Feedrate Control and Spindle Motion
7.17 Blockwise feed (FB...)
Fundamentals
7-46 Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Programming
FB=<Wert> Feed motion only in one block
Parameters
FB=...= Instead of the modal feedrate active in the previous
block, you can program a separate feedrate for this block;
in the block that follows, the previously active modal
feedrate applies.
<WERT> The programmed value of FB=<Wert> must be greater than
zero.
Feed value
The address FB is used to define the feedrate only for the current block. After this block, the
previously active modal feedrate is active.
The feedrate is interpreted according to the active feedrate type:
• G94: feedrate in mm/min or degrees/min
• G95: feedrate in mm/rev or inch/rev
• G96: constant cutting rate
References: /FB1/ Description of Functions, V1, Feedrates
Further information:
• If no traversing motion is programmed in the block (e.g. computation block), the FB has
no effect.
• If no explicit feed for chamfering/rounding is programmed, then the value of FB also
applies for any contour element chamfering/rounding in this block.
• Feedrate interpolations FLIN, FCUB, etc. are also possible without restriction.
• Simultaneous programming of FB and FD (handwheel travel with feed overlay) or F
(modal path feedrate) is not possible.
Examples
N10 G0 X0 Y0 G17 F100
G94
;Initial setting
N20 G1 X10 ;Feedrate 100 mm/min
N30 X20 FB=80 ;Feedrate 80 mm/min
N40 X30 ;Feedrate is 100 mm/min again
N50 ...
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