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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