Siemens SINUMERIK 840Di Function Manual page 1739

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
Fig. 2-25
Part program:
$TC_DP1[1,1]=120
$TC_DP6 [1,1] = 10
N10 G0 X0 Y0 Z20 G64 D1 T1 OFFN = 5
N20 G41 G247 G341 Z0 DISCL = AC(7) DISR = 10 F1500 FAD=200
N30 G1 X30 Y-10
N40 X40 Z2
N50 X50
N60 G248 G340 X70 Y0 Z20 DISCL = 6 DISR = 5 G40 F10000
N70 X80 Y0
N80 M 30
Tool Compensation (W1)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
parallel to the XY plane up to the end point at X70 Y0.
Contour example 2
2.4 Tool: Tool radius compensation 2D (TRC)
; Tool definition T1/D1
; Radius
Detailed Description
(P0app)
(P3app)
(P4app)
(P4ret)
(P3ret)
(P0ret)
2-59