Mitre Gears

Our miter gears have been rated for extreme industrial applications and we’re confident that they will last a lifetime in the HG-1. The only maintenance required is an occasional cleaning and lubrication.

The miter gears are located inside the gearbox and are easily accessible by removing either the right or left gearbox panel. We recommend removing the left panel so the grab handle won’t obstruct access. Use the included 1.5 mm hex key to remove the screws in the four corners of the panel. These screws are very small so be sure to put them someplace safe where you can find them again.

NOTE: Use care when removing the panels. A panel is held in place by four screws and can easily fall and dent the aluminum when the last screw is removed. Hold the panel in place with one hand, while removing the last screw. Place a soft towel under the gearbox to catch any parts that might fall accidentally.


With a clean rag, wipe off any old lubrication remaining on the gears. Slowly turn the flywheel to access all faces of the gear teeth. Be careful not to get your fingers caught in the gears! Once the gears are clean, add a small amount of fresh lubricant to the gears. Once again, slowly turn the flywheel to access all faces of the gear teeth.

Test the gears by giving the flywheel a slow spin. Replace the panel and screws.

Trouble Shooting

Gear sets have been designed to accommodate movement or play before engaging. This is commonly referred to as backlash. The HG-1 flywheel should be able to be turned 1° to 3° before the main shaft begins to move, this is normal behavior.

If you’re hearing an excessive amount of noise from the gearbox above normal the miter gears might need to be adjusted. Please bear in mind, the gear set is hardened steel so a rumbling noise can be considered appropriate.

To adjust the amount of backlash between the gears, fist follow the instructions above to open the Gearbox Panel.


  1. Using a metric hex key, loosen the set screw(s) holding the miter gear to the shaft. Depending on the model of your HG-1, the miter gear will have either 1 or 2 set screws.
  2. If you are adjusting the miter gear attached to the main shaft, move it vertically to adjust the backlash. If you are adjusting the miter gear attached to the flywheel shaft, move it horizontally to adjust the backlash. Only adjust one gear at at time.
  3. Moving a gear closer to it’s mate, reduces the amount of backlash. Moving a gear further from it’s mate, increases the amount of backlash. The HG-1 should have between 1° to 3° of backlash to work correctly.
  4. Tighten the set screws and then rotate the flywheel to gauge the amount of backlash applied.
  5. CAUTION: keep your fingers clear of the gears while moving the flywheel. Serious injury may occur.
  6. Close the panel when complete.