Anilam RBS-T User manual

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RBS-T Linear Encoder Installation Manual and Owner’s Guide
P/N 70000426 - Warranty
All rights reserved. Subject to change without notice. iii
03-Nov-98
Warranty
ANILAM warrants its products to be free from defects in material and workmanship for three
(3) years from date of installation. At our option, we will repair or replace any defective
product upon prepaid return to our factory.
This warranty applies to all products when used in a normal industrial environment. Any
unauthorized tampering, misuse or neglect will make this warranty null and void.
Under no circumstances will ANILAM, any affiliate, or related company assume any liability
for loss of use or for any direct or consequential damages.
The foregoing warranties are in lieu of all other warranties expressed or implied, including,
but not limited to, the implied warranties of merchantability and fitness for a particular
purpose.
The information in this manual has been thoroughly reviewed and is believed to be accurate.
ANILAM reserves the right to make changes to improve reliability, function, or design
without notice. ANILAM assumes no liability arising out of the application or use of the
product described herein. All rights reserved. Subject to change without notice.
Copyright 1998 ACU-RITE Companies, Inc.

RBS-T Linear Encoder Installation Manual and Owner’s Guide
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03-Nov-98
Contents
Introduction ......................................................................................................................1
Encoder Specifications ....................................................................................................2
Tools & Equipment Required ...........................................................................................4
General Installation and Safety Information.....................................................................4
Knee Mill Installations ......................................................................................................6
Y Axis Installation (Side Mount) On Bridgeport Type Machines....................................6
Y Axis Installation (Side Mount) On Lagun Type Machines ........................................11
X Axis Installation (Back Side of Table) Lagun and Bridgeport Machines...................16
X Axis Installation (Front Side of Table) Lagun and Bridgeport Type Machines .........19
Lathe Installations..........................................................................................................23
Cross Slide (X Axis) Installation..................................................................................23
Z Axis Installation........................................................................................................27
EDM Installations...........................................................................................................33
Optical Comparator Installations....................................................................................33
Connecting the Linear Encoder .....................................................................................34
Testing the Encoder.......................................................................................................34
Maintenance and Cleaning ............................................................................................35
Troubleshooting Guide...................................................................................................36
Encoder Replacement Parts ..........................................................................................37
Replacing A Reader Head ..........................................................................................38
Installation Kit Parts .......................................................................................................39
Lagun X and Y Axis Knee Mill Kit (P/N 32500073) .....................................................39
Bridgeport X and Y Axis Knee Mill Kit (P/N 32500108)...............................................40
Lathe X Axis (Cross Slide) Kit (P/N 32500174)...........................................................41
Lathe Z Axis Backer Bar Kits ......................................................................................42
Universal Reader Head Mounting Kit (P/N 32500030)................................................43
Index .....................................................................................................................Index-1

RBS-T Linear Encoder Installation Manual and Owner’s Guide
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Introduction
The RBS-T is the latest design of linear encoders offered by Anilam. RBS-T linear encoders
have absolute reference marks. To take advantage of the absolute reference marks, a
compatible Anilam DRO or CNC must be used and properly set up. A product that does not
support absolute reference marks will interpret the absolute reference marks as reference
marks approximately every 0.5-in. (12.70-mm). The RBS-T linear encoders are shipped
pre-assembled and come with a mounting kit suitable for most installations.
This document outlines standard RBS-T encoder installation procedures for knee mills,
lathes, and EDM machines. It contains specifications, maintenance information, and a
troubleshooting guide for encoder owners.
For additional information, please contact your local authorized ANILAM distributor, or call
us directly:
ANILAM
One Precision Way
Jamestown, NY, 14701
Phone: (716) 661-1899
FAX: (716) 661-1884
www.anilam.com

