Siemens SINUMERIK 840D sl Function Manual page 1422

W1: Tool offset
18.5 Tool radius compensation 2D (TRC)
● The end point of the circle is obtained from N30, since only the Z position is programmed
in N20
● Infeed motion
– From Z20 to Z7 (DISCL=AC(7)) with rapid traverse
– Then on to Z0 with FAD=200
– Approach circle in X-Y-plane and following blocks with F1500
The following conditions must be true for retraction:
● Smooth retraction is activated in block N60
● Retraction movement performed with quadrant (G248) and helix (G340)
● FAD not programmed, since irrelevant for G340
● Z=2 in the start point; Z=8 in the end point, since DISCL=6
● When DISR=5, the radius of SAR contour=20; that of the tool center point path=5
● After the circle block, the retraction movement leads from Z8 to Z20 and the movement is
parallel to the XY plane up to the end point at X70 Y0
Figure 18-22 Contour example 2
Part program:
Program code
$TC_DP1[1,1]=120
$TC_DP6[1,1]=10
1422
(In order that this velocity becomes effective in the following blocks, the active G-code
G0 in N30 must be overwritten with G1. Otherwise, the contour would continue to be
machined with G0.)
Comment
; Tool definition T1/D1
; Radius
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions