Adhesives to Fix Pinion to Nut?

this or any similar product is my "almost" daily go to for "forever" fixes.

if you need something thin, regular JB, but setting takes a long time before you test it lest you wreck the piece.

clean and roughen surface if possible, but otherwise / mix a small slice in your hand , press into the parts and little extra where you can / form it in tight with your finger.

leave it overnight, and make a ball of your trimmed off bits to test for hardness later.

Maybe a modification is in order....

I had considered modifying the geared mechanism but could not see a quick fix that would last. I am still toying with the idea, metal pinions would be so much better if I could get some of the right size. Also thought of a cam under the motor to raise and lower it. Thanks for your input.

Personally, not knowing the plastic details, I'd be reluctant to go near it with any adhesive for fear of chemical interaction with the nut.

If it was originally a friction fit, I'd be looking at how to minutely increase the nut OD, maybe with five or so locally raised "splines" or some attempt to locally knurl the surface to restore the friction fit as intended while still maintaining the bearing fit as is.

after a 1001 uses I've not had and adverse chemical reactions.

If it doesn't fit, it might provide a bit of a friction fit like a custom washer.

in the rare case it won't stick, it will pull away leaving the surface cleaner than before.

...for a nickle and 5 minutes.

An expensive, but nevertheless viable option is to remove the router and use it as the portable power tool it was meant to be, and replace it with one of several commercially available routers that have above-the-table height adjustment integral to the design (You probably know about these. I mention them in case you don't). Your described router lift mechanism could then be retired.

Thanks for the reply. I had considered getting a new one but then I opened my wallet for a look see and promptly changed my mind. However the suggestion of a modification has been mentioned and I am thinking of doing away with the mechanism to raise and lower the motor in another way. I will be looking at your suggested mechanism after I catch another rabbit or two. There is no great urgency for this job. Thanks for the tips.

If there is only a small clearance between the shaft and gear,I would clean both parts with acetone.

Then roughen up both contact surfaces with coarse emery cloth.If you have an engraving tool,use it to make a random series of dimples on the shaft, and if possible,inside of the gear,which will create more surface area for the adhesive and create "keying " points for the adhesive.

The dimples will also slightly increase the diameter of the shaft.This is a shade tree way to knurl a shaft in a pinch.

I would use Loc Tite 660 Retaining compound and Activator;About the best you can do with what appears to be nylon gears.

Good luck!

I would be using one of the Loctite products that are purpose made for just this usage.

There are a number of them to choose from, ie 620, 638, 648, or 660 (my preference).

They're very likely nylon. You could try Gorilla glue or Crazy glue with a powder compound. You can file most any hard plastic or in a pinch I've used regular baking flour for the powder with the liquid glue. When it sets it's harder than the original plastic and can be filed into shape as needed. I didn't believe it until I tried it.

Loctite 601 (usual disclaimer).

I would go for belt and braces - the putty of #1 and drill a hole for pin as #2.

.... but the extra strength might cause the plastic teeth on the pinion to shear under load..

If you can find it I would use double bubble 30 min epoxy. My second choice would be

one of the J B Weld epoxies.

gshaiffer@msn,com

I have used JB weld in the past and I have had great success. It can be shaped and filed before it hardens making JB weld a great product for your application. It's used for anything from repairing engine blocks to applications such as yours. Hey try it you'll like it!