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Dale Erwin wrote:
Could you share how it is you're measuring 1.5 degrees of bearing on the =
bass and with what. If the rear string length was 8 inches( possible on =
a D) 8 Times .026=3D.208 or (1.5 degrees) of distance bearing . =
Considering this bass bridge has no cantilever I don't mind seeing this =
at the top end of the bridge but I'd like to see .05 degrres in the mono =
section........................
Dale, All measurements referred to so far were from the strung piano. =
Individual strings were removed and thread/gap measurements were taken. =
I was conservative in the bass and subtracted for the twisted part of =
the string riding on the hump. Note # 3 showed 1.3 deg, note # 10 =
showed 1.7 deg, and note # 19 showed 1.3 deg. Inverse tangent of =
(gap/rear length).
Did you mean to write .5 deg in stead of .05 ? Just for giggles I =
checked one of the previously measured tenor bridge strings in the =
middle of the overstrung section after the bass strings were off. (The =
following day) It came up from .06 deg to .5 deg.
Greg Newell wrote:
I re-read your original post below and I still come to the same =
conclusion. It sounds as though you're somewhat accomplished in =
rebuilding so I'm not sure I understand your hesitation in recapping. If =
the original pins are loose and you don't intend to replace with =
oversize but you are going through the trouble of pulling the plate and =
then subsequent re-stringing then .... why not? =
..............................
If I could do something with epoxy in a few hours and save all that =
expense. It will get new pins. I am not an accomplished rebuilder or =
expert woodworker. I have done dozens of restringings and several board =
shimming internal restorations with doweled in new blocks. I haven't =
done any in shop belly work for almost a year. Am doing mostly actions =
now. At one time I was hot to try bridge capping but I don't think this =
is the right time for me. The piano will go to another shop if that is =
the decision. It has been a lot of dues paid to get to where I am right =
now. It has kind of been a relief that the constant acquisition of =
tools has slowed and I have been busy doing things I am good at. I'm =
reluctant to take on the big learning curve again. It is tempting =
though. I am handy with chisels and planes and japanese saws and reach =
for them first before power tools. I used to cut down key # 88 with a =
bandsaw, now I pare it with a chisel just for the pleasure of it.
Ron Nossaman wrote:
But it's not being condemned, it's being restrung even though it sounded =
ok=20
before? Is the damaged cap the reason for the restringing? And if so, =
why=20
the reluctance to replace it? If not, why is it being restrung?
The piano is long overdue for restringing. It has never been restrung. =
It is starting to shed treble strings. Capo needs to be reshaped. No =
one noticed the cap. It does not sound good in the treble. I thought I =
was catching a whiff of that old " If it doesn't have X amount of crown =
it isn't worth working on". That was why I said I was not going to =
condemn the piano. I was trying to find out if any one had done the =
kind of bridge top resurfacing that I am imagining. I have an =
obligation to try to repair economically before replacement. =20
>I'm anticipating tight new bridge pins are going to contribute to tonal =
>improvement up higher.
Why, considering the condition of the cap and resulting bearing =
measurements?
The pins come out easily. I thought the bearing was ok in that part of =
the piano. (I'm not an expert, I'm soliciting an opinion from you =
rebuilder types)=20
Everybody,
One thing I have learned already is to inspect every piano in the =
field if possible. I hate these kind of surprises. Forgive my lack of =
protocol knowledge on this kind of message board if I'm creating strange =
posts. I guess we have to be careful not to take each other out of =
context with all this cutting and pasting.
I attempted to quantify the condition of the grooves now that the =
strings are off. Either it doesn't look as bad as I thought or I'm =
getting used to it. Maybe they are swelling up a bit. Humidity is up. =
I held a straight edge on the edge of the bridge and slid a needle under =
until it stopped. It measured between .025" and .030" in tenor and low =
capo. High capo was .020" to .025". Actually that is about as bad as I =
imagined, the strings were about 2/3 into the top. I have no idea what =
"normal" wear is because I have never thought about this before. =
Mitigating factor : the wood at the edge that the ruler was on is a =
little bit puffy.
Is this too far to sand/plane down? Could the duplexes be ground =
down a bit if so? This might be my last gasp here. Does anyone know =
of anyone who has attempted to resurface a top? I guess this is mostly =
for my own interest since I would only do it if it were a known =
procedure that worked. Like epoxying pins is now a known procedure. I =
seem to remember it used to be controversial.
I just had another thought that might not offend those who thought =
any buildup of epoxy in the groove would fail. What about swelling the =
top a little, then planing, then renotching, then pins in w/ epoxy =
and saturating notches and top. Any amount the grooves swelled up would =
then be saturated and not built up. (Wood Epoxy Saturation Technique =
anyone?)
Cheers, Steve Bellieu
----- Original Message -----=20
From: Erwinspiano@aol.com=20
To: pianotech@ptg.org=20
Sent: Wednesday, December 18, 2002 6:04 PM
Subject: Re: Bridgetop Extravaganza Revisited
In a message dated 12/18/2002 4:03:28 PM Pacific Standard Time, =
sbellieu@mindspring.com writes:
Subj: Re: Bridgetop Extravaganza Revisited=20
Date: 12/18/2002 4:03:28 PM Pacific Standard Time
From: sbellieu@mindspring.com
Reply-to: pianotech@ptg.org
To: pianotech@ptg.org
Sent from the Internet=20
Steve
Could you share how it is you're measuring 1.5 degrees of =
bearing on the bass and with what. If the rear string length was 8 =
inches( possible on a D) 8 Times .026=3D.208 or (1.5 degrees) of =
distance bearing . Considering this bass bridge has no cantilever I =
don't mind seeing this at the top end of the bridge but I'd like to see =
.05 degrres in the mono section. That being said I've seen D basses set =
up with more than that that sounded great and ones with nominal bearing =
or none that sounded somewhat weak. Where's the beef?
What's really there has or will come to light with the strings off =
no doubt.
Dale Erwin
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