RBS-T Linear Encoder Installation Manual and Owner’s Guide
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Encoder Specifications
70000426-1
Figure 1, RBS-T Linear Encoder Mounting Dimensions
Table 1, RBS-T Linear Encoder Operating Specifications
Weight 0.335 Kg + 1.145 Kg/m Operating Temp 0-50°C
Grating Pitch 0.02 mm Storage Temp -20°- 70°C
Resolution 0.005 mm / 0.001 mm Operating Humidity 5% - 95% relative
humidity.
Accuracy +/- .005 mm/m or
+/-.01 mm/m
Storage Humidity 5% - 95% relative
humidity
Repeatability 1.4 µm Required Move Force 4 N max.
Slew Rate 0.5 m/s Coefficient of Linear
Expansion
10 µm/°/m
Acceleration 5g shock, 14g @ 10 ms CE Mark Yes
Feed Power 5V +/- 5%, 120 mA
max.
Reference Marks Absolute reference
marks or standard
marks approximately
every 12.70-mm (0.5 in.)
Cable Length 4m & 6m (std), 0-254m
available upon order.
Light Source Siemens LED OP 264

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Table 2, ANILAM Encoder Part Number Listing
1 Micron
Encoders
ANILAM Part
Number
5 Micron
Encoders
ANILAM Part
Number
@2”/50 mm 20501002 @2”/50 mm 20505002
@4”/100 mm 20501004 @4”/100 mm 20505004
@6”/150 mm 20501006 @6”/150 mm 20505006
@8”/200 mm 20501008 @8”/200 mm 20505008
@10”/250 mm 20501010 @10”/250 mm 20505010
@12”/300 mm 20501012 @12”/300 mm 20505012
@14”/350 mm 20501014 @14”/350 mm 20505014
@16”/400 mm 20501016 @16”/400 mm 20505016
@18”/450 mm 20501018 @18”/450 mm 20505018
@20”/500 mm 20501020 @20”/500 mm 20505020
@24”/600 mm 20501024 @24”/600 mm 20505024
@26”/650 mm 20501026 @26”/650 mm 20505026
@27”/675 mm 20501027 @30”/750 mm 20505030
@30”/750 mm 20501030 @33”/825 mm 20505033
@33”/825 mm 20501033 @36”/900 mm 20505036
@36”/900 mm 20501036 @42”/1050 mm 20505042
@42”/1050 mm 20501042 @48”/1200 mm 20505048
@48”/1200 mm 20501048 @54”/1375 mm 20505054
@54”/1375 mm 20501054 @60”/1525 mm 20505060
@60”/1525 mm 20501060 @65”/1650 mm 20505065
@65”/1650 mm 20501065 @72”/1850 mm 20505072
@72”/1850 mm 20501072 @80”/2050 mm 20505080
@80”/2050 mm 20501080 @90”/2300 mm 20505090
@90”/2300 mm 20501090 @100”/2550 mm 20505100
@100”/2550 mm 20501100 @110”/2800 mm 20505110
@110”/2800 mm 20501110 @120”/3050 mm 20505120
@120”/3050 mm 20501120

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Tools & Equipment Required
Indicator, 0.0005” resolution, with magnetic base
Spirit (bubble) level
Hex keys (Allen wrenches), metric sizes
Hex keys (Allen wrenches), English sizes
Drill, 3/8” chuck
Taps, sized as follows: #8-32, #10-32, 1/4-20
Drill bits, sized as follows: #29, #21, #7, and 1/4”
Tap handle
Transfer punches, complete set
Ball peen hammer
Center punch
Safety glasses
Combination square, 12”
Torque wrench (set to 24 in-lbs.)
General Installation and Safety Information
Qualified personnel should only perform this installation. Read the entire procedure and
become familiar with the parts before starting the installation.
Wear eye protection and follow standard shop safety practices while installing this equipment.
Encoders contain glass components that can break. Do not drop the encoder. Do not use a
hammer on the encoder.
This document describes typical installations. Custom installations may require a different
arrangement of mounting brackets. The following guidelines apply for every installation.
·The reader head mounting bracket must maintain the alignment set by the plastic
alignment brackets. This alignment must be preserved through out the machine’s entire
range of travel along the encoder.
·The run out along the top of the encoder must be parallel to the machine’s movement
along the axis (within 0.002”) over the entire range of travel.
·The run out along the face of the encoder must be parallel to the machine’s movement
along the axis (within 0.005”) over the entire range of travel.
·The encoder should be mounted so the reader head can never come in contact with the
end caps.
Mounting brackets for large custom applications can be manufactured locally. When designing
custom brackets, note that excessively long or weak brackets can cause the readout display to
flutter from machine vibration.
Ensure all mounting surfaces are solid.

