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Old Apr 14, 2008, 07:37 AM
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advice needed - attaching plastic gear to metal shaft

Hi,

I CA'd a small didel gear on a 1mm metal shaft.
The CA just slips after a short time. I'v tried
grooving the shaft a bit with the dremel, so that
some CA would stay inside when I glue the gear on..
But still it slips...

Any secret techniques ?
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Old Apr 14, 2008, 07:44 AM
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Epoxy, araldit rapid.
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Old Apr 14, 2008, 08:05 AM
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If it's a tight fit other than just slipping on the shaft a bit, try cleaning the shaft very well with solvent like acetone & then use RED loctite on it. That's worked for me in the past. I would suggest trichloroethylene as a solvent because it's one of the best degreasers there is without leaving a residue but it's a little volotile & most people don't have access to it.
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Old Apr 14, 2008, 08:30 AM
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Will do !
I will scrape the shaft with a knife, so all outer layer
will be off, and clean with alcohol /acetone

Thanks for the tips
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Old Apr 14, 2008, 09:29 AM
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You should try cleaning the gear as well because those plastic gears usually will have some mold release on them. But make sure you use something that's not going to attack the plastic. And when you apply loctite, don't use a lot of it. Once you've gotten the loctite in & the gear back on, set it aside for a while to dry.
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Old Apr 14, 2008, 09:47 AM
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welp...

took a new didel gear that is a very tight fit on the
1mm shaft, scraped the shaft (one with the dremel dents)
and cleaned with some wierd purple nail remover
from the missu's drawer + alcohol after...

then dropped a drop of CA into the gear's hole and pressed in
the shaft (i think the shaft went ~75% of the way)

For now it holds...

Cheers!
-RR
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Old Nov 17, 2015, 10:19 AM
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Goop

Use Goop (E6000) adhesive.


First use q-tip with a tiny bit of soap to mix with any oil/grease on shaft. Then use water to remove soap. Then dry the shaft.
Put as much Goop on the shaft and sides (not gear part) as you can, tapering it from the side of the gear down to the shaft. Let dry and then build this fillet up with several coats after drying.
If the design allows, let some Goop bleed into the edge of the gear teeth for a better bite.


Is much stronger then just gluing the shaft to the gear.
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