User's Manual ISO TNC 360 (260020xx, 280490xx) - heidenhain
User's Manual ISO TNC 360 (260020xx, 280490xx) - heidenhain
User's Manual ISO TNC 360 (260020xx, 280490xx) - heidenhain
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5 Programming Tool Movements<br />
5.6 M Functions for Contouring Behavior and Coordinate Data<br />
5-36<br />
The following miscellaneous functions enable you to change the standard<br />
contouring behavior of the <strong>TNC</strong> in certain situations, such as:<br />
• Smoothing corners<br />
• Inserting transition arcs at non-tangential transitions between straight<br />
lines<br />
• Machining small contour steps<br />
• Machining open contour corners<br />
• Entering machine-reference coordinates<br />
Smoothing corners: M90<br />
Standard behavior - without M90<br />
At angular transitions such as internal corners and contours without radius<br />
compensation, the <strong>TNC</strong> stops the axes briefly.<br />
Advantages:<br />
• Reduced wear on the machine<br />
• High definition of (outside) corners<br />
Note:<br />
In program blocks with radius compensation (G41/G42), the <strong>TNC</strong> automatically<br />
inserts a transition arc at external corners.<br />
Smoothing corners with M90<br />
The tool moves around corners at constant speed.<br />
Advantages:<br />
• Provides a smoother, more continuous surface<br />
• Reduces machining time<br />
Application example:<br />
Surfaces consisting of several straight line elements.<br />
Duration of effect<br />
The miscellaneous function M90 is effective only in the blocks in which it<br />
is programmed. Operation with servo lag must be active.<br />
A limit value can be set in machine parameter MP7460 (see page 11-<br />
9) below which the tool will move at constant feed rate (valid for<br />
operation both with servo lag and with feed precontrol). This value is<br />
valid regardless of M90.<br />
G40<br />
Fig. 5.40: Standard contouring behavior with<br />
G40 and without M90<br />
G40<br />
Fig. 5.41: Contouring behavior with G40 and<br />
M90.<br />
<strong>TNC</strong> <strong>360</strong>