HEIDENHAIN TNC 640 User Manual page 310

7
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: 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*
310
Programming Contours | Path contours – Polar coordinates
After entering the angle, specify
HEIDENHAIN | TNC 640 | ISO Programming User's Manual | 10/2017