Fal, Falz And Falx (Final Machining Allowance); Ff1, Ff2 And Ff3 (Feedrate) - Siemens SINUMERIK 840D Programming Manual

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FAL, FALZ and FALX (final machining allowance)

The final machining allowance for the roughing
operation is either defined in parameters FALZ and
FALX if you wish to enter different final machining
allowances for each axis or in parameter FAL if you
wish to enter a final machining allowance that follows a
contour. In this case, this value is used for the final
machining allowance in both axes.
The programmed values are not subjected to a
plausibility check. If all three parameters are assigned
values, all the final machining allowances are calculated
by the cycle. It is, however, advisable to decide on one
or the other form of final machining allowance definition.
Roughing is always performed to these final machining
allowances. After each paraxial roughing operation the
resulting residual corners are immediately cut parallel to
the contour so that these do not have to be removed
after the roughing operation is completed. If no final
machining allowances have been programmed,
roughing is performed to the final contour.

FF1, FF2 and FF3 (feedrate)

You can define different feedrates for the different
machining steps as is shown in the figure on the
right.
 Siemens AG 2000 All rights reserved.
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide, Cycles (PGZ) - 04.00 Edition
4.5 Stock removal cycle – CYCLE95
X
X
Turning Cycles
G1/G2/G3
G0
Roughing
FF1
FF2
FF1
Finishing
FF3
4
Z
Z
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