Belt Tension Inspection and Adjustment

Model [X] AON-M2 [X] AON-M2 2020
Category [X] Preventive [X] Corrective [ ] Troubleshooting

Summary

The procedure that follows explains how to check the belt tension for all axes and provides instructions on how to adjust the tension as necessary.

Tools

Qty Description Specification
1 Sonic Tension Meter Gates Unitta Asia U-508
1 Hex Key 4 mm
1 Wrench 8 mm, open
1 Wrench 10 mm, open
1 Spacer 6 mm thick, aluminum

The Gates Unitta Asia U-508 sonic tension meter is available on loan to our Success Plan customers to help with the belt maintenance of the AON-M2. Rental options are also available. Please reach out to our Customer Success team at help@aon3d.com for more details on how to obtain the Gates Unitta Asia U-508 sonic tension meter.

Parts Information

None required.

Personal Protective Equipment

Qty Description Specification
1 Safety Eyewear N/A
A/R Gloves Nitrile

Prepare the Machine

  1. Home XYZ.
  2. Lower the Z-axis by 300 mm.
  3. Push the E-stop button, switch off the power, and unplug the machine.
  4. Wait until the build chamber, build plate and hot ends are at room temperature.

Prepare the Sonic Tension Meter

Setup Sonic Tension Meter

  1. Remove the sonic tension meter and flexible sensor from the shipping box.
  2. Install the flexible sensor onto the sonic tension meter.
  3. Press the POWER button to turn on the sonic tension meter.

If using a sonic tension meter other than the Gates Unitta Asia U-508 loaned out by AON3D, user must set up the sonic tension meter with the parameters from the table below.

Axis Mass (M) Width (W) Span (S) Preset No.
X 1.4 g/m 9 mm/R 600 mm 1
Y 1.4 g/m 9 mm/R 640 mm 2
Z 1.4 g/m 9 mm/R 171 mm 3

Check X-Axis Belt Tension

Allow all machine components to reach room temperature prior to proceeding further. Failure to allow components to cool down will result in thermal injury (burns) to personnel.

Disconnect the power cable found at the back of the machine. Failure to do so will result in damaging the electronics, and void the AON3D warranty.

  1. Open the build chamber door.
  2. Make sure that both toolheads are at each extremity on the X-axis linear rail (T0 on the far left and T1 on the far right).
  3. Press the 1 button on the sonic tension meter to select the X-axis belt tension test.
  4. Position the flexible sensor of the sonic tension meter as near to the center of the X-axis belt as possible. Do not let the sonic tension meter sensor touch the belt. Sonic Tension Meter X-Axis Belt

    Do not tap the belt at the ends. This will result in incorrect results. The X-axis belt must be tapped in the center to record accurate results.

  5. Press the MEASURE button on the sonic tension meter, and tap the center of the X-axis belt lightly with a finger. Record the belt tension value.
  6. Do step 5 a total of three times and note all the recorded tension values. Calculate the average of the three recorded tension values.
  7. If the average of the three recorded belt tension values is not in the permitted 30 N (± 5 N) range, do procedure Adjust X-Axis Belt Tension.

Check Y-Axis Belts Tension

The AON-M2 uses two Y-axis belt tensioners. To help with print quality and machine reliability, the two Y-axis belt tensioners require periodic inspection and adjustment.

  1. Manually push the Y-axis gantry to the back of the machine.
  2. Press the 2 button on the sonic tension meter to select the Y-axis belt tension test.
  3. Position the flexible sensor of the sonic tension meter as near to the center of the right Y-axis belt as possible. Do not let the sonic tension meter sensor touch the belt. Sonic Tension Meter Y-Axis Belt

    Do not tap the belts at the ends. This will result in incorrect results. The Y-axis belts must be tapped in the center to record accurate results.

  4. Press the MEASURE button on the sonic tension meter, and tap the center of the right Y-axis belt lightly with a finger. Record the belt tension value.
  5. Do step 4 a total of three times and note all the recorded tension values. Calculate the average of the three recorded tension values.
  6. If the average of the three noted tension values is not in the permitted 30 N (± 5 N) range, do procedure Adjust Y-Axis Belts Tension.
  7. Do steps 3 to 6 for the Y-axis belt found on the left side of the machine.

Check Z-Axis Belt Tension

  1. Press the 3 button on the sonic tension meter to select the Z-axis belt tension test.
  2. Position the flexible sensor of the sonic tension meter as near to the center of the right Z-axis belt as possible. Do not let the sonic tension meter sensor touch the belt. Sonic Tension Meter Z-Axis Belt

    Do not tap the belts at the ends. This will result in incorrect results. The Z-axis belts must be tapped in the center to record accurate results.

  3. Press the MEASURE button on the sonic tension meter, and tap the center of the right Z-axis belt lightly with a finger. Record the belt tension value.
  4. Do step 3 a total of three times and note all the recorded tension values. Calculate the average of the three recorded tension values.
  5. If the average of the three noted tension values is not in the 20 N (± 5 N) range, do procedure Adjust Z-Axis Belt Tension.
  6. Do steps 2 to 5 for the Z-axis belt found on the left side of the machine.

Adjust X-Axis Belt Tension

Adjust X-Axis Belt Tension

The X-axis belt tension can be adjusted from either the left or the right X-axis belt tensioner. In the procedure that follows, the left X-axis belt tensioner is used as an example.