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When planning an installation, consider the routing of the cable. The cable should not be
routed so it is in danger of being pinched or crushed by moving parts. Cables should not drape
across any more open space than necessary.
The encoder can be installed with either side against the machine. Switching sides changes
the direction that the cable feeds out of the reader head. Choose the side that permits the most
convenient cable routing.
All holes should be drilled and tapped 90 degrees to the mounting surface.
RBS-T Linear Encoders are precision measuring instruments. Failure to mount the encoder
properly can result in encoder damage or poor accuracy.
RBS-T Linear Encoders are optical devices. Dirt or debris blown past the lip seals into the
encoder housing can affect the performance of the encoder. Install the encoder in a manner
that minimizes the possibility of coolant and debris getting into the encoder body. In extreme
environments consider fitting a splash shield to the encoder.
In all cases, the encoder should be installed with the lip seal and reader head down and away
from a direct spray of coolant and chips.
Inventory the parts in each installation kit. Check that all of the required parts are included.
Check the machine’s travel along each axis and verify that encoder sizes are correct for the
machine.
Encoders contain no internal alignment mechanism. When the plastic reader head alignment
brackets are removed, the reader head is floating loose inside the encoder body. The only way
to position the reader head for installation is by installing the plastic alignment brackets.
The goal of the reader head alignment procedure is to preserve the alignment set by the plastic
alignment brackets when the reader head is mounted to the machine.
CAUTION: Do not use an encoder that is shorter than the machine’s range of travel.
Knee Mill Installations
ANILAM Kits provide all of the necessary parts and hardware for the standard knee mill
installations described here.
Y Axis Installation (Side Mount) On Bridgeport Type Machines
Bridgeport X and Y Axis Knee Mill Kit, (P/N 32500108) provides mounting brackets and
hardware for Y-axis encoder installations (on the side of the knee) and X axis encoder
installations (on the front of the table) for Bridgeport type machines.

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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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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 kit contains 0.005” shims. 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.
Installing and Aligning Y Axis Encoder
Forward mounting screw
installed in predrilled #8-32
mounting hole.
Mark mounting hole
locations with punch
Encoder
Backer Bar
Plastic Reader Head
Alignment Brackets
RBS-5
S/N 010
P/N
M.Length
-0034567
20501048
1200 mm
F05
S/N 010 -0034567
F 02
5V
RBS-5
T
Figure 3, Aligning the Encoder
1. Before installing the encoder, remove both end caps and visually check the
alignment of the reader head. Verify that the reader head is centered within the
housing and is not twisted in any way. Do not reinstall the end caps at this time.
2. Break loose the two screws holding the reader head alignment brackets to the
reader head. Re-tighten only enough to keep the brackets in place. The reader
head alignment brackets must be installed to align the reader head. They will be
removed at the end of the procedure.
3. Place the encoder against the backer bar and install the forward #8-32 mounting
screw.
NOTE: On 12” and 16” installations the forward mounting screw will usually support the
encoder long enough to locate the undrilled mounting holes. When installing a long
encoder, mark and drill the first mounting hole near the center of the encoder. This will
help balance the weight of the encoder while the holes are being located.
4. Refer to Figure 3, Aligning the Encoder. Mount a magnetic indicator on the saddle
so the indicator probe measures the position of the top of the encoder.

