Why is My Rotary Table Losing Accuracy?

Introduction

Over time, you may notice your machined parts are falling out of tolerance. Before replacing the table, check these common causes for accuracy loss.

1. Increased Backlash

Backlash is the lost motion when changing direction. For roller cam tables, backlash is usually near zero and adjustable. If you notice backlash, it may indicate wear on the cam or rollers, or a loose drive connection.

2. Improper Installation

If the rotary table is not properly indicated (dialed in) to the machine's X or Y axis, parts will be machined at an angle. Always re-check the alignment after a minor crash or heavy machining.

3. Contamination

Ingress of cutting fluid or fine metal chips into the internal mechanism can damage the bearings or the cam surface. Ensure seals are intact and check the oil quality regularly.

4. Controller Issues

Sometimes the mechanical table is fine, but the CNC controller parameters (e.g., gear ratio or compensation values) have been altered. Check your machine parameters.

Conclusion

Diagnosing accuracy issues requires a systematic approach. If you need help troubleshooting, our engineering team is available to assist.