Limit Angle - Siemens SINUMERIK 840D sl Function Manual

Program code
N70 GEOAX(2, Y2)
N80 TANG(A, X, Y)
N90 TANGON(A, 90)
...
11.4

Limit angle

Description of problem
When the axis moves backwards and forwards along the path, the tangent turns abruptly
through 180 degrees at the path reversal point. This response is not generally desirable for
this type of machining operation (e.g. grinding of a contour). It is far better for the reverse
motion to be executed at the same offset angle (negative) as the forward motion.
Figure 11-3
Special functions
Function Manual, 01/2015, 6FC5397-2BP40-5BA2
Comment
; Geometry axis switchover permitted
; Redef. Follow-up axis group
; Follow-up group with Y2 is being activated
Backward and forward motion on the path
T3: Tangential control - 840D sl only
11.4 Limit angle
513