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A taper thread milling Custom Macro

by Mitchell Callan of Fuller precision Inc.


I have written a macro that machines a taper thread with a single point thread milling cutter. This will help anyone that doesn't have a true pipe thread mill. Also, it forms a spiral motion, which is necessary for taper thread milling even if a true taper thread mill is used. It will cut any pitch or size of pipe threads


In main program:

  • G65 P9000 U0. W0. A.375 R5. E10. Z-.5 V18. F10.

Custom macro:

  • O9000 (PIPE THREADS)

  • (U IS X LOCATION)

  • (W IS Y LOCATION)

  • (A=STARTING RADIUS)

  • (R=NUMBER OF MOVES PER CIRCLE)

  • (Z=DEPTH)

  • (E=NUMBER OF PASSES [thickness / pitch])

  • (V=THREADS PER INCH)

  • (F=FEED)

  • #3=0.0

  • #10=360 / #18

  • #109=#10

  • #110=1 / #22

  • #111=0.0625 / #22

  • #3=#18

  • G00 X#21 Y#23

  • G01 Z#26 F#9

  • #19=#1 + #21

  • G01 X#19 Y#23 F#9

  • N2 #26=#26 + #110 / #109

  • #24=COS[ #3 ] * #1

  • #25=SIN[ #3 ] * #1

  • #24=#24 + #21

  • #25=#25 + #23

  • G01 X#24 Y#25 Z#26 F#9

  • #3=#3 + #18

  • #1=#1 + #111 / #109

  • IF [ #3 LE 360.00000 * #8 ] GOTO2

  • G01 X#21 Y#23 F10.

  • G00 Z1. M09

  • M99

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