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5 miscellaneous functions for rotary axes – HEIDENHAIN iTNC 530 (60642x-04) User Manual

Page 518

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518

Programming: Multiple Axis Machining

12.5 Miscellaneous functions f

or r

otary ax

es

12.5 Miscellaneous functions for

rotary axes

Feed rate in mm/min on rotary axes A, B, C:
M116 (software option 1)

Standard behavior
The TNC 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 axis rotation.
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 of a rotary axis in

degrees/min (or 1/10 inch/min). In this case, the TNC calculates the

feed for the block at the start of each 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 geometry must be specified by the machine

tool builder in the description of kinematics.

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.

M116

is also effective in an active tilted working plane and

in combination with M128 if you used the M138 function to

select rotary axes (see "Selecting tilting axes: M138" on

page 526). Then M116 affects only those rotary axes that

were not selected with M138.