Siemens SINUMERIK 828D

V1: Feedrates
17.2 Path feedrate F
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
1371
The following is assumed when determining the radius:
• The transverse axis position 0 in the Work represents the center of rotation.
• Position offsets (such as online tool offset, external work offset, $AA_OFF, DRF offset and compile cycles)
and position components through couplings (e.g. following axis for TRAIL) are not taken into account when
determining the radius.
Frames (e.g. programmable frames such as SCALE, TRANS or ROT) are taken into account in the calculation of
the spindle speed and can bring about a change in speed, if the effective diameter at the TCP changes.
Diameter programming and reference axis for several transverse axes in one channel:
One or more transverse axes are permitted and can be activated simultaneously or separately:
• Programming and displaying in the HMI operator interface in the diameter
• Assignment of the specified reference axis with SCC[AX] for a constant cutting rate G96, G961, G962
References:
Function Manual Basic Functions; Transverse Axes (P1), example
Example
S
G96
= 230 m/min
• where r = 0.2 m → n = 183.12 rpm
• where r = 0.1 m → n = 366.24 rpm
⇒ The smaller the workpiece diameter, the higher the speed.
For G96, G961 or G962 a geometry axis must be defined as the transverse axis.
The transverse axis, whose position affects the speed of the mater spindle, is defined using channel-specific
machine data:
MD20100 $MC_DIAMETER_AX_DEF (geometry axis with transverse axis function?)
The function G96, G961 or G962 requires the machine zero and the workpiece zero of the transverse axis to be
in the turning center of the spindle.
Constant speed (G97, G971)
G97, G971 deactivates the "Constant cutting rate function" (G96, G961) and saves the last calculated spindle
speed. With G97, the feedrate is interpreted as a revolutional feedrate (as with G95).
When programming G971, linear feedrate is selected (as with G94). The feedrate F is interpreted in mm/min or
inch/min.
n: Spindle speed
S
Speed
: Programmed cutting rate
π Circle constant
r: Radius (distance, center of rotation to TCP)
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