2025/02/03
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Backlash is a common issue that can affect the accuracy of CNC router machines. It occurs due to small gaps between mechanical components, particularly between the motor and the rack. Even the slightest misalignment can lead to noticeable inaccuracies in machining. Therefore, proper backlash adjustment is crucial to ensuring precise operation.

In this tutorial, we will guide you through the process of eliminating backlash using the Wattsan M1 1313 CNC router as an example.

Wattsan M1 1313 CNC router

What is backlash?

Backlash refers to the unwanted gap or play between mechanical components that causes minor shifts during operation. In CNC router machines, this gap is usually found between the helical pulley and the rack, which can lead to unintended movement of the gantry. To ensure stability and accuracy, backlash must be adjusted and minimized.

The adjustment process involves repositioning the motor to ensure a tight fit against the rack, preventing any unintended motion.

Wattsan backlash adjustment guide

Step-by-step backlash adjustment

Step 1: loosening the motor bolts

Locate the motor behind the plate that supports the gantry. Loosen all four bolts securing the motor to allow it to move freely. Once the bolts are sufficiently loosened, the motor should naturally lower itself slightly.

Wattsan backlash adjustment guide

Step 2: raising the motor

Lift the motor as high as possible, pressing it firmly against the rack. It is recommended to perform this step near the gantry to ensure the gear engages evenly with the rack, minimising any potential misalignment.

Step 3: securing the motor in position

Once the motor is fully raised, it needs to be locked in this position. One effective method is to sit down and apply downward pressure with your foot while using your hands to tighten the four bolts. This ensures that the motor remains tightly pressed against the rack during the tightening process.

Step 4: checking the adjustment

After securing the motor, check the results by slightly shaking the machine’s gantry. If the adjustment was successful, the gantry should remain completely stationary without any noticeable movement.

Wattsan backlash adjustment guide

Conclusion

By following these steps, you can effectively eliminate backlash and significantly improve the precision of your CNC router machine. Regular maintenance and periodic checks will help maintain optimal performance and prevent future misalignment issues. Proper backlash adjustment ensures that your machine operates with maximum accuracy, enhancing the quality of your work.

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