Service BMT Live Tooling Troubleshooting Guide
Last updated: 02/17/2020

BMT Live Tooling Troubleshooting Guide

Introduction

100% duty cycle at 4500 RPM.

15% duty cycle at 6000 RPM.

 

Symptom Table

Symptom Possible Cause Corrective Action
Live Tooling Alarms 11.993, 11.103, and 11.9959 The servo motor has a fault Refer to the Sigma 5 Servo Motor Troubleshooting Guide.
The amplifier has a fault.

Refer to the Amplifier Troubleshooting Guide.

Note: If a short-circuit is found, inspect the cable and motor for a short circuit before installing a new amplifier.
Noise/Vibration The drive is out of alignment. Re-align the live tooling drive.
A drive bearing has failed. Perform a Vibe Test.

Amplifier Short Circuit Inspection

Check the amplifier for a short. Power off the machine. Disconnect the cables for the axis servo motor at the amplifier that generates the alarm.

Place MultiMeter Leads Here Instructions

Set the meter to ohms, and take the following readings:

Ground screw to RED, WHT, and BLK terminals

If the meter does not show open (o.l) the amplifier is damaged.

Set the meter to Ohms, and take the following readings:

Black lead on HV (+) and Red lead to HV (-), RED, WHT, and BLK terminals

If the meter does not show mega ohms or higher the amplifier is damaged.

Set the meter to diode test mode, and take the following readings:

Red lead on HV (-) and black lead to HV (+), RED, WHT, and BLK terminals

If the meter does not show a voltage drop ranging from 0.2 to 0.8 volts the amplifier is damaged.

Set the meter to diode test mode, and take the following readings:

Black lead on HV (-) and red lead to HV (+), RED, WHT, and BLK terminals

If the meter does not show an open circuit (O.L) the amplifier is damaged.

Servo Motor Short Circuit Inspection

Corrective Action:

Check the cables for a short: Make sure the axis servo motor cables are not contaminated or pinched. Contaminated or pinched cables can cause a short. Replace the cables if necessary.

Inspect the servo motor. Disconnect and inspect the power cable connector at the motor. Make sure that there is no coolant contamination. Coolant contamination can cause this alarm and damage the amplifier. Measure the resistance from the pins labeled A, B and C at the motor connector to chassis ground.

  • The reading should show an open circuit.
  • If there is not open resistance, the servo motor is at fault.

Drive Alignment

Run the live tooling without a driven tool in place. If the noise is gone or reduced check the live tooling drive alignment. 

Follow the alignment procedure fully. 

Vibration Analyzer

For a detailed procedure see BMT Live Drive Turret Vibration Test

Install an empty live tool holder in tool #1. Install the accelerometer on the driven tool.

Set the Averages to 8.

Right click on the plot and highlight X-Axis, click on CPM.

Right click on the plot and highlight Y-Axis, click on Vibration Displacement.

Right click on the plot and highlight Y-Axis, Scaling, click on .1 mil.

 

Run the live tooling at 6000 RPM and start the vibe test. NTE 0.01 MIL at 6000 CPM (RPM)

If the plot is out of tolorance, re-align the drive and test again.

Use another driven tool to verify that it is not causing the issue.

Verify alignment with the correct tooling before any parts are replaced.

 

Possible parts that cause vibration are the bearing and live drive shaft or the servo motor and coupler.  Another cause could be a coolant leak in the turret.  Verify that no coolant is found in the turret if replacing parts.  Coolants leaks happen if there is porosity in the turret.

 

 

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