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Crashed BMT Drive Replacement - AD0451

Service How To Procedures Crashed BMT Drive Replacement - AD0451
Recently Updated Last updated: 11/12/2020

Crashed BMT Drive - Replacement - AD0451


AD0451

Crashed BMT Drive Replacement - AD0451

- Jump to Section - 1. Introduction 2. Replacement (10 steps) Back to Top

Introduction

Follow these instructions to replace the live tool drive in the BMT turret after a live tooling crash.

Tools Required:

  • T-0080 BMT65 MASTER ALIGNMENT BLOCK
  • T-0081 BMT65 LIVE TOOL ASSEMBLY PRELOAD TOOL
  • T-0082 BMT65 ALIGNMENT INDICATOR HOLDER
  • T-0083 BMT65 OUTPUT SHAFT ALIGNMENT TOOL
  • T-0112 BMT LIVE DRIVE TORQUE TUBE REMOVAL TOOL

Replacement

1

Remove all tooling from the turret, index to tool #1, and disable the A-Axis and live tooling motors.

Remove the following items in this order:

  • The live tool and turret servo motors [1].
  • The top and bottom alignment bushings [2].
  • The rear turret gearbox cover [3] (liquid grease will drain).

2

If equiped with live tooling, remove the torque arm [1] with a set screw and ball bearing in the following order:

  • Loosen the jam nut [2].
  • Remove the set screw [3] and steel ball [4].
  • Loosen the two clamp bolts [5].

 NOTE: If needed, install two 5/16-18 bolts in the jack screw holes [6] next to the clamp bolts. Apply just enough torque to spread the torque arm so it can slide off the torque tube.

 NOTE: In the event of a live tool crash the torque arm may be difficult to remove. A pulley puller may be used. If the torque arm still cannot be removed cut it off the torque tube with a grinder. If a grinder was used remove the gears from the turret housing, throughly clean them and the turret housing.

Remove the torque arm.

Remove the snap ring from the torque tube.

3

To remove the torque arm [1] with set screws, remove the following items in this order:

  • Remove the set screws [2]
  • Loosen the two clamp bolts [3].

Remove and discard the torque arm.

 NOTE: If the set screws are difficult to remove, use a blow torch to apply localized heat to the set screws to soften the loctite.

 NOTE: If needed, install two 5/16-18 bolts in the jack screw holes [4] next to the clamp bolts. Apply just enough torque to spread the torque arm so it can slide off the torque tube.

 NOTE: In the event of a live tool crash the torque arm may be difficult to remove. A pulley puller may be used. If the torque arm still cannot be removed cut it off the torque tube with a grinder. If a grinder was used remove the gears from the turret housing and throughly clean them and the turret housing.

4

Remove the number ring [1] and live tool drive bracket [2].

Remove the (6) bolts from the retaining ring [4] and slide the live tooling drive [3] out of the turret.

Clean the bore and reinstall the shims [5].

 

5

Visually inspect the input [1] and output [2] shaft of the live drive.

If either shaft is damaged the entire live drive assembly must be replaced.  Refer to: BMT Drive - Replacement

If there is no damage to the input and output shafts proceed to step 6.

6

Remove the (6) bolts [1] from the live drive assembly.

Install T-0112 [2] BMT LIVE DRIVE TORQUE TUBE REMOVAL TOOL onto the torque tube such that it clamps onto the torque tube shoulder [3].

Evenly tighten the jack bolts [4] until the torque tube is free of the live drive assembly.  Discard the damaged torque tube.

7

Use a press or mallet to install the dowel pins [1] into the new torque tube.

Orient the torque tube on the live drive assembly so that the torque tube ball bearing slot [3] faces the live drive output shaft [2].

Install the torque tube using the (6) bolts [4].

8

Install the O-Ring [1] onto the OD groove at the input end of the torque tube.

Use T-0113 [3] to install the bearing into the torque tube [2].

Install the wave washer [4] and snap ring [5].

Install the live drive assembly into the turret.

Roughly align the drive head to tool #1

9

To replace the torque arm [1] with a set screw and ball bearing:

Install the snap ring on the torque tube.

Place the torque arm with the springs on the torque tube. Install the steel ball [2] and set screw [3] with light torque to align the two pieces. Back off the set screw 1/8th of a turn.

Install the T-0081 preload tool [1] on the turret housing.

Remove the jack screws from the threaded holes [5] if used.

Tighten the set screw [3] with Loctite (blue 242) to 10 ft-lb. Lock the jam nut [4] to 35 ft-lb.

Torque the two clamp bolts [6] to 80 ft-lb.

Follow the alignment procedure before installing the rear gearbox cover.

ALIGNMENT PROCEDURE

10

To replace the torque arm [1] with set screws:

Tighten the set screws [2] with Blue Loctite and torque to 30 ft-lbs.

Install the two clamp bolts [3] with 80 ft-lb of torque.

Install the rear turret gearbox cover and alignment bushings.

Follow the alignment procedure before installing the rear gearbox cover.

ALIGNMENT PROCEDURE

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