This article applies to:

D series with all laser modules.

Issue description:

When you engrave something with D series machines under "Open plane" mode, you may find the machine engraves a wavy or distorted line when it's supposed to be straight, as shown in the picture below.

To reproduce the issue to confirm, you can engrave a big square and see if the lines on the X-axis and Y-axis are wavy.

If the lines on the X-axis are wavy

Why it happens

Possible causes may include:

1. Improper tension in the X-axis timing belt.
2. The guiding rail on the X-axis is deformed, or it may have obstacles or signs of wear.
3. Loose Z-axis plate.
4. Damaged U-type bearings.

How to fix it

#1 Adjust the X-axis timing belt

1. Check the belt's tightness and ensure the tension is adjusted properly.
2. For detailed steps, please refer to this guide for further assistance.

#2 Check the X-axis rail

1. Check the guiding rail for any obstacles.

• If any are found, remove them.

3. If the rail is deformed or damaged, replace it.

#3 Check the Z-Axis Plate

1. Check if the plate is loose.
2. If yes, refer to this guide or the video tutorial below and adjust the tightness of the plate.

#4 Replace the U-type bearings

If the bearings are damaged or wrong in size, please contact tech support for further advice.

If the lines on the Y-axis are wavy

Why it happens

Possible causes may include:

1. Incorrect tension in the Y-axis timing belt.
2. Deformation, obstacles, or signs of wear on the Y-axis guiding rails.
3. Shaft deformation or loose coupling.

How to fix it

#1 Adjust the Y-axis timing belts

1. Check the belts' tightness and ensure the tension is adjusted properly.
2. For detailed steps, please refer to this guide or the tutorial below for further assistance.

#2 Check the Y-axis rails

1. Check the guiding rails for any obstacles.

• If any are found, remove them.

2. Check for rust and wear on the guide rail and apply rail grease for maintenance.

• Refer to this article or the video below for guidance on lubrication:

3. If the rail is deformed or damaged, replace it.

#3 Check the drive shaft

1. Make sure that the coupling is tightened properly and that the two ends of the shaft are fitted in place.
2. Check if the drive shaft (aka the optical shaft) is bent or damaged.

• If so, it may need to be replaced. Please contact tech support for advice.

Note: Please leave some space between the coupling and the motor, as shown in the photo below.

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