HEIDENHAIN TNC 640 User Manual page 575

Multiple-Axis Machining | The PLANE function: Tilting the working plane (option 8)
Positioning the rotary axes in a separate block
Proceed as follows if you want to position the rotary axes in a
separate positioning block (option STAY selected):
Danger of collision!
The control does not automatically check whether collisions can
occur between the tool and the workpiece. Incorrect or no pre-
positioning before tilting the tool to position can lead to a risk of
collision during the tilting movement!
Program a safe position of the tool before the tilting
movement.
Carefully test the NC program or program section in the
Program run, single block operating mode
Select any PLANE function, and define automatic tilting to
position with the STAY option. During program execution, the
control calculates the position values of the rotary axes present
on the machine, and stores them in the system parameters
Q120 (A axis), Q121 (B axis) and Q122 (C axis)
Define the positioning block with the angular values calculated
by the control.
Example: Tilt a machine with a rotary table C and a tilting table A to a spatial angle of B+45
...
N10 G00 Z+250 G40*
N20 PLANE SPATIAL SPA+0 SPB+45 SPC+0 STAY*
N30 G01 A+Q120 C+Q122 F2000*
...
HEIDENHAIN | TNC 640 | ISO Programming User's Manual | 10/2017
NOTICE
Position at clearance height
Define and activate the PLANE function
Position the rotary axis with the values calculated by the
control.
Define machining in the tilted working plane
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