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5. Move the saddle through its full range of travel and observe the indicator. The top of
the encoder should be parallel to the Y axis movement of the saddle (within 0.002”)
along its entire length. Use a transfer punch to mark the remaining holes.
6. Drill and tap the remaining #8-32 mounting holes.
7. Install the encoder using the #8-32 screws provided. Tighten the screws just
enough to hold the encoder in place.
8. Re-align the encoder. Using a torque wrench, tighten the screws to 24 in-lbs. Do
not overtighten the screws.
NOTE: If the encoder is not properly aligned the reader head will not read correctly.
Recheck the alignment.
Mounting and Aligning Y Axis Reader Head
Reader Head
Mounting Bracket
Encoder & Backer Bar
Bracket Mounting
Screws
KNEE
Figure 4, Reader Head Mounting Bracket Installation
1. Refer to Figure 4, Reader Head Mounting Bracket Installation. Loosely
assemble the reader head mounting bracket to the end of saddle using the 1/4-20
bracket mounting screws and washers provided.
2. Adjust the saddle and position the reader head mounting bracket so the reader head
mounting screw holes are aligned. The reader head mounting bracket should be flat
against the saddle and impose no twist or strain on the reader head.

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#8-32 Reader Head Mounting Screws
#6-32 Jack Screws
#8-32 Nylon Self Locking Nuts
BPALGN
S/N 010 -0034567
F 02
5V
RBS-5
Figure 5, Reader Head Mounting Hardware
CAUTION: Do not use the reader head mounting screws to pull the reader head
flush against the reader head mounting bracket. The reader head must stay
aligned with the encoder body. The jack screws hold the reader head away from
the reader head mounting bracket when the mounting screws are tightened.
3. Refer to Figure 5. Place the two nylon self-locking nuts in the cavities on the back
side of the reader head. Start the two #8-32 cap screws into the nuts, but do not
tighten. Start the four jack screws into the reader head mounting bracket.
RBS-5
S/N010
P/N
M.Length
-0034567
20501048
1200mm
F05
Reader Head
Indicator
Jack Screws (4)
Backer Bar
& Encoder
INDY
Figure 6, Indicator Positioning For Reader Head Alignment

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4. Refer to Figure 6, Indicator Positioning For Reader Head Alignment. Set up an
indicator so the probe measures the position of the front the reader head. A cutout
at the bottom of the bracket provides access for the indicator probe.
Zero the indicator. Screw in the first jack screw until it just contacts the reader head.
Continue turning the jack screw until it pushes the reader head 0.001”. Do this for
each of the four jack screws. The reader head should be about 0.004” away from its
original position.
5. Using a torque wrench, tighten the two mounting screws to 24 in-lbs. Tightening the
reader head mounting screws should pull the reader head back against the jack
screws taking out the 0.004” and restoring its original position.
If the reader head does not return to within 0.001” of its original position, loosen the
mounting screws and repeat the alignment procedure. When repeating the
procedure, compensate the adjustments so the reader head returns to its original
position when the mounting screws are tightened.
6. Remove the plastic alignment brackets from the reader head.
NOTE: Save the plastic alignment brackets. If the encoder is ever removed from
the machine, it cannot be reinstalled without the reader head alignment brackets.
7. After the installation is complete, perform a second visual inspection of the reader
head and reinstall both end caps.
Y Axis Installation (Side Mount) On Lagun Type Machines
Lagun X and Y Axis Knee Mill Kit (P/N 32500073) provides mounting brackets and hardware
for Y-axis encoder installations (on the side of the knee) and X axis encoder installations (on
the front of the table) for Lagun type machines.
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 area around these holes is flat and free from
burrs.
Machines that do not have pre-existing holes, need to be drilled and tapped. The
best method for locating the holes will depend on the machine. If the saddle has
pre-drilled holes that can be used to attach the reader head mounting brackets, the
reader head brackets can be used as a guide for positioning the encoder and backer
bar.

