Siemens SINUMERIK 828D Function Manual page 1371

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Table of Contents

Spindle speed

Programmed cutting rate

Circle constant

Radius (distance, center of rotation to TCP)

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

Function Manual Basic Functions; Transverse Axes (P1), example

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

Basic Functions

Function Manual, 09/2011, 6FC5397-0BP40-2BA0

V1: Feedrates

17.2 Path feedrate F

Sinumerik 840d sl