I agree, at this moment I just have read a complete course on repining that was gently given to me by the Renner's people, and some points that I find important just appears. 1° Always put back a center pin in the same direction it was inserted at first - as pinning is generally done by a machine with short center pins, the insertion direction is where the pin is yet plated, or the opposite is where we can see the cutting marks. When reaming , always ream in the same direction, to keep the fiber in line. Always burnish, also the same direction - for that reason it is considered a better method to use the long center pin, when, inserted all along and passing thru the flange (with pliers a good straight one pass move is considered) , they burnish the bushing and we avoid the use of the burnished. A support is used to hold the flange, a lithe strong plank with a saw line at the top (and a little metal plate if wanted) Since then, I have done 3 pinning jobs, with a much better consistency, and avoiding the need to go thru 2 sizes when one was enough. I have taken back in service the set of long (2") center pins I had. For some reason I had stopped using them, as many techs here, using them gives a very good feel on what goes on in the flange, much more than with the little ones, so I'll keep that method for the moment. Having to pass thru with a long wire may look tedious, but in fact it is done easily, with a little force because of the Birdseye (when there is one) flat pliers and the wooden support make that job easier than I thought at first (and it was the original method I learned, as usual, back to the old good methods ;>) About Birdseye too free, this is not a defect I see often, very rarely in fact. I believe it arise when the pinning is done too late (or if the wood used is not fine grained enough) if the hammers are not traveling in a "straight" line also, that makes for a lot of problems sooner or later. Nowadays that seem to be the problem with Terrys flanges. Best to all, and think of your holidays now ! Isaac O Isaac OLEG Entretien et réparation de pianos. PianoTech 17 rue de Choisy 94400 VITRY sur SEINE FRANCE tel : 033 01 47 18 06 98 fax : 033 01 47 18 06 90 cell: 06 60 42 58 77 > -----Message d'origine----- > De : pianotech-bounces@ptg.org > [mailto:pianotech-bounces@ptg.org]De la > part de Scott Jackson > Envoyé : dimanche 20 juillet 2003 11:50 > À : Pianotech > Objet : Re: Flange Center Friction Increase > > > No matter how 'gently' i try, i have never been able to put > a cut centre pin back in a bushing without knocking out the > cloth! I would not recommend trying this to anyone (unless > they really want practise at re-bushing flanges!). > > Scott Jackson > Australia > > ----- Original Message ----- > From: "Paul Chick (Earthlink)" <tune4@earthlink.net> > To: "Pianotech" <pianotech@ptg.org> > Sent: Saturday, July 19, 2003 10:07 AM > Subject: RE: Flange Center Friction Increase > > > | Terry > | Isaac Sadisgursky talked about this in his class on > center pins at the > | Convention. He demonstrated how a center pin can be too > tight in the > | bushing cloth and loose through the wood, just the > opposite of what it > | should be. This problem can be spotted as you > describe--fewer swings as you > | go along. Here's his test: carefully remove the center > pin from an > | offending flange. Gently place it back in the bushed > flange and check the > | friction just by pushing the pin with your fingernail. > Now place the same > | pin in the wood and push it with your fingernail. > Chances are you can push > | it right through the wood. The problem is caused by > using the assembly wire > | used in the flange to size the bushing cloth during > manufacturing. When the > | flange is installed, the worker slides the wire back to > clear the other > | member then slides it through and cuts it to length, > fitting done. Isaac > | says to watch for centers that are clipped on both sides > of the flange. > | This will tell you a wire had been used. He then went on > to demonstrate how > | to repin a set of flanges in about 45 minutes. > | Paul C > _______________________________________________ > pianotech list info: https://www.moypiano.com/resources/#archives >
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