#<_toolNum> M6 G43 H#<_toolNum> #<_toolDia> = #5410 #<_toolRad> = [#<_toolDia> / 2] #<_toolWoC> = [#<_toolDia> * #<_WocFact>] ; calculate Width of Cut ; calculate # turns with allowed maximum WoC #<_turns> = [FUP[[#<_pocketRad> - #<_toolRad>] / #<_toolWoC>] ] ; number of turns to pocket circle ; adjust WoC downwards to get exact total cut (debug,#<_toolWoC> is maximum WoC) #<_toolWoC> = [[#<_pocketRad> - #<_toolRad> - #<_toolWoc>] / #<_turns>] (debug,#<_toolWoC> is adjusted WoC) #<_toolWoC> = [[#<_pocketRad> - #<_toolRad> - #<_toolWoc>] / #<_turns>] (debug,#<_toolWoC> is actual WoC) ; first helix down in the middle of the pocket ; the diameter of the helix is the tool diameter + stepover #<_helixTurns> = FUP[[#<_pocketZ> - #<_finalZ>]/ #<_toolDoC>] ; adjust DoC to get integral number of turns #<_toolDoC> = [-[#<_pocketZ> + #<_finalZ>]/#<_helixTurns>] (debug,#<_helixTurns> helix turns) (debug,#<_toolDoC> adjusted DoC) #<_helixFeed> = [#<_feedIPM> / 2] ; feed slower in helix M3 S#<_feedRPM> ; set spindle RPM F#<_helixFeed> ; set feed IPM G0 X#<_pocketX> Y#<_pocketY> Z#<_pocketZ> G3 I#<_toolWoC> Z#<_finalZ> P#<_helixTurns> F#<_feedIPM> ; set feed rate for clearing cuts ( we will approximate the desired spiral #<_segments>]segments) #<_segments> = 40 #<_degrees> = [360 / #<_segments>] ( so to go #<_turns> requires #<_segments> * #<_turns> moves) #<_moves> = [#<_segments> * #<_turns>] ; # turns to clear pocket #<_currentZ> = #<_pocketZ> (debug,#<_currentZ> initial currentZ) o200 repeat [#<_helixTurns>] G90 G0 X#<_pocketX> Y#<_pocketZ> #<_currentZ> = [#<_currentZ> - #<_toolDoC>] G0 Z#<_currentZ> G91 G1 X#<_toolWoC> Y0 ; offset from pocket centre by WoC G92 X#<_toolWoC> Y0 ; offset coordinate system o100 repeat [#<_moves>] (we must increase the radius of each segment by [#<_toolWoC> / #<_segments>]) (following magic move is in polar coordinates) g91 G1 @[#<_toolWoC> / #<_segments>] ^[#<_degrees>] o100 endrepeat G92.1 ; reset coordinate offset G90 ; absolute coordinates G91.1 ; absolute arc mode (do a real circle at to finish current pocket level) G1 X[#<_pocketRad> - #<_toolRad>] G3 I[#<_toolRad>-#<_pocketRad>-#<_pocketX>] o200 endrepeat G0 Z[#<_finalZ>+.005] ; move off the pocket bottom to prevent marks G0 X#<_pocketX> Y#<_pocketY> ; move to centre of pocket M5 ; spindle off G0 Z[#<_pocketZ>] ; retract to top of pocket G30 M30 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
