RBS-T Linear Encoder Installation Manual and Owner’s Guide
P/N 70000426
Page 6 of 43
All rights reserved. Subject to change without notice.
03-Nov-98
Install Y Axis Backer Bar
1. Position the saddle against the dead stop furthest from the column.
2. The backer bar is mounted using the existing holes on the side of the knee. Strip
the paint from the area around each hole to provide solid contact between the
spacers and the machine. Ensure the areas around these holes are flat and free
from burrs.
3/8-16 Screw
Flat Washer
(3 Places Typ)
0.005" Shim
Spacers
(3 Places Typ)
Backer Bar Face
Predrilled #8-32 Encoder Mounting Hole
Figure 2, Bridgeport Type Backer Bar Installation
3. Refer to
Figure 2
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 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 4, Reader Head Mounting Bracket Installation
).
4. Temporarily install the reader head mounting bracket 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 run along the
face of the backer bar.
2. Move the saddle through its range of travel while observing the indicator. The face
of the backer bar should be parallel to the Y axis movement of the saddle (within
0.005”) over its entire range of travel.
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