Siemens SINUMERIK 840D sl Function Manual page 1768

Detailed description
2.3 Feedrate control
2.3.9 Non-modal feedrate FB
General
A separate feedrate can be specified for a single block with the command FB (Feed Block).
For this block the previously active path feedrate is overwritten. After this block, the
previously active modal path feedrate becomes active once more.
Function
The non-modal feedrate is programmed with FB=<value>.
The feedrate value is interpreted according to the type of feedrate active:
G94, G961, G971:
G95, G96, G97:
Constraints
• The programmed value of FB=<value> must be greater than zero.
• If no traversing motion is programmed in the block (e.g.,: computation block), FB has no
• If no explicit feedrate for chamfering/rounding is programmed, then the value of FB also
• The path velocity profile programmed with FLIN or FCUB does not act with the rotational
• Feedrate interpolations FLIN, FCUB, .. are possible without restriction.
• Simultaneous programming of FB and FD (handwheel travel with feedrate overlay) or F
(modal path feedrate) is not possible.
52
Feedrate in mm/min, inch/min or
Revolutional feedrate in mm/rev or inch/rev
effect.
applies for any contour element chamfering/rounding in this block.
feedrate for G95 and with constant cutting speed for G96/G961 and G97/G971.
/min
o
Basic logic functions: Feeds (V1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0