Siemens Sinumerik 802D sl Programming Manual page 115

04.07
Format
G76 P... (m, r, a) Q... R... ;
P:
m: Number of finishing cuts
This value is modal and can also be preset using GUD7, ZSFI[24]. The value set
here can be overwritten by the NC program command.
r: Size of chamfer at the end of the thread (1/10 * thread pitch)
This value is modal and can also be preset using GUD7, ZSFI[26]. The value set
here can be overwritten by the NC program command.
a: Angle of tool cutting edge
This value is modal and can also be preset using GUD7, ZSFI[25]. The value set
here can be overwritten by the NC program command.
All the above parameters are specified by address P at the same time.
Example for address P:
G76 P012055 Q4 R0.5
P = 012055
Q: Minimum infeed depth ( Δdmin), radius value
The cutting depth is clamped at the value specified at address Q whenever the cut-
ting depth of one cycle operation ( Δd -- Δd--1) becomes less than this limit. This
value is modal and can also be preset using GUD7, ZSFI[27]. The value set here
can be overwritten by the NC program command.
R: Finishing allowance (d)
This value is modal and can also be preset using GUD7, ZSFI[28]. The value set
here can be overwritten by the NC program command.
G76 X(U)... Z(W)... R... P... Q... F... ;
X, U: Endpoint of thread in X axis direction (absolute position (X), incremental (U))
Z, W: Endpoint of thread in Z axis direction
R: Radius difference for tapered thread (i). i = 0 for ordinary straight thread
P: Thread depth (k), radius value
Q: Infeed amount for the 1st cut (Δd), radius value
F: Lead (L)
© SIEMENS AG 2007 All rights reserved
SINUMERIK 802D sl/840D sl840D/840Di sl/840Di/810D ISO Turning -- 04.07 Edition
Angle of tool cutting edge = 55 degree
Chamfer at the end of the thread=2,0 x pitch
1 finishing cut
Enhanced Level Commands
4.1 Program support functions (1)
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