RBS-T Linear Encoder Installation Manual and Owner’s Guide
P/N 70000426
All rights reserved. Subject to change without notice.
Page 27 of 43
03-Nov-98
Z Axis Installation
On the Z-axis of the lathe, the backer bar (and encoder) are usually mounted on the
back side of the bed. The reader head is mounted to a bracket fixed on the saddle.
This procedure outlines the installation of a Z-axis encoder using one of the optional
lathe Z-axis backer bar kits.
On most installations, the bed of the lathe is not a machined surface. To compensate
for surface unevenness a backer bar is used. The backer bar is drilled and tapped to
accept regularly spaced 1/4-20 internal wrenching jack screws. The backer bar is
supported away from the lathe bed on the jack screws. The backer bar mounting bolts
oppose the jack screws and hold the backer bar against lathe bed.
When properly installed, the face of the backer bar should be parallel to the Z axis
movement of the saddle (within 0.005”) along its entire range of movement.
Additionally, the face of the backer bar should lie in a single plane (no twisting).
A universal reader head mounting bracket (found in the universal reader head mounting
kit) is used with a spacer block to mount the reader head. The backer bar should be
mounted so the holes in the reader head will line up with the mounting holes in the
reader head mounting bracket when the encoder is installed.
CAUTION: The encoder and reader head should never be positioned so it is
possible for the machine to drive the reader head beyond the encoder’s range of
travel.
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