Differential Speed Between Leading And Following Spindles - Siemens SINUMERIK 840D sl Function Manual

Extended functions

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Table of Contents

NC Start (DB21, ... DBX7.1)

(See Section "Response of the synchronous-spindle coupling for NC Start (Page 774)")

NC Start after NC Stop does not deselect synchronous operation.

Differential speed between leading and following spindles

When does a differential speed occur?

A differential speed develops, e.g. with turning machine applications, when two spindles

oppose one other. Through the signed addition of two speed sources, a speed component is

derived from the leading spindle via the coupling factor. In addition to this, for the following

spindle a speed (S...) and a direction of rotation (M3/M4) can be programmed.

Generally, to achieve synchronous operation, a coupling factor is used with a value of '-1'. This

sign reversal then results in a differential speed for the following spindle as compared to an

additional programmed speed.

This typical behavior in relation to the NC is illustrated in the following diagram.

Extended Functions

Function Manual, 10/2015, 6FC5397-1BP40-5BA3

S3: Synchronous spindle

14.4 Points to note

Sinumerik 828d