[sdiy] Gluing Broken Keys Back Together?

mike ruberto somnium7 at gmail.com
Thu Sep 23 21:57:29 CEST 2010

Ok so with a proper epoxy or superglue, a clamp, little braces and the
help of gravity I should be able to get the key together without a
mess. I suppose I will go over to the local Lowes and buy a few
different advesives and then carefully test them on the part of the
key you normally won't see to make sure it won't discolor or otherwise
disfigure the material.

I will give Liquid Nails a try since I remember once using it
successfully to repair a broken glass window. Not only did the glass
hold together but it didn't leak either!

The pins would have been a nice idea if I had some accurate way to
make the holes line up perfectly. That isn't going to happen with a
hand drill though.

What if I used a piece of double-sided tape as a fixture? I could
place adhesive on the two ends of the key, then fit them together and
stick them to the tape. While held in place on the tape I could place
the support bracing on the underside with the epoxy. The tape would
act as both a clamp and like painters tape to prevent excess glue from
flowing onto the top surface of the key. Hmmmm....

On Thu, Sep 23, 2010 at 2:53 PM, Paul Cunningham <paul at cometway.com> wrote:
> I've honestly had great success just glueing with Liquid Nails or superglue. As long as the pieces pit perfectly together the bond will be quite strong and you shouldn't need to worry about extra reinforcement. I have even repaired some keys that not only broke off but shattered into multiple little pieces. You can barely tell the hairline cracks are there. Just make sure to let the glue completely cure before you play it. -pc
> On Sep 23, 2010, at 1:47 PM, "Adam Schabtach" <lists at studionebula.com> wrote:
>> Trying to drill holes and insert reinforcing rods will likely make the
>> alignment between the broken parts worse than if you just glue them as-is.
>> Cyanoacrylate glues (e.g. Super Glue) require the two parts to fit as
>> precisely as possible, so you're likely to make the joint weaker if you do
>> anything that messes with its alignment.
>> I would do what someone else has suggested: super-glue the pieces at the
>> break, then laminate pieces of plastic or metal onto the back of the break
>> with epoxy. There is a special formula of epoxy for plastics that might be
>> helpful, but just the regular stuff will probably be fine.
>> --Adam
>>> -----Original Message-----
>>> From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-
>>> bounces at dropmix.xs4all.nl] On Behalf Of Ben Lincoln
>>> Sent: Thursday, September 23, 2010 9:08 AM
>>> To: Synth DIY
>>> Subject: Re: [sdiy] Gluing Broken Keys Back Together?
>>> I was going to suggest something along these lines as well. If there is
>>> enough volume to the keys, use a very small drill bit (e.g. 1/32") drill
>>> holes into them, squeeze epoxy/superglue/etc into the holes, and embed
>>> something like a sewing needle between the two parts to bridge the
>>> actual break point. If there's not (or you're concerned about damaging
>>> them even further), then reinforcing with a rectangular piece of plastic
>>> in a non-visible part of the key works too.
>>> It probably goes without saying, but if you can clamp the pieces
>>> together while the glue is drying, so much the better.
>>> I'm sure it's been discussed extensively before, but it seems to me like
>>> this is one of the many areas that at-home CNC/3D-printing equipment
>>> will make a lot easier in the next 10-20 years. Why try to piece back
>>> together keys (or track down obscure replacements) when you can just
>>> manufacture your own?
>>> Colin f wrote:
>>>> If it's a good clean break and the two parts fit back together tightly,
>>> use
>>>> superglue.
>>>> Then re-inforce the join on the back using two part epoxy, embedded a
>>> piece
>>>> of other material if you can fit it in.
>>>> A good tip for using superglue - it is actually a two-part glue, the
>>>> hardener being water.
>>>> Put superglue on one face of the join, then breathe on the other to make
>>> it
>>>> a little moist before pressing and holding together.
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