HEIDENHAIN TNC 320 (340 551-01) - Manual (Page 172)

172 7 Programming: Miscellaneous Functions
7.
5 Miscellaneous F
unctions f
o
r Rotary Ax
es
7.5 Miscellaneous Functions for
Rotary Axes
Feed rate in mm/min on rotary axes A, B, C:
M116
Standard behavior
The TNC interprets the programmed feed rate in a rotary axis in
degrees per minute. The contouring feed rate therefore depends on
the distance from the tool center to the center of the rotary axis.
The larger this distance becomes, the greater the contouring feed
rate.
Feed rate in mm/min on rotary axes with M116
The TNC interprets the programmed feed rate in a rotary axis in mm/
min. With this miscellaneous function, the TNC calculates the feed
rate for each block at the start of the block. With a rotary axis, the feed
rate is not changed during execution of the block even if the tool
moves toward the center of the rotary axis.
Effect
M116 is effective in the working plane.
With M117 you can reset M116. M116 is also canceled at the end of
the program.
M116 becomes effective at the start of block.
The machine manufacturer must enter the machine
geometry.
Your machine manual provides more detailed information.
M116 works only on rotary tables. M116 cannot be used
with swivel heads. If your machine is equipped with a
table/head combination, the TNC ignores the swivel-head
rotary axes.