46230812.pdf - 第31页
Page 29 TECHNICAL PUBLICATIONS DH Positioning System Assembly , P/T T46230812 Rev . D This Document Supports Assembly 46230812 X and Y Axes Gear Belt T ension Adjustment Procedure Purpose: X - Y Axes gear belts transfer …
Page 28
TECHNICAL PUBLICATIONS
T46230812 Rev. D DH Positioning System Assembly, P/T
This Document Supports Assembly 46230812
LOW PROFILE
WRENCH
TORQUE
ADAPTER
TORQUE
GAGE
SOCKET HEAD
CAP SCREW
SOCKET HEAD
CAP SCREW
(LOCATED UNDER
THE
BRACKET)
SWITCH
BRACKET
Rotary Disk Lock Assembly
SOCKET HEAD
CAP SCREWS
18. Remove the locator pins and rotate the rotary disk one full revolution
to settle in the guide wheels.
19. Reinsert the locator pins into the locator holes and check that the
locator pins slide into and out of the holes. If they do not, repeat steps
9 through 18 until the locator pins fit properly.
20. Install the four stop blocks on the rotary disk assembly.
21. Remove the screws that secure the switch bracket on the lock assembly
and remove the switch bracket.
22. Loosen the socket head cap screws shown that secure the lock
assembly to allow adjustment of the lock assembly.
23. Insert the locator pins into the locator holes.
24. Manually move the lock assembly until the locator pins slide with even
force into the alignment holes.
25. In a diagonal pattern, tighten the socket head cap screws which secure
the lock assembly, 1/8 of one revolution per screw until the screws are
fully tightened.
26. With the locator pins removed, disengage the stop block from the lock
assembly then turn the rotary disk to securely engage the rotary disk
stop block into the lock assembly.
27. Check that the locator pins slide into and out of the locator holes.
28. If the locator pins do not slide into and out of the locator holes, repeat
steps 22 through 27 until they fit properly.
29. Replace the switch and bracket on the lock assembly and secure it in
position with the socket head cap screws.
30. Adjust the switch on the lock assembly so the switch actuator is
depressed.
31. Reposition the rotary disk drive assembly stop plate and secure it in
place with the socket head cap screws. Ensure the rotary disk is
centered in the V-groove of the rotary disk drive assembly drive wheel.
32. Check that the locator pins slide into and out of the locator holes.
33. Remove the locator pins from the rotary table locator holes.
34. Ensure the locking brackets do not extend over the rotary disk then
tighten the button head cap screws securing each locking bracket in
position.
35. Replace any covers and/or assembly components that were removed to
allow access to the guide wheel assemblies.
End of procedure.
Page 29
TECHNICAL PUBLICATIONS
DH Positioning System Assembly, P/T T46230812 Rev. D
This Document Supports Assembly 46230812
X and Y Axes Gear Belt Tension Adjustment
Procedure
Purpose:
X - Y Axes gear belts transfer motion from the motor assembly to the ball
screw unit which in turn moves the X or Y axis table positioning the printed
circuit board for component insertion. Due to the high degree of accuracy
required for component insertion and the speed between insertions, gear belts
must be kept at optimum tension. If the gear belt tension is too loose, table
over travel and therefore component misinsertion results. If the gear belt
tension is to tight, excessive gear belt and bearing wear results.
Comments:
This procedure is applicable to gear belt replacement and during gear belt
wear, resulting in gear belt stretch.
Because new belts stretch after approximately 150 hours of machine
operation, the gear belt tension must be reset after the initial 150 hours
of machine operation.
Gear Belt Tension Adjustment
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. Ensure the belt is correctly seated into both pulleys by rotating the
pulleys several rotations. This can be accomplished by moving the
appropriate axis by hand.
3. Loosen the three motor mounting bracket screws and allow the spring
mechanism in the encoder mounting plate to apply a force against the
side of the motor. The force is applied away from the lead screw
pulley and along the line between the centers of the pulleys.
4. With the force applied, again ensure the belt is correctly seated into
both pulleys by rotating the pulleys several rotations. This can be
accomplished by moving the appropriate axis by hand.
5. While the spring mechanism maintains the required force against the
side of the motor, tighten the three motor mounting bracket screws.
End of procedure.
Page 30
TECHNICAL PUBLICATIONS
T46230812 Rev. D DH Positioning System Assembly, P/T
This Document Supports Assembly 46230812
Gear Belt Replacement
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. Loosen the screws at the edge of the encoder mounting plate. This
action unloads the springs that apply pressure to the dowel pins.
3. Remove the three mounting screws that secure the motor mounting
bracket to the motor mount and carefully remove the motor and motor
mounting bracket assembly.
4. Loosen the two encoder coupling screws on the ball screw end of the
coupling, but do not remove.
5. Remove the screws on the encoder cover assembly and remove the
cover assembly.
6. Replace the gear belt.
7. Replace the encoder cover assembly, ensuring that the attached
coupling is mated to the ball screw shaft, then tighten the screws in the
encoder cover assembly.
8. Tighten the two screws in the ball screw end of the encoder coupling.
9. Install the motor and motor mounting plate assembly using the three
screws. Leave the screws loose enough to allow the dowel pins to
supply the correct tension.
10. Ensure that the gear belt is correctly seated in both gear belt pulleys by
rotating the pulleys several rotations. This can be done by moving the
appropriate axis by hand.
11. Tighten the screws at the edge of the encoder mounting plate so they
compress the springs which then apply a load to the dowel pins.
Ensure the motor is pushed away from the ball screw when the dowel
pins apply a load to the motor mounting bracket.
12. With the tension applied, again ensure that the gear belt is correctly
seated in both gear belt pulleys by rotating the pulleys several rotations.
13. Tighten the three screws on the motor mounting bracket.
End of procedure.