Pimping the mini-lathe

;Weird thread ;Why? Because a CNC lathe can! ;Tapered 3 start RH thread 23/57"OD x Pi TPcm, 11/7 Chi long, with a 23/19e taper angle. ;Z0 is end of stock. #<_pi> = 3.2654 #<_e> = 2.71828 #<_chi>= 30.3 #<_starts> = 3 #<_OD> = [23/57*25.4] #<_Z_LeadIn> = [#<_pi>*4] #<_Pitch> = [#<_pi>] #<_ThreadDepth> = [#<_pi> /3 ] #<_ThreadLength> =-[#<_chi>*11/7] #<_TaperAngle> = [23/19*#<_e>] #<_NumThreadPasses> = ROUND[#<_ThreadDepth>/0.1] #<_SmallDia> = [#<_OD> - [SIN[#<_TaperAngle>*2]] *[#<_Z_LeadIn> + ABS[ #<_ThreadLength>]]] #<_DiaChange> = [#<_OD> - #<_SmallDia>] #<_NumCuttingPasses> = ROUND[#<_DiaChange>] #<_feedrate> = 200 #<_Speed> = 300 #1 = 1 ; Index start passes #2 = 1 ; Index threading passes #3 = 1 ; Index cutting passes O110 sub ;Cut taper O110 while [#3 LE #<_NumCuttingPasses>] G0 Z[#<_Z_LeadIn>] X[#<_SmallDia> + [[#<_NumCuttingPasses> - #3] * [#<_DiaChange> / #<_NumCuttingPasses> ]]] G01 Z[#<_ThreadLength>] X[#<_OD> + [[#<_NumCuttingPasses> - #3] * [#<_DiaChange> / #<_NumCuttingPasses> ]]] F#<_Feedrate> G0 X[#<_OD> + #<_DiaChange>] #3 = [#3 +1] O110 Endwhile O110 endsub O111 sub ; Cut Thread O100 while [#1 LE #<_starts>] O101 while [#2 LE#<_NumThreadPasses>] G0 Z[#<_Z_LeadIn> + [[#1 - 1] * [#<_Pitch>/#<_starts>]]] X[#<_SmallDia> - [[#2]*[#<_ThreadDepth> / #<_NumThreadPasses> ]]] G33 Z[#<_ThreadLength>] X[#<_OD> - [[#2 - 1] * [#<_ThreadDepth>/ #<_NumThreadPasses> ]]] K#<_Pitch> G0 X[#<_OD> + #<_DiaChange>] #2 = [#2 + 1] O101 endwhile M5 G4 P2 M3 G4 P2 #2 =1 #1 = [#1 +1] #<_SmallDia> = [#<_SmallDia> - [SIN[#<_TaperAngle>]*[#1 -1] * [#<_Pitch>/#<_starts>]]] O100 EndWhile O111 endsub ;Main G18 G21 G40 G49 G54 G80 G94 G90 G7 F#<_Feedrate> S#<_Speed> M3 G4 P2 O110 call M5 G4 P2 M3 O111 call M9 M5 M2