Siemens SINUMERIK 840DE

Programming Motion Commands
4.13 Involute interpolation (INVCW, INVCCW)
Fundamentals
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
4-41
Example of counterclockwise involute with end point over angle of rotation
Specification of end point via angle of rotation
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N10 G1 X10 Y0 F5000 ;Approach start position
N15 G17 ;Select X/Y plane
N20 INVCCW CR=5 I-10 J0 AR=360 ;Counterclockwise involute, away from
;base circle (pos. angle setting)
with
;one full rotation
...
Description
Programming methods
1. Direct programming of the end point with X, Y or X, Y, Z
2. Programming of the angle of rotation between the start and end vectors with AR=angle
(cf. also programming of the arc angle when programming circles). If the angle of rotation
is positive (AR > 0), the path on the involute moves away from the base circle; with a
negative angle of rotation (AR < 0), the path on the involute moves towards the base
circle. The maximum angle of rotation for AR < 0 is restricted by the fact that the end
point must always lie outside the base circle.