RBS-T Linear Encoder Installation Manual and Owner’s Guide
P/N 70000426
All rights reserved. Subject to change without notice.
Page 11 of 43
03-Nov-98
1/4-20 Screw
(3 Places Typ)
0.005" Shim
Spacers
(3 Places Typ)
Backer Bar Face
Predrilled #8-32 Mounting Hole
Figure 7, Lagun Type Backer Bar Installation
3. Refer to
Figure 7
and assemble the Y axis backer bar to the knee. When the
backer bar is properly oriented, the elongated slots are near the top and the
predrilled #8-32 mounting hole is away from the column. If the mounting screws are
difficult to thread in, chase the threads with a tap. Tighten the screws just enough to
hold the backer bar in place.
The backer bar supports the encoder (with reader head). Use enough spacers
behind the backer bar to position the reader head no more than 1/4” from the reader
head mounting bracket (see
Figure 9, Vertical Block and Reader Head Bracket
Installation
).
4. Temporarily install the reader head mounting brackets and hold the encoder against
the backer bar to check the backer bar spacing.
Checking Y Axis Backer Bar Alignment
1. Mount an indicator on the bottom of the saddle. Position the probe to measure the
position of the face of the backer bar.
2. Move the saddle through its full range of travel while observing the indicator. The
face of the backer bar should be parallel to Y-axis movement of the saddle (within
0.005”) over its entire range of travel.
NOTE: If the backer bar is not correctly aligned, the reader head will not read correctly.
3. Insert 0.005” shims under the backer bar spacers to adjust the alignment to within
limits. The 0.005” shims are supplied in the kit. If adding shims is not sufficient, it
may be necessary to face off a spacer.
4. Once the backer bar is aligned, fully tighten the mounting screws.
5. Recheck the alignment.
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