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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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Installing and Aligning Y Axis Encoder
Forward mounting screw
installed in predrilled #8-32
mounting hole.
Mark mounting hole
locations with punch
Encoder
Backer Bar
IND-TOP
Plastic Reader Head
Alignment Brackets
RBS-5
S/N 010
P/N
M.Length
-0034567
20501048
1200 mm
F05
S/N 010 -0034567
F 02
5V
RBS-5
T
Figure 8, Aligning the Encoder
1. Before installing the encoder, remove both end caps and visually check the
alignment of the reader head. Verify that the reader head is centered within the
housing and is not twisted in any way. Do not reinstall the end caps at this time.
2. Break loose the two screws holding the reader head alignment brackets to the
reader head. Retighten only enough to keep the brackets in place. The reader
head alignment brackets must be installed to align the reader head. They will be
removed at the end of the procedure.
3. Refer to Figure 8, Aligning the Encoder. Place the encoder against the backer bar
and install the forward #8-32 mounting screw.
NOTE: On 12” and 16” installations the forward mounting screw will usually support the
encoder long enough to locate the undrilled mounting holes. When installing a long
encoder, mark and drill the first mounting hole near the center of the encoder. This will
help balance the weight of the encoder while the holes are being located.
4. Mount a magnetic indicator on the saddle so the indicator probe measures the
position of the top of the encoder.
5. Move the saddle through its full range of travel and observe the indicator. The top of
the encoder should be parallel to the Y axis movement of the saddle (within 0.002”)
along its entire length. Use a transfer punch to mark the remaining holes.
6. Drill and tap the remaining #8-32 mounting holes.
7. Install the encoder using the #8-32 screws provided. Tighten the screws just
enough to hold the encoder in place.
8. Re-align the encoder. Using a torque wrench, tighten the screws to 24 in-lbs. Do
not overtighten the screws.
NOTE: If the encoder is not properly aligned the reader head will not read correctly.
9. Recheck the alignment.

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Mounting and Aligning Y Axis Reader Head
073VRMT
Figure 9, Vertical Block and Reader Head Bracket Installation
1. Refer to Figure 9, Vertical Block and Reader Head Bracket Installation. Loosely
assemble the vertical block and the reader head bracket to the saddle using the 1/4-
20 cap screws and washers provided.
2. Adjust the saddle and the reader head mounting brackets so that the reader head
mounting screw holes are aligned.
3. Tighten the hardware holding the vertical block and the reader head bracket to the
saddle.
CAUTION: Do not use the reader head mounting screws to pull the reader head
flush against the reader head mounting bracket. The reader head must stay
aligned with the encoder body. The jack screws hold the reader head away from
the reader head mounting bracket when the mounting screws are tightened.
4. Refer to Figure 10, Reader Head Mounting Hardware. Place the two nylon self-
locking nuts in the cavities on the back side of the reader head. Start the two #8-32
reader head mounting screws into the nuts, but do not tighten.

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#8-32 Reader Head Mounting Screws
#6-32 Jack Screws
Figure 10, Reader Head Mounting Hardware
5. Start the four jack screws into the reader head mounting bracket. For a standard
installation, use the screw pattern shown in Figure 10. For a custom installation,
use any rectangular pattern of screws. Ensure that none of the jack screws are
positioned over a cavity or screw head.
Reader Head Mounting Bracket
Scale
Reader Head
Spacer Block
Indicator
INDYUN
Figure 11, Indicator Setup For Reader Head Alignment
6. Refer to Figure 11. Set up an indicator to measure the position of the front the
reader head.
Zero the indicator. Screw in the first jack screw until it just contacts the reader head.
Continue turning the jack screw until it pushes the reader head 0.001”. Do this for
each of the four jack screws. The reader head should be about 0.004” away from its
original position.

