46230812.pdf - 第24页
Page 22 TECHNICAL PUBLICATIONS T46230812 Rev . D DH Positioning System Assembly , P/T This Document Supports Assembly 46230812 X and Y Axes Ball Screw Unit Adjustment Purpose: Alignment of the ball screw unit axes to the…
Page 21
TECHNICAL PUBLICATIONS
DH Positioning System Assembly, P/T T46230812 Rev. D
This Document Supports Assembly 46230812
Adjustment Procedures
X-Y Axes Ball Bushing Preload Adjustments
Purpose:
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.
Comments:
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. Execute your site's Lockout/Tagout
procedure.
The machine must be powered down and your site's Lockout/Tagout
procedure executed during this procedure to ensure personal safety.
2. Before installing the threaded spring plunger, apply a light coat of
Loctite 222 to the threads of the spring plunger.
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.
Do not force the spring plunger screw past the point at which it bottoms
or damage to the ball bushing and spring plunger occurs.
5. Back the spring plunger screw out one quarter turn.
6. Repeat steps 1 through 4 for the remaining seven ball bushings.
End of procedure.
Ball Bushing Locations
BALL
X-
Y-
BASE
BALL
Page 22
TECHNICAL PUBLICATIONS
T46230812 Rev. D DH Positioning System Assembly, P/T
This Document Supports Assembly 46230812
X and Y Axes Ball Screw Unit Adjustment
Purpose:
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.
Comments:
Initially these 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.
Procedure:
1. Power down the machine. Execute your site's Lockout/Tagout
procedure.
The machine must be powered down and your site's Lockout/Tagout
procedure executed during this procedure to ensure personal safety.
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.
Page 23
TECHNICAL PUBLICATIONS
DH Positioning System Assembly, P/T T46230812 Rev. D
This Document Supports Assembly 46230812
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.
10. Move the frame over the full range of motion for the axis noting any
changes in drag on the ball screw unit. Frame movement should be
smooth for the entire range of motion.
11. Perform steps 2 through 9 for the ball screw unit on the other axis.
12. Install the drive pulleys and their protective covers for each axis then
perform the belt tension adjustment for each axis.
End of procedure