Excellent JD, as usual! A real keeper. Thanks for taking the time to do it up so well. On Thu, Apr 22, 2010 at 11:11 AM, John Delacour <JD at pianomaker.co.uk> wrote: > At 18:12 -0400 21/4/10, William Truitt wrote: > > You called me superfluous?! Why, them's fightin' words!! :-) >> >> I will respectfully disagree that taking this small extra measure is >> superfluous. I have done it without such guide punchings, only to find >> that >> there was pilot error (no, I'm not talkin' about me!) and I did not get a >> straight line at the front. Small errors, but errors none the less. The >> idea of using the punchings and glue is not mine, but I can't remember who >> to give proper credit to. >> >> I hope your method will give you the results you seek. >> > > > Well, I'm glad to say it did and there's not a fag-paper's difference in > the key fronts (phwew!). > > You can see the process illustrated, without comment, here: > > <http://pianomaker.co.uk/technical/pully_keys/> > > I forgot to take pictures of the final making of the hole. Once the excess > hornbeam stub is chiselled off the pilot hole appears. I did the first few > on the bench drill but deicided it was not the best way. The pin is 3.7mm > and I used a 3.58mm twist drill in a small cordless drill, with the key held > upside down in the vice. I ran the drill slowly and at first backwards to > centre it well in the pilot bore. Then forwards to finish the drilling > through. Finally the awl to smooth and burnish the hole so that it fits > perfectly round the pin. > > I am really pleased with the way the job has gone and thank everyone for > their help. I'm even more pleased since my principal in London thinks I > ought not to work for nothing, so I might even get paid for this unforeseen > work! > > JD > > > -- > ______________________________________________________________________ > Delacour Pianos * Silo * Deverel Farm * Milborne St. Andrew > Dorset DT11 0HX * England > Phone: +44 1202 731 031 > Mobile: +44 7801 310 689 > ______________________________________________________________________ > -- Nick Gravagne, RPT AST Mechanical Engineering -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20100423/43b753c1/attachment.htm>
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