How to restore a plastic gear

In today's time, there are a lot of mechanisms around us that use plastic gears. Moreover, it can be like toy cars, and quite serious things, for example, an aerial lift in a car, a spinning gearbox, and so on. The reasons for the breakage of the gears can be different, of course most of them are associated with improper operation, but now this is not the case. Since you are in such a situation and you broke a couple of gear teeth, then there is a way they do not pay for an expensive item, but to restore it in a simple manner.

You will need to restore

  • Waste toothbrush
  • Detergent
  • Two-component epoxy adhesive -.. cold welding for plastic
. Clay cold welding should be liquid, in tubes. Be sure to look at the packaging so that it is suitable for bonding plastic and plastic parts. Such two-component glue can be bought both in the auto parts store and in the hardware store.If you have any difficulties and cannot find one, at the end of the article I will tell you how to make a similar analogue.

Restore plastic gear


First It is necessary to prepare the surface of the gear. We wash it repeatedly in warm water with detergent, actively working with a toothbrush. Our task is to degrease and remove grease from all facets. After the degreasing is done, dry it dry.

Prepare the glue

Now prepare the glue. Mix on a small piece of cardboard components in proportion as in the instructions. Mix well. Generally, before opening the glue, I recommend that you carefully read its instructions, especially with the time of complete and partial hardening, as different manufacturers may radically different data. If the consistency is liquid - let it stand for a while until it starts to harden.

Repairing teeth

In my case, several teeth have been cut off, the situation is correctable. We smear glue on that place which needs to be restored. The glue should be very thick, but plastic.
How to restore the plastic gear
Make such a peculiar knob.
How to restore the plastic gear
How to restore the plastic gear
Put the gear on the improvised stand, in order to glue even more thickened. All again, individually, it took me about 20 minutes to make the consistency noticeably thicker.
How to restore the plastic gear
You can speed up the reaction and shorten the thickening time by heating. For example, take a hair dryer and start heating the glue on the gear.
How to restore a plastic gear

Repairing teeth

Now the most crucial moment is rolling the teeth. The knot where the gear was operated, namely the other gear with which our broken one directly came in contact, it is necessary to lubricate it with plenty of grease, grease or lithol. Install the broken gear and roll several times around the other.


Gently remove the reconstructed from the mechanism and leave it for final hardening, usually for a day.
How to restore a plastic gear
In this simple way you can quite easily restore broken gears.

How to replace epoxy glue?

If you did not find the glue , I can recommend a slightly similar composition. To do this:
  • Epoxy resin with hardener.
  • Dry cement .
We buy ordinary transparent or yellowish epoxy resin with hardener.These two components are often sold together. In the proportion specified in the instructions, we mix the components to get the right amount of glue. We add cement. Only not a cement-sand mixture, namely, pure cement. The proportions are approximately two to one. That is, two parts of glue and one cement. And we mix everything very carefully. The glue is ready, and then everything follows the instructions above.

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