Siemens SINUMERIK 828D Function Manual page 1364

V1: Feedrates
17.1 Brief Description
Feedrate control
The programmed feedrate can be changed during the machining or for test purposes to enable adjustment to the
changed technological conditions.
• via the machine control panel
• via the operator panel front
• via the PLC
• per program command
Feedrate interpolation
To permit flexible definition of the feed characteristic, the feed programming according to DIN 66205 has been
extended by linear and cubic characteristics.
The cubic profiles can be programmed directly or as an interpolating spline.
You can program the following feedrate profiles:
• FNORM
Response 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 Fvalue programmed in the block is traversed linearly over the path from the current value at the beginning
of the block to the end of the block, and is subsequently regarded as modal value.
• FCUB
The blockwise programmed Fvalues are - relative to the end of the block - connected by a spline. The spline
starts and ends tangentially to the previous or following feedrate setting. If the F address is missing in one
block, then the last programmed F value is used for it.
• FPO
The F address [Syntax: F=FPO (...,...,...)] designates the course of the feedrate via a polynomial from the
current value to the end of the block in which it was programmed. The end value is treated as modal from
there onwards.
The machine data:
MD20172 $MC_COMPRESS_VELO_TOL
allows a tolerance to be defined for the path feedrate if FLIN and FCUB are used in connection with compression
COMPON.
Explanations on programmable course of the feedrate are available in:
References:
/PGA/Programming Guide - Work Preparation
1364
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions