Adjusting Gear Mesh

 

 

Like most things with slot cars, there are a few ways of achieving the same thing.

These are 2 suggestions that work, and will at least get you going.


The process is pretty much the same for setting in-line Crown and Pinion, or Spur and Pinion setups.

 

For this exercise, we will describe the sidewinder and angle winder set-ups using spur gears.

 

For inline set-ups, the motor is screwed or soldered in position first, then the Crown gear is adjusted in the same manner as described below for setting the motor, by pushing the Crown gear towards the pinion, etc.

 

a/

By Feel.

 

Set the side clearance in the axle and lock the gear and wheel/s, so the axle spins freely with excessive side play.

Hold the motor in position and engage the pinion with the spur gear, then rotate the wheels in the normal forward direction and find the tightest point of mesh. Most gears are not perfect and will sit on the axle at a slight angle which makes the gear run slightly out of round.

Once you have found the tightest position, adjust the motor for clearance so that you can feel a slight back and forth movement in the spur, but the movement is hard to see. A bit hard to explain, but you can actually feel the backlash more than you can see it.

In my simple terms, set it so that you can just feel the movement, but can't see it.

Once you get to that point, screw or solder the motor in.
 

Check the clearance to make sure nothing has moved, and away you go.

 

b/

Using a Spacer

 

Set the side clearance in the axle and lock the gear and wheel/s, so the axle spins freely with excessive side play.

To set the backlash in this method we will use spacer made from a thin piece of paper, or flexible plastic sheet about 0.05mm (0.004") thick.  You will need a piece about 6mm wide x about 25 long (or longer) so that you can handle it OK.  Have it ready for the next step.

 

As in the first method, hold the motor in position and engage the pinion with the spur gear, then rotate the wheels in the normal forward direction and find the tightest point of mesh.

Once you have found the tightest position, make note of where the grub screw in the gear is positioned, so that you can return the gear to that same point, move the motor away from the gear, then insert the spacer between the pinion and gear.

 

Push the motor firmly towards the gear clamping the spacer between the gears, while ensuring that the grub screw in the gear is in the same position as noted before.

Once you get to that point, screw or solder the motor in.
 

Remove the spacer, check the clearance to ensure it is OK, and away you go, ...hopefully.

 

It may take a bit of practice to work out what thickness spacer to use, and how hard to push the motor against the spacer, but once you get it right, you will be able to repeat the process without thinking about it too much..

 

Steve K.

 

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