Soundboard-to-Rim Clamp Pressure

[Jon Ralinovsky]

Hi Terry,
I'm no expert, but I'll put in comments below.

>You thought I was done. WRONG!
>
>I have come to the understanding that application of proper pressure 
>when gluing the rib to the panel is very important for a glue joint 
>of maximum strength and longevity. Makes sense to me. I should think 
>the soundboard-to-rim clamping pressure would be as critical. I 
>might be inclined to think that optimal pressure would be similar 
>for this joint as the rib to panel joint (40 to 50 psi).

I think the manufacturers (at least Baldwin) use 25 psi.  It seems to 
be sufficient.

>How in the world does one turn a screw on a clamp and feel 
>comfortable that he/she has applied enough, but not too much, 
>pressure? How about a little pressure gauge in each clamping block? 
>Or is there a better way?

What about firehose and air pressure?  At least that way you can 
measure what the pressure is.

Respectfully,
Jon



>Terry Farrell
>

Jon Ralinovsky
Piano Technician
Department of Music
Miami University
513/529-6548