rescaling tension

[Carl W. Meyer]

Andrew;  I restrung a 6'2" Hazelton some time ago that had a cracked plate
in two places.  It cracked because of the stress put on the plate that was
bolted into the structure and the pin block in a position that caused the
two struts to crack in an obvious weak spot in the design.  I splinted the
crack and reinforced the strut by extending the splint past the weak spots.
I used PSCALE to check the scale and converted 6 notes above the bass break
from trichord plain to bichord wound.  I still have the before and after
scales that I could print out for you if you like.  I'd have to mail them
to you, cause I'm not sure I could get them out on e-mail.  Call me at
1-408/984-0482 if you like and I can tell you more about the stress the
plate was in.  Best to call 8-9 am pacific daylight time.


> [Original Message]
> From: <ANRPiano@AOL.COM>
> To: <pianotech@ptg.org>
> Date: 6/28/00 8:36:42 PM
> Subject: rescaling tension
>
> I am attempting to rescale a Hazelton 5' grand I had asked you all about 
> awhile back.  I am finding I am adding about 1500 pounds of tension by 
> getting rid of the very high enharmicity in the bass.  The plate is of
pretty 
> heavy construction but still 1500 pounds strikes me as a bit much to add.

> Although I thought I once read somewhere that plates are designed to 
> withstand 1/3 additional tension than they normally carry.  Would moving
the 
> bridge back be a better solution.  There is room and the back scale is
fairly 
> long considering the size of the piano.  I know it is convention time and
I 
> am not in a hurry yet, we have to refinish it first, but any help would
be 
> appreciated.
> 
> Andrew Remillard



--- Carl W. Meyer
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