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Re: [OM] Cleaning an OM300/Bounce Grip repair

Subject: Re: [OM] Cleaning an OM300/Bounce Grip repair
From: "Giles" <cnocbui@xxxxxxxxxxxxx>
Date: Sun, 28 Mar 1999 00:56:36 +0000

I have had little luck just gluing a crack in a plastic part if it originated 
from 
stress.  Usually you get a crack because the area is highly stressed and most 
glues 
have little mechanical strength in their own right or the strength of their 
bond to 
the material is not as strong as the materials intrinsic strength.

I have had a bit more luck reinforcing cracks from the inside with carbon fibre 
and 
epoxy.  I roughen the surface of the plastic as much as possible using a Dremel 
or 
 rough sand paper.  In truth, epoxy doesn't seem to stick very well to most 
plastics 
so one has to create as rough a surface texture as possible so the epoxy keys 
to the 
plastic surface physically rather than just rely on its sticking power.

Once the surface is roughened I apply epoxy to the surface and then apply 
carbon 
fibres across the crack at right angles to it.  I would say cut a small piece 
of CF 
cloth and apply that but small pieces of CF tend to fall apart into their 
constituent fibres so you position each fibre manually.  You then apply more 
resin.

I have repaired a high stress fracture in a T32 where the powerful battery 
contact 
springs cracked the case apart.

Giles

Gary Edwards wrote:

> Let me get this straight.  My Bounce Grip can't be glued back together and you
> weekends at the RC model field, he crashes a lot.  As a result, he knows more 
> about
> gluing things back to gether than anyone I know.  So we WILL try gluing it 
> back
> together.  I'll let you know how it goes.
 

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