This document, and the content contained herein, is intended for customers, users and other persons with the operation and features of the covered Hegla products. While Hegla makes every effort to include accurate and useful information, it is not possible to anticipate or address every possible situation or to account for conditions at unknown locations or interactions with unknown systems or components. Therefor, these documents must be used only for informational purposes and used in conjunction with best practices and with due care. Hegla shall not be responsible for any injuries or losses that occur as a result of the information in this document. Moreover, as products and offerings change over time, the usefulness of the information in this document may become obsolete. It is the responsibility of the reader or consumer to ensure that the information contained herein is timely and reflects the current reality of Hegla products and offerings. Hegla disclaims any and all warranties regarding the information in this document.

***Read chapter 1 of your operators manual before undertaking any work in the area of the servo motor and drive equipment.***

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When in doubt please contact Hegla service before taking action (404) 763-9700

Checking the backlash on a rack and pinion machine

Backlash affects lite sizes if the mesh is too loose. To check the backlash follow the steps below:

• First turn the override of the machine down to 0% by following the Changing the speed of the machine document. This ensures the machine cannot move while under power.
• With a dial indicator in place, push the end of the bridge with your hands back and forth. Use the dial indicator to measure the distance you can move the machine.
• The backlash should be approximately 20 to 30 thousandths of an inch.
• Do this for both X-axis pinions and the Y-axis pinion.
• Adjust if necessary.