Yamaha hinges

[Gevaert Pierre]

----- Original Message -----
From: "Newton Hunt" <nhunt@optonline.net>
To: "Pianotech" <pianotech@ptg.org>
Sent: Wednesday, October 02, 2002 10:54 PM
Subject: Re: Yamaha hinges


> If the problem only involves screws pulled out of the wood then yes, it
> can be fixed in a short time but I would recommend allowing 24 hours.
>
> If there is a lot of wood missing then you will need to replace the wood

Yes, there is indeed to much wood missing. What wood and glue should be the
best choice for such repairs?


> but I would suggest getting or making 10 mm or so wooden plugs.  Plugs
> are different than dowels in that the grain in a dowel runs parallel
> with the screw, the weakest direction for a screw.  Plugs on the other
> hand have the grain at 90 degrees to the screw so they hold far better.
> Going through the growth rings provides the best holding power for the
> screws.  In this case you will need to drill new holes but if you sue
> hardwood plugs they will hold far better but if ripped out again they
> can cause real damage to the rim.  So, use a medium hard wood instead.
>
> If you use only glue use medium or thick CA or epoxy.  You will need to
> spray the screws with a teflon mold release dry lubricant type so the
> glue does not stick to the screw.  Put the glue in the hole and run the
> screw in slightly further than the hinge will hold it away from the rim
> and allow to set for 24 hours.  The CA will need that long to set
> because it is deep inside the wood.  CA has the advantage that it
> penetrates the wood and becomes part of the wood which provides
> excellent holding power.
>
> THe next day come and loosen the screws but do so with a very fast
> impact motion.  This will break the bond between the glue and the screw
> and you will have a nicely formed screw hole that takes the screw well.
>
> Put the lid back on and you are ready to go.
>
> If it helps to align the screws you can put the hinge in place but take
> care that you do not get glue on it and glue a screw head to the hinge.
> :)
>
> I have done lots of these types of repairs at the university where
> stripped screws are common, all too common.
>
> Newton
>
>
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