my own Soundboard

[Ron Overs]

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Greg Newell wrote:

>  > Greetings enlighteners,
>  >     I have posted recently about installing my first board . . .
>  >     . . . I've read recently about current suppliers making 
>tongue and groove
>>  panels and I think I could possibly do a somewhat respectable job making
>>  a flat panel this way.

This is an excellent method, not for its strength, but because it 
allows for the boards to be glued together without sliding out of 
alignment when the clamping pressure is applied. The boards can 
therefore be made thinner .

>  . . . I will also need a way to clamp the
>  > board to the inner rim. i've asked Ron Overs to e-mail me  a picture of
>  > his set up as he posted once before that he had clamps made for him.

Sorry for the delay in getting back to you Greg. I've had a couple of 
pressing matters here in Sydney which required my attention. A jpeg 
side elevation drawing of the clamps is still available on our 
website at;

http://overspianos.com.au/clamp.jpeg

We built every one of them (35 - sufficient to do a 9'6" piano board) 
in our own workshop (including turning up the ball ends and 
swivel-feet). It took Wal and I a full week to make the 35 clamps. It 
could be done quicker if you are prepared to build them sloppily. But 
since I am going to have to walk past them in the workshop for the 
next twenty years, I wanted them to be tidy. You can buy the threaded 
rod in. A nut is welded to the top of the threaded rod to form the 
'bolt-head'. I made the spine of the clamp out of 25mm x 50mm RHS (it 
doesn't need to be strong, since these clamps will never be used to 
apply extreme pressure), with the top and bottom of the C made from 
25mm x 10mm solid section. The jpeg on our web site is not at 1:1 
scale, but the outer rim shown in the jpeg is 26 mm thick and the 
clamp spine is 50mm across. It should be possible to set your printer 
to a percentage oversize to allow for print out at 100%. Stick the 
resulting pages together to give you a working drawing.

The finished clamps can be seen on our piano no. 003 just after 
clamping the board in for the last time, at;

http://overspianos.com.au/3glrs.html

Do you like the title? In 'musical circles' we always hear about the 
three tenors, so in 'sound board circles' we have?

I designed the clamps so that they can be fitted to any rim from a G2 
Yamaha to the largest concert grand rim. The adjustment bolts on the 
spine of the clamps can be adjusted to fit them to each outer rim as 
required. The clamps can be fitted to the rim before the sound board 
is placed into the case. The clamping feet are wound right up to 
allow for the sound board to be positioned easily. When fastening the 
board, they can be wound down to the board very quickly with two or 
three operators on electric screw drivers.

>  > I'm not easily frightened away from things like this so don't bother
>  > with the buy one first and then make your own after you gain some
>>  experience. I have nothing to loose except my time and materials. Unless
>>  there is some equipment I just don't have or can't easily borrow, rent
>>  or otherwise obtain the use of, this sounds like fun. I look forward to
>>  your posts.


Good on you Greg. You'll find out a lot more about pianos by actually 
doing it, as opposed to the less successful approach - gesticulating 
for hours on a computer keyboard.

All the best.

Ron O
-- 
                  OVERS PIANOS
        Grand Piano Manufacturers
_____________________________

Web:    http://www.overspianos.com.au
Email:  mailto:ron@overspianos.com.au
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