HEIDENHAIN TNC 620 User Manual page 268

6
Programming contours
6.5 Path contours – Polar coordinates
Programming a helix
Always enter the same algebraic sign for the
direction of rotation and the incremental total angle
G91 H. The tool may otherwise move in a wrong
path and damage the contour.
For the total angle G91 H you can enter a value of
-99 999.9999° to +99 999.9999°.
Polar coordinates angle: Enter the total angle
of tool traverse along the helix in incremental
dimensions.
the tool axis with an axis selection key.
Coordinate: Enter the coordinate for the height of
the helix in incremental dimensions
Enter the radius compensation according to the
table
Example NC blocks: Thread M6 x 1 mm with 5 revolutions
N120 I+40 J+25*
N130 G01 Z+0 F100 M3*
N140 G11 G41 R+3 H+270*
N150 G12 G91 H-1800 Z+5*
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After entering the angle, specify
HEIDENHAIN | TNC 620 | ISO Programming User's Manual | 9/2016