Brief Description
Basic logic functions: Feeds (V1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
7
Feedrate interpolation
To permit flexible definition of the feedrate characteristic, the feedrate programming
according to DIN 66205 has been extended by linear and cubic characteristics.
The cubic profiles can be programmed directly or as interpolating spline.
You can program the following feedrate profiles:
• FNORM
Behavior as per DIN 66025 (default setting).
An F value programmed in the block is applied over the entire path of the block, and is
subsequently regarded as a fixed modal value.
• FLIN
An F value programmed in the block is positioned from the current value at the start of the
block to the end of the block linearly across the path distance and applies as a modal
value thereafter.
• FCUB
The F values programmed non-modally (relative to the end of the block) are connected by
a spline. The spline starts and ends at a tangent to the previous or subsequent define
feedrate. If the F address is missing in a block, the last F value programmed is used
instead.
• FPO
The F address [syntax: F=FPO (...,...,...)] designates the feedrate response over a
polynomial from the current value to the end of the block in which it has been
programmed. The end value then applies as a modal value.
Machine data:
MD20172 $MC_COMPRESS_VELO_TOL
supports the definition of a tolerance for the path feedrate, if FLIN and FCUB are used in
conjunction with compression COMPON.
For more information about programmable feedrate paths, please see
References:
/PGA/ Programming Guide, Advanced.
Feedrate for chamfer/rounding FRC, FRCM
The machining conditions can change significantly during surface transitions to
chamfer/rounding. The chamfer/rounding contour elements therefore need their own
optimized feedrate values in order to achieve the required surface finish.
You can program the feedrate for the chamfer/rounding with FRC (non-modal) or FRCM
(modal).
Non-modal feedrate FB
A separate feedrate can be specified for a single block with the FB command. During this
block the previously active path feedrate is overwritten, after the block the previously active
modal path feedrate becomes active once more.
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