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Page 36 TECHNICAL P UBLICATIONS T46230809 Rev . C Dual Rotary Positioning Assembly - BHS This Document Supports Assembly 46230809 Advanced Support Information The following corrective maintenance procedures are intended …

Page 35

TECHNICAL PUBLICATIONS

Dual Rotary Positioning Assembly - BHS T46230809 Rev.C

This Document Supports Assembly 46230809

13. Push the START push button again to activate the rotary tables.

14. As the rotary table indexes, slowly turn the needle valve (NV1 or

NV1A) to achieve a condition in which the rotary disk stop block

firmly enters the lock assembly without causing a banging sound.

15. Push the STOP push button to stop the rotary table indexing.

16. Loosen the lock screw on the air flow control valve on the drive assem-

bly.

17. Adjust the air flow control valve fully clockwise and then two full turns

counterclockwise.

18. As the disk rotates, adjust the flow control valve so the disk movement

is quick but the stop blocks do not strike the lock assembly with exces-

sive force. The rotary disc should rotate ninety degrees in approxi-

mately one second with both discs set at the same speed.

It may be necessary to adjust the pneumatic slow down needle valve to

achieve this adjustment.

19. Tighten the lock screw on the flow control valve to secure the valve in

position.

20. Push the STOP push button.

End of procedure.

Page 36

TECHNICAL P UBLICATIONS

T46230809 Rev. C Dual Rotary Positioning Assembly - BHS

This Document Supports Assembly 46230809

Advanced Support Information

The following corrective maintenance procedures are intended for

Universal Instruments Corporation Field Service Engineers only.

Unauthorized implementation of these procedures may result in damage

to the machine and may adversely affect your warranty status if

performed by other than UIC personnel.

The advanced support information procedures are those identified on the

maintenance concept table as requiring a minimum skill level of UIC Field

Service Engineer. All such procedures may or may not be present in this

document at this time.

Y Axis Bearing Replacement Procedure

Purpose:

This procedure is presented because of the need to properly seat the duplex

bearing for the Y axis lead screw support.

The Y axis lead screw support bearing is installed at the factory and

should not require removal. If a bearing should fail and need

replacement, the following procedure should be performed by a

qualified Field Service Engineer using the proper tools.

Special Tools:

Torque Wrench (47145501)

Bearing Assembly Tool (47492101)

Spanner Wrench (47492401)

Special Wrench (46860901)

BEARING ASSEMBLY TOOL

Outer Race Support

(47513801)

Pilot

(47513601)

Puller Support

(47513701)

Bolt

(47513901

Nut

(80015003)

Washer

(80018809)

Page 37

TECHNICAL PUBLICATIONS

Dual Rotary Positioning Assembly - BHS T46230809 Rev.C

This Document Supports Assembly 46230809

Bearing Removal Procedure

1. Power down the machine as detailed in the Operation Manual and open

the rear cover of the machine.

2. Loosen the screws that secure the rear stiffener plate from the C-frame,

then remove the rear stiffener plate.

3. Loosen the two set screws in the flex coupling that secures the flex

coupling to the lead screw shaft

4. Remove the four screws, lockwashers and washers that secure the en-

coder and mounting plate assembly to the C-frame, then remove the

encoder and mounting plate assembly.

5. Loosen the four screws that secure the motor and mounting plate as-

sembly to the C-frame to relieve the tension on the drive belt. Slide the

drive belt off the pulley.

6. While holding the pulley to prevent it from turning, loosen the lock nut

and remove the lock nut and washer.

7. Loosen the set screws that secure the pulley to the lead screw shaft,

then remove the pulley, key and spacer.

8. Remove the screws that secure the dust bellow and retainer plate to the

bearing retainer and move the dust bellow out of the way.

9. Loosen the set screw that secures the bearing plug in the bearing plate,

then using the spanner tool, remove the bearing plug and plug washer.

10. Remove the two flat head screws that secure the bearing retainer and

bearing washer to the C-frame, then remove the bearing retainer and

bearing washer.

11. Remove the button head screw that secures the Y frame cover, then re-

move the Y frame cover.

12. Remove the three socket head screws that secure the bearing block at

the front of the lead screw, then remove the bearing block.

13. Move the positioning assembly toward the front of the machine until

the lead screw shaft is pulled out of the bearing.

If the lead screw turns while the positioning assembly is being moved

forward, the shaft may be stuck and require light impact to loosen it and

allow it to be pulled from the bearing.

14. Remove the duplex bearing from the C-frame, being sure not to dam-

age the bore in the C-frame. The bearing assembly tool may be used to

remove the duplex bearing.