Thank you, Ed. Very nice. ----- Original Message ----- From: <A440A at aol.com> To: <pianotech at ptg.org> Sent: Sunday, August 03, 2008 6:34 PM Subject: Re: Doweled and Fully Fit Pinblocks > > << I would love to read procedures for nailing this left, right, tight at > both ends fit. It is, after all one that can be seen by every one. >> > > I can usually get a block in with no more than .020" sideplay, and that > is > because of bad eyes, I suppose. There are times when there is no > sideplay, > but fitting is more difficult,(though as Jon says, rounding off the > opposing > edges will allow it to slip in and out without damaging the finish. > I drill two .050" holes in each end of the old block, through the plate, > before I take it out. Once the plate is removed, and before I cut the > block > out, I push a # 20 centerpin into each hole and take a using a dial > micrometer, > I measure the distance from the pins to the sides and the proximal pin to > the > stretcher. This can be done to the thousandth of an inch. Record these > numbers. Once the new, oversize block is fitted to the plate, use the > holes in > the plate to drill new index holes in the new block. Get the micrometer > back > out, and measuring from the holes, place a chisel mark where the sides and > stretcher used to be. I can then cut the block with the kerf just > touching the > chisel marks. I then put the block in the piano, screw the plate to it, > and make > sure the plate is back where it was originally. Done carefully, it will > be > within a couple of thousandths. I then glue the block to the case sides > and > stretcher while it is still attached to the plate, (which is held in its > original position). To duplicate the original position, sometimes I have > to prop up > the tail of the plate to match the position it had with the strings off, > rim > bolts out, yet still screwed to the block. Some of these plates are flexed > over the nose bolts, and this is the way of maintaining that, if desired. > After the glue cures, I lift the plate out and install dowels into the > case and stretcher. I can then bolt the plate back in, knowing that it > was just > like originally. After that, I can move the nose bolts for bearing > purposes, > knowing where I am so that I don't overflex the thing. > I do like Jon's idea of a pattern for the end angles, might try that on > this one. > Hope that helps. > Regards, > > > > > Ed Foote RPT > http://www.uk-piano.org/edfoote/index.html > www.uk-piano.org/edfoote/well_tempered_piano.html > <BR><BR><BR>**************<BR>Looking for a car that's sporty, fun and > fits > in your budget? Read reviews on AOL Autos.<BR> > (http://autos.aol.com/cars-BMW-128-2008/expert-review?ncid=aolaut00050000000017 > )</HTML> > >
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