Pinblock Glassing

[Overs Pianos]

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Hi Joe,

I'll second Terry's post. We use a locally made thick viscosity epoxy 
filler, but the West System stuff is very good also. The 225 piano 
we're building has two plate flanges, one either side of the pin 
block. We epoxy fit the block to both flanges. Floor wax makes a very 
good release agent and there's no risk of contaminating the pin 
block. Only a thin coating of wax is necessary. It doesn't take long 
and the fit will be perfect. Its also a good idea to grind the plate 
flanges if they have a very rough finish, or there may be a tendency 
for the plank to key into the flanges. You don't need to be too 
particular about the smoothness of the flange surface, but you don't 
want it too rough either. We epoxy fit the plank to the plate outside 
of the case, then fit the plank and plate to the case using our 
action-strike-line jig for determining the location of the plate. 
While the epoxy is setting, the plank is screwed to the plate in the 
same manner as it will be fitted in the case. While there's nothing 
wrong with doing a perfect plank fit the woodworking way (we used to 
do this), I don't see the point in wasting time on the process when 
the plank can be quickly fitted up to around 0.5 mm tolerance, then 
epoxied to make a perfect fit.

I suspect that a well-fitted plate helps tuning stability.

Ron O.


>Joe, we just went through this a day or two ago.
>
>Use car wax or any number of other release agents to epoxy does not 
>stick to plate. 
>
>I use West System epoxy and #404 High Density Filler (peanut butter 
>consistency). This is their highest strength filler. If you don't 
>goober too much on, you won't need to sand it, so using it is 
>hassle-free. Only used enough to fill any gaps. If you don't goober 
>too much on, it won't spread under the plate web.
>
>I highly recommend using the West System Two-Step Bonding Method to 
>ensure the epoxy never comes loose.
>
>100% success rate.
>
>The plate should be set in it's final resting position when the 
>epoxy is curing - screwed to the pinblock and bolted to the rim - 
>shouldn't need clamps, but it is also fine to use clamps to 
>apply some pressure on the flange toward the pinblock.
>
>Also, check the archives - no doubt there is tons there also.
>
>Terry Farrell


-- 
OVERS PIANOS - SYDNEY
    Grand Piano Manufacturers
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Web http://overspianos.com.au
mailto:ron@overspianos.com.au
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