Siemens SINUMERIK 840Di sl - Involute Interpolation (INVCW, INVCCW)

Motion commands
4.13 Involute interpolation (INVCW, INVCCW)
Fundamentals
Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
155
4.13 Involute interpolation (INVCW, INVCCW)
Function
The involute of the circle is a curve traced out from the end point on a "piece of string"
unwinding from the curve. Involute interpolation allows trajectories along an involute. It takes
place in the plane, in which the base circle is defined. Start and end points outside this plane
result in superimposition on a curve in space, analogous to helical interpolation with circles.
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When paths perpendicular to the active plane are also programmed, it is possible to traverse
an involute in space (comparable to helical interpolation with circles).
Programming
INVCW X... Y... Z... I... J... K... CR=...
Or
INVCCW X... Y... Z... I... J... K... CR=...
Or
INVCW I... J... K... CR=... AR=...
Or
INVCCW I... J... K... CR=... AR=...