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7. Using a torque wrench, tighten the two mounting screws to 24 in-lbs. Tightening the
reader head mounting screws should pull the reader head back against the jack
screws taking out the 0.004” and restoring its original position.
If the reader head does not return to within 0.001” of its original position, loosen the
mounting screws and repeat the alignment procedure. When repeating the
procedure, compensate the adjustments so the reader head returns to its original
position when the mounting screws are tightened.
8. Remove the plastic alignment brackets from the reader head.
NOTE: Save the plastic alignment brackets. If the encoder is ever removed from
the machine, it cannot be reinstalled without the reader head alignment brackets.
9. After the installation is complete, perform a second visual inspection of the reader
head. Reinstall both end caps.
X Axis Installation (Back Side of Table) Lagun and Bridgeport Machines
No brackets are required to perform an X-axis installation on the back side of the table for
either a Bridgeport or Lagun type machine.
Installing and Aligning X Axis Encoder
In this installation, the encoder is mounted to the machined surface on the back side of
the table. The reader head extends below the table and is mounted directly to the
saddle. When the encoder is placed against the back surface of the table, the saddle
should not interfere with the reader head’s alignment (when the plastic reader head
alignment brackets are installed).
1. Before installing the encoder, remove both end caps and visually check the
alignment of the reader head. Verify that the reader head is centered within the
housing and is not twisted in any way. Do not reinstall the end caps at this time.
2. Refer to Figure 12, X Axis Encoder Positioning. Center the X axis encoder along the
length of the rear face of the table, with the bottom of the encoder even with the
table’s bottom. Two bar magnets placed against the lower face of the table way
make a good temporary support.

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Magnetic Blocks
Encoder Mounting Hole
Encoder
Saddle Stop Block
XAXISSM
Figure 12, X Axis Encoder Positioning
3. Using a transfer punch, locate the encoder mounting screw positions.
4. Drill and tap the required #8-32 X 1/2” (minimum) mounting holes.
5. Mount the encoder using the #8-32 screws provided. Tighten the screws just
enough to hold the encoder in place, and still be loose enough to make alignment
adjustments.
6. Mount an indicator on the knee and adjust the probe to measure the position of the
top of the encoder.
7. Slowly move the X-axis through its entire range of travel while observing the
indicator. The top of the encoder should be parallel to the X axis movement of the
table (within 0.002”) over its entire range of travel.
NOTE: If the encoder is not properly aligned the reader head will not read correctly.
8. Loosen the screws at one end of the encoder, and adjust the position up or down as
required for alignment. The play in the mounting holes should provide enough
movement.
9. Once aligned, fully tighten the mounting screws.
10. Recheck the alignment.
Mounting and Aligning X Axis Reader Head
1. Move the table to the dead stop position at one end of its range of travel.
2. Slide the reader head as far as it will go in the same direction.

RBS-T Linear Encoder Installation Manual and Owner’s Guide
P/N 70000426
All rights reserved. Subject to change without notice. Page 17 of 43
03-Nov-98
3. Use a transfer punch to locate the position of the two reader head mounting holes
on the rear face of the saddle.
4. Drill and tap two #8-32 X 1/2” (minimum) mounting screw holes.
Nuts Not Installed In Reader Head Body
#8-32 Jack Screws
#8-32 Socket Head Mounting Screws
RB-6
Figure 13, X Axis Back Of Table Reader Head Mount
5. Refer to Figure 13. Set up an indicator so the probe measures the position of the
front the reader head.
Screw in the first jack screw until it just contacts the saddle. Continue turning the
jack screw until it pushes the reader head 0.001”. Do this for each of the three jack
screws. The reader head should be about 0.004” away from its original position.
6. Using a torque wrench, tighten the two mounting screws to 24 in-lbs. Tightening the
reader head mounting screws should pull the reader head back against the jack
screws taking out the 0.004” and restoring its original position.
If the reader head does not return to within 0.001” of its original position, loosen the
mounting screws and repeat the alignment procedure. When repeating the
procedure, compensate the adjustments so the reader head returns to its original
position when the mounting screws are tightened.
7. Remove the plastic alignment brackets from the reader head.
NOTE: Save the plastic alignment brackets. If the encoder is ever removed from
the machine, it cannot be reinstalled without the reader head alignment brackets.
8. After the installation is complete, perform a second visual inspection of the reader
head. Reinstall both end caps.
9. A saddle stop block should be installed to keep the encoder from accidentally being
crushed between the saddle and the machine column. The stop block is a block of
metal approximately 1/8” thicker than the encoder. The stop block should be bolted
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