HEIDENHAIN TNC 640, User Manual, Page: 617 / 948

Multiple-Axis Machining | Miscellaneous functions for rotary axes
13
HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
617
13.4 Miscellaneous functions for rotary axes
Feed rate in mm/min on rotary axes A, B, C: M116
(option 8)
Standard behavior
The control interprets the programmed feed rate of a rotary axis in
degrees/min (in mm programs and also in inch programs). The 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
Refer to your machine manual.
The machine geometry must be specified by the
machine tool builder in the description of kinematics.
Programming notes:
The
M116
function can be used with table axes and
head axes.
The
M116
function is also effective if the
Tilt
working plane
function is active.
It is not possible to combine the
M128
or
TCPM
functions with
M116
. If you want to activate
M116
for an axis while the
M128
or
TCPM
function is
active, you must deactivate the compensating
movement for this axis indirectly using
M138
. This
is done indirectly because with
M138
, you specify
the axis for which the
M128
or
TCPM
function is
effective. Thus,
M116
automatically affects the very
axis that was not selected with
M138
.
Further information: "Selecting tilting axes: M138",
page 623
Without the
M128
or
TCPM
function,
M116
can be
effective for two rotary axes at the same time.
The control interprets the programmed feed rate of a rotary axis in
mm/min (or 1/10 inch/min). In this case, the control calculates the
feed rate for the block at the start of each block. The feed rate of a
rotary axis will not change while the block is executed, even if the
tool moves toward the center of the rotary axis.
Effect
M116
is effective in the working plane. Reset
M116
with
M117
. At
the end of the program,
M116
is automatically canceled.
M116
becomes effective at the start of the block.