HEIDENHAIN TNC 370 - 5.7 M Functions for Contouring Behavior and Coordinate Data

5 Programming Tool Movements
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5.7
M Functions for Contouring Behavior and Coordinate Data
The following miscellaneous functions enable you to change the standard
contouring behavior of the TNC 370 in certain situations, such as:
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l Smoothing corners
l Machining small contour steps
l Machining open contour corners
l Entering machine-referenced coordinates
Smoothing corners: MS0
Standard behavior - without M90
At angular transitions such as internal corners and contours without radius
compensation, the TNC stops the axes briefly.
Advantages:
l Reduced wear on the machine
l High definition of outside corners
In program blocks with radius compensation (RR/RL), the TNC automati-
cally inserts a transition arc at external corners.
Fig. 5.46:
Standard contouring behavior with
RO and without M90
Smoothing corners with M90
The tool moves around corners at constant speed.
Advantages:
l Provides a smoother, more continuous surface
l Reduces machining time
Application example:
Surfaces consisting of several straight line elements.
Fig. 5.47: Contouring behavior with RO and
M90
Duration of effect
The miscellaneous function M90 is effective only in the blocks in which it
is programmed. Operation with servo lag must be active.
A limit angle can be set in machine parameter MP7460 fsee page 128) below which the toot will muve at constant
feed rate, even when MQO is not programmed, MP 7480 is effective both with servo lag and with feed forward
control.
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TNC 370
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