Exact Positioning G09/G60, G00, Continuous Path Operation; Fine And Coarse Exact Stop Tolerance Ranges - Siemens SINUMERIK 880 Programming Manual

4 Programming of Motion Blocks
4.2.7 Exact positioning G09/G60, G00, continuous path operation G62/G64
4.2.7

Exact positioning G09/G60, G00, continuous path operation

G62/G64
4.2.7.1 Fine and coarse exact stop tolerance ranges G09/G60/G00
G09, G60 and G00 can be used to approach a target position within a specified exact stop
tolerance range. When the exact positioning window is reached, the feedrate of the traversed
axis (from P1 to P2) is reduced to 0. The following error is eliminated. At the same time a
block change is initiated and the axis motion programmed in the next block (from P2 to P3)
begins.
The action of G09 is block by block, whilst that of G60 is modal.
Functions G09 and G60 can be used, for example, for machining sharp corners, for plunge-
cutting or when reversing the direction of movement. The function G60 has no effect when
thread cutting.

Fine and coarse exact stop tolerance ranges

G09/G60 Fine exact positioning:
G00 Coarse exact positioning:
G09/ 60 with fine exact positioning
P1
G00 with coarse exact positioning
Block transition
Exact positioning window
The thin line shows the velocity variation of the control. The position controller in the NC
ensures a smooth characteristic (thick line).
If the two exact stop tolerance ranges are identical (window F1 = window F2), the effect of
G00 will be the same as that of G09/G60. The rapid traverse motion generally has a larger
exact positioning window. This saves time during rapid traversing (earlier block change).
4–26
10 µm (window F1)
250 µm (window F2)
F2
F1
P2
P3
© Siemens AG 1991 All Rights Reserved
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SINUMERIK 880, (PG)