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Terry,
If you clamp a piece of 4" steel "U" beam, or C-channel across the rim
directly above the belly rail, you'll have several options. You can get
double-duty out of your pin-block supports at this point, or use a truck
tire inner tube and air pressure. Medium-sized hand screws can be used
sometimes, also. Depends on the length of the screws, but real good for
dealing with odd angles. You can shape the ends of the hand screws for
holding cauls or blocks. Also handy for certain bridge repairs, if you move
the channel around. I had one years ago with four short-throw pneumatic
pistons mounted equidistant that I used for various clamping jobs. That,
though, was a little tricky. Those pistons could push ..... well.....
realllllly hard, if I wasn't careful. One neat thing was the valve. I used
an "always-on" push-button air valve, that could be used for a hammering
action. Real handy for veneering.
Just a couple of old-but-effective techniques.
"ingenious/superior"? .... naw.....
have fun,
Guy
At 08:40 AM 10/11/2004 -0400, you wrote:
>To those in the habit of gluing soundboards to piano rims......
>
>In the high treble along the belly rail, the belly rail is commonly not
>vertical, but rather angled a bit towards the pinblock at the upper edge
>where the soundboard to rim joint is. This presents a bit of a clamping
>challenge. I have used go-bars in these kinds of areas in the past, but
>would greatly prefer to use a clamp. Also, when gluing the board to a
>cut-off bar in the area where the cut-off overlaps the horizontal portion
>of the belly rail (and this can be quite wide on well-built pianos)
>presents an area where a traditional clamp cannot be used. Again, one can
>use the go-bar, but I wonder if some of the wonderfully invent-ful
>participants of this list haven't come up with some kind of
>ingenious/superior method of clamping in these areas.
>
>Ideas?
>
>Terry Farrell
>
><http://www.farrellpiano.com>www.farrellpiano.com
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