HEIDENHAIN TNC 640 (34059x-04) ISO programming - Manual (Page 180)

Programming: Tools
5.2 Tool data
5
180
TNC 640 | User's Manual for DIN/ISO Programming | 3/2014
Prerequisites for NC blocks with surface-normal vectors and
3-D compensation
The active radius ( R + DR) of the replacement tool must not
differ from the radius of the original tool. You can enter the delta
values (
DR) either in the tool table or in the T block. If there are
any deviations, the TNC displays an error message and does
not replace the tool. You can suppress this message with the M
function
M107, and reactivate it with M108.