46230811.pdf - 第24页

Page 22 T46230811 Rev . J DH P ositioning System Assembly , Non P/T This Document Supports Assembly 46230811 Rev J Procedures X-Y Axes Ball Bushing Preload Adjustments The X and Y axis each have four ball bushings. The b…

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Page 21
DH Positioning System Assembly, Non P/T T46230811 Rev. J
This Document Supports Assembly 46230811 Rev J
Rotary Disc Drive Motor Mounting Procedure
1. Remove (2) 4-40 Socket Heads (SHCS) from Mounting Block and
remove Drive Motor adjustment screw.
7.75"
Mounting Block
Thomson Rod
2. Mount block to X Table using the mounting hardware (10-32x1
SFHS).
3. Slide motor back onto mounting block.
.188"
Mounting Block
Stop Plate
Motor
4. Install (2) 4-40 Socket Heads, connecting stop plate to mounting
block.
Page 22
T46230811 Rev. J DH Positioning System Assembly, Non P/T
This Document Supports Assembly 46230811 Rev J
Procedures
X-Y Axes Ball Bushing Preload Adjustments
The X and Y axis each have four ball bushings. The ball bushings are
located one in each corner of the table. The locations of these ball bushings
are shown below.
Initially these adjustments are done at the factory. If the ball bushings must
be replaced, the bearing preload adjustment must be performed.
1. Power down the machine and perform Lockout/Tagout according to
local procedures.
WARNING
The machine must be powered down and the local Lockout/Tagout
procedure performed to ensure personal safety during this procedure.
2. Before installing the threaded spring plunger, apply a light coat of
Loctite 222 to the threads of the spring plunger.
CAUTION
Do not allow the sealant to enter the spring plunger tip area. No curing
time is required when using this adhesive.
3. Thread the spring plunger screw slowly into the table in a clockwise
direction so the screw begins to engage the threads. Stop when
resistance is felt against the spring plunger screw.
4. While rotating the ball bushing so the screw aligns with the bushing
slot, turn the spring plunger screw in until it bottoms.
CAUTION
Do not force the spring plunger screw past the point at which it bottoms
out or damage to the ball bushing and spring plunger will occur.
5. Back the spring plunger screw out one quarter turn.
6. Repeat steps 1 through 4 for the remaining seven ball bushings.
Ball Bushing Locations
BALL
X-
Y-
BASE
BALL
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DH Positioning System Assembly, Non P/T T46230811 Rev. J
This Document Supports Assembly 46230811 Rev J
X and Y Axes Ball Screw Unit Adjustment
Alignment of the ball screw unit axes to the support bearings is critical to the
proper function of the positioning system. Improper alignment of the ball
screw nut to the corresponding axis frame may result in misalignment of the
ball screw end in relationship to the support bearings for that axis. The
following procedure is intended to minimize the misalignment and system
drag load and thereby maximize bearing life.
NOTE
Initial adjustments are done at the factory and should not be required in
the field. If the ball screw unit must be replaced in the field, the alignment
procedure must be performed.
1. Power down the machine and perform Lockout/Tagout according to
local procedures.
WARNING
The machine must be powered down and the local Lockout/Tagout
procedure performed to ensure personal safety during this procedure.
2. Thoroughly clean the frame counterbores and if necessary, clean the
threads of the ball screw unit with a tap.
3. Loosen the mounting bolts on the bearing support blocks.
4. Install the dust bellows and protective covers over each ball screw unit.
5. Slide a ball screw unit through the mating bore in the support frame
and support the ends of the ball screw unit in the respective bearings.
6. Start the threads of the nut on the ball screw unit into the frame. Screw
the threads in until just before the aligning journal on the ball screw
unit is engaged. The ball screw unit should be loose.
7. Move the frame as close as possible to the bearing support block then
tighten the mounting screws in the bearing support block. This will
locate and align the bearing support block.
8. Move the frame as close as possible to the bearing in the motor mount.
This represents the maximum bind experienced by the ball screw unit.
9. Thread the nut of the ball screw unit fully into the counterbore. Note
the ease that is required to assemble the ball screw unit. If anything
other than finger generated force is required, disassemble the ball screw
unit and start the procedure over. Otherwise, tighten the nut in the ball
screw unit fully and secure the ball screw unit in the frame using the
no-mar set screw.