  1. Manually pull the Y-axis gantry to the front of the machine.
  2. Use the 4 mm hex key to loosen X-axis belt block socket flathead screw (1). Do not remove the socket flathead screw (1).
  3. Use the 10 mm open wrench to loosen X-axis belt jam nut (2).
  4. Use the 10 mm open wrench to tighten or loosen the X-axis belt block adjustment screw (3) as necessary.
  5. Do procedure Check X-Axis Belt Tension.
  6. When the X-axis belt tension is set to 30 N (± 5 N),
    1. use the 4 mm hex key to tighten the socket flathead head screw (1).
    2. use the 10 mm open wrench to tighten the jam nut (2).
  7. Do procedure Check X-Axis Belt Tension.
  8. If X-axis belt tension is not in the permitted 30 N (± 5 N) range, do steps 2 to 7 as necessary.
  9. Once belt tension is set, make sure the socket flathead screw (1) and the jam nut (2) are tight.

Adjust Y-Axis Belts Tension

Adjust Y-Axis Belt Tension

The Y-axis idlers belt tensioners must be adjusted on both left or the right sides. In the procedure that follows, the left Y-axis belt tensioner is used as an example.

  1. Manually push the Y-axis gantry to the back of the machine.
  2. Use the 10 mm open wrench to loosen the jam nut (1).
  3. Use the 10 mm open wrench to tighten or loosen the adjustment screw (2) as necessary.
  4. Do procedure Check Y-Axis Belts Tension.
  5. When the Y-axis belt tension is set to 30 N (± 5 N), use the 10 mm open wrench to tighten the jam nut (1).
  6. Do procedure Check Y-Axis Belts Tension.
  7. If Y-axis belt tension is not in the permitted 30 N (± 5 N) range, do steps 2 to 6 as necessary.
  8. Do steps 1 to 7 for the Y-idler assembly found on the right side.

Make sure that the left and right Y-axis belt tensions are ± 10 N from each other.

Adjust Z-Axis Belt Tension

AON-M2 Cable Carrier Cover vs AON-M2 2020 Cable Carrier Cover Identify if the machine is an AON-M2 or an AON-M2 2020. Look at the Cable Carrier Cover found at the back of the build chamber.

Adjust Z-Axis Belt Tension - AON-M2

Adjust Z-Axis Belt Tension

The Z-axis belts must be adjusted on both left or the right sides. In the procedure that follows, the right Z-axis belt is used as an example.

  1. Use the 8 mm open wrench to loosen the jam nut (2).
  2. Insert the aluminum spacer (4) between the Z-axis motor and the Z-axis adjustment screw (3). Hold the aluminum spacer (4) in this position.
  3. Use the 8 mm open wrench to position the adjustment screw (3) against the aluminum spacer (4). Do not tighten the adjustment screw (3) at this time.
  4. Use the 4 mm hex key and the 8 mm open wrench to loosen the four socket head screws (1) which secure the Z-axis motor top plate.
  5. Use the 8 mm open wrench to tighten or loosen the Z-axis adjustment screw (3) as necessary.
  6. Do procedure Check the Z-Axis Belt Tension.
  7. When the Z-axis belt tension is set to 20 N (± 5 N), use the 4 mm hex key and the 8 mm open wrench to tighten four socket head screws (1).
  8. Use the 8 mm open wrench to loosen the Z-axis adjustment screw (3).
  9. Remove the aluminum spacer (4).
  10. Do procedure Check the Z-Axis Belt Tension.
  11. Use the 8 mm open wrench to tighten the jam nut (2).
  12. If Z-axis belt tension is not in the permitted 20 N (± 5 N) range, do steps 4 to 9 as necessary.
  13. Do steps 1 to 11 for Z-axis assembly found on the left side.

Make sure that the left and right Z-axis belt tensions are ± 10 N from each other.

Adjust Z-Axis Belt Tension - AON-M2 2020

Adjust Z-Axis Belt Tension

The Z-axis belts must be adjusted on both left or the right sides. In the procedure that follows, the right Z-axis belt is used as an example.

  1. Use the 4 mm hex key and 8 mm open wrench to loosen the four socket head screws (1).
  2. Use the 8 mm open wrench to loosen the jam nut (2).
  3. Use the 8 mm open wrench to tighten or loosen the Z-axis adjustment nut (3) as necessary.
  4. Do procedure Check the Z-Axis Belt Tension.
  5. When the Z-axis belt tension is set at 20 N (± 5 N), use the 4 mm hex key and 8 mm open wrench to tighten the four socket head screws (1).
  6. Use the 8 mm open wrench to tighten the jam nut (2).
  7. Do procedure Check the Z-Axis Belt Tension.
  8. If Z-axis belt tension is not in the permitted 20 N (± 5 N) range, do steps 3 to 7 as necessary.
  9. Once belt tension is set, make sure the jam nut (2) and the Z-axis adjustment screw (3) are tight.
  10. Do steps 1 to 9 for Z-axis assembly found on the left side.

Make sure that the left and right Z-axis belt tensions are ± 10 N from each other.

Test and Return to Service

  1. Make sure all tools are removed from the build chamber.
  2. Plug in the machine and power on the machine using the switch located at the back.
  3. Close the chamber door.
  4. Release the E-stop button.
  5. Home XYZ.
  6. Move all axes in all directions. If any unexpected behaviors or noises occur, check and adjust all the belts as necessary.
  7. Remove the flexible sensor from the sonic tension meter.
  8. Put the sonic tension meter and flexible sensor into the shipping box.
  9. Return the sonic tension meter to AON3D.

Please reach out to our Customer Success team at help@aon3d.com for detailed instructions on how to return the sonic tension meter to AON3D.

Last modified: July 2, 2021