Subject: Tooth repair?

From: [email-masked] (TUCKWOOD)
Date: 13 May 1996 23:10:13 -0400

I have been following the thread about removing a lathe chuck.
The possibility of breaking a gear tooth is very real.  I have!

Now, what is the best way to repair said broken tooth
without complete disassembly and replacement?
Is there an epoxy or something that can be used by making 
a mold of several good teeth and transferring the shape to the 
empty space?  

I would appreciate any suggestions or warnings you folks can 
offer.

Many thanks,

Jay Tuckwood

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From: "John R. Johnson" <[email-masked]>
Date: Tue, 14 May 1996 12:50:18 -0500

> I would appreciate any suggestions or warnings you folks can 

The only way I have ever been able to replace broken gear teeth with
ANY kind of longevity was with a "partial plate."  I took a piece of
cold roll bar stock and cut a pie segment with gear teeth that matched
the teeth I had to replace.  Make sure the arc of the gear is correct
also.  Then mill a matching pie segment out of the gear and braze the
replacement into place.  It is probably cheaper to just send off to
Boston Gear unless your time is REALLY cheap.
JOhn

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From: [email-masked] (Paolo Zini)
Date: 14 May 1996 13:14:10 GMT

>without complete disassembly and replacement?

I did it making a "separator" using a refractory material and rebuilding
the lost tooth using MIG weld, after I have shaped the raw material
using a similar gear as reference.
It worked ... up the first stress. at the first stress the rebuilt tooth
is gone. Now I am ordering the spare part to Myford.
I know that someone has succesfully rebuilt teeth, but I have failed.

>a mold of several good teeth and transferring the shape to the 

I have used intesively epoxy resin (for hobby projects) in the past 
and my opinion is:
                    forget it.

>I would appreciate any suggestions or warnings you folks can 

Hope this helps

Paolo Zini

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From: [email-masked] (Tom Enterline)
Date: Thu, 16 May 1996 03:51:53 GMT

My father has built up many broken gear teeth on farm machinery by
stick welding and freehand grinding.  It usually worked, but was also
usually noisy since tooth form was imperfect.