HEIDENHAIN TNC 410 ISO Programming - Manual (Page 171)

HEIDENHAIN TNC 410, TNC 426, TNC 430 145
6.5 P
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N110 G98 L1 * Identify beginning of program section repeat
N120 G13 G91 H+360 Z+1.5 F200 * Enter pitch directly as incremental Z value
N130 L1.24 * Program the number of repeats (thread revolutions)
N999999 %HELIX G71 *