Special Cases For Crc/Tnrc - Siemens SINUMERIK 880 Programming Manual

05.91 10 Cutter Radius Compensation (CRC), Tool Nose Radius Compensation (TNRC)

10.10 Special cases for CRC/TNRC

10.10 Special cases for CRC/TNRC
The control always uses the next block to calculate the point of intersection of the compen-
sated paths. If no axes in the compensation plane are programmed in the next block, the con-
trol uses the next block but one. Contour errors can occur if the intermediate block is smaller
than the selected compensation value.
Machining is not interrupted, but an alarm is displayed.
R
R
S
S
Contour error
R
CRC/TNRC special case: Intermediate block < compensation value
R
R
S2 S1
R
R
CRC/TNRC special case: Intermediate block too small for compensation
N15
>2R N10
N05
CRC/TNRC special case: Same direction of compensation and change in traversing direction
The direction of compensation for CRC/TNRC is retained and the traversing direction is revers-
ed. The return path in N10 must exceed twice the cutter radius/tool nose radius, or the tool will
move in the wrong direction.
10–15
© Siemens AG 1991 All Rights Reserved 6ZB5 410-0HD02
SINUMERIK 880, (PG)