Pinblock/back separation repair

[tom]

OOOPS-I forget to mention glue! This one was clean . Nice raw wood surfaces
with no glue residue , so on principle  I vacuumed out the opening and used
titebond  spread with a soundboard steel just before the gap was closed.

            T.D.

 

  _____  

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of tom
Sent: Friday, March 02, 2007 11:31 AM
To: 'Pianotech List'
Subject: RE: Pinblock/back separation repair

 

List,

            My last back repair was on a generic spinet -early 50's as I
recall.

            I've often lowered pitch before pulling things together with
heavy C clamps, but this piano was 100 cents + low .

            I set up my accutuner and checked pitch across the scale as I
-SLOWLY!!! --tightened and closed the back.

            Easiest pitch raise ever! The thing came up right around pitch
as the back closed up. . 

            This piano had plate screws in the right places to secure the
repair. I removed them and drilled through for bolts.

I like to use carriage bolts with the head on the back side with washers on
both sides and lock washer and nut on the front.

            I usually bring a few lengths of bolt and if nec. cut any
protruding threads with a hack saw. File smooth and you have a neat repair
without any protruding nuts on the back to scratch the wall.

            Then tune, tune, tune .and to answer the question the job took a
few hours including a few passes to stabilize tuning.

            I set up follow-up tuning shortly after as we were on the cusp
of a season change here in N.E.

Tom Driscoll RPT

 

----- Original Message ----- 

I need to do this repair on a 46 year old Sohmer upright, model 34K.  I have
the procedural description found in Randy Potter's course but I'm looking
for a rough estimate of the person hours involved.  (Already consulted "G"
Piano Works Repair Labor Guide, to no avail.  But Joe, how do you like that
citation?)  Anyone have any ideas how long each bolt takes?  the entire job?
Any help/guidance would be greatly appreciated.

 

Jim Frazee

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