Gear repair

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Pitufo
Posts: 260
Joined: Sun Jun 21, 2015 4:32 am
Location: United Kingdom

Gear repair

Post by Pitufo »

Does any one have a suggestions on the best way to make these two parts one functioning part again?

As you might have guessed - internal gear from a focus drive (Mitutuyo FS-60). I can't tell exactly how it was joined in the first place but possibly just pressed together somehow (these two-part gears always seem like a weak point to me).

The only thing I can think that may be strong enough is some kind of micro welding but that is outside of my current capabilities (but I'm always happy to experiment/invest).

I guess they are made of steel and brass but correct me if I'm wrong.

Any help appreciated. If anyone has a spare, even better!

Image
Last edited by Pitufo on Sun Mar 01, 2020 9:53 am, edited 2 times in total.

lothman
Posts: 959
Joined: Sat Feb 14, 2009 7:00 am
Location: Stuttgart/Germany

Post by lothman »

degrease ist and glue it with retaining adhesive like those Loctite products:
https://www.henkel-adhesives.com/de/en/ ... ounds.html

Pitufo
Posts: 260
Joined: Sun Jun 21, 2015 4:32 am
Location: United Kingdom

Post by Pitufo »

Thank you Lothman - that is an excellent suggestion.

I wasn't aware of those products.

P.S. I've ordered some Loctite 638, so will add a progress report.

P.P.S. Title edited to make more sense.
Last edited by Pitufo on Thu Feb 27, 2020 5:08 am, edited 1 time in total.

lothman
Posts: 959
Joined: Sat Feb 14, 2009 7:00 am
Location: Stuttgart/Germany

Post by lothman »

:D
I sell Loctite 638 (gap filling ability) together with my Nikon Labophot fine focus spur gears. Those products are excellent at metal/metal contact, especially when one partner is made of steel.

Pitufo
Posts: 260
Joined: Sun Jun 21, 2015 4:32 am
Location: United Kingdom

Post by Pitufo »

The Loctite 638 worked like a dream. Amazing stuff.

I would recommend taking a lot of care removing any excess adhesive from between the teeth as some of this was still liquid after 24 hours (I used a hypodermic needle and tissue under a stereo). If this unreacted adhesive was reassembled with other gears it might set in the absence of oxygen.

Thanks again Lothman - great tip :D

Kind regards,

John

Len Willan
Posts: 111
Joined: Sun Mar 22, 2009 9:52 pm
Location: Como West Sydney Australia
Contact:

Post by Len Willan »

Hello Pitufo,
You are very fortunate of being in the UK, where for 400 years the standard repair for a stripped Brass Wheel and Steel Pinion is to rebush the wheel.
Here is a link on rebushing, parts easily available in your part of the world
https://www.google.com/search?as_q=&as_ ... as_rights=
As any English watch / clockmaker would say
“ Don’t ruin the good ship for two penneth of tar”
“Down Under” we purchase from some of the listed places.
Always avoid the Quick Fix and Repent Later.
Len

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