This is a multi-part message in MIME format. ---------------------- multipart/related attachment ------=_NextPart_001_0011_01C33689.BA6C8740 I drill in the piano. I use a Self-Centering Transfer Punch (page 2110) = http://www.mcmaster.com/ to mark the hole center, and then I drill with = my overhead drill press. I get close by aiming the bit and the dent from = the punch draws the bit perfectly to the center. Below is the result - = unfortunately the viewing angle makes things look a little offset. Top = center is close to directly under the camera lens. They ended up = centered pretty well. A few are less than perfect, but not bad. On some = of these plates that have very small plate holes (some are not much = bigger than the pin), I can see that I would need to improve my = technique (but maybe we just need to drill the plate holes bigger?). I = error slightly away from the string side of the pin (toward the piano = top on this upright) figuring that if the pin ever moves at all, it will = move slightly toward the string side of the pin. Richards idea of a collar that sets into the plate hole sounds like a = winner - I might have to try something like that. Also, someone posted about drill bit runout. I've had a couple = machine-savy types tell me that whatever small-shop-type drill press you = get will have a chuck on it that costs about $3 (and might be worth even = less!). Buy your drill press, and then plan on spending about $100 or so = on a good after-market chuck. I think I paid about $85 for my chuck that = I slapped on my $59 Crapsman drill press - but it does seem to work = well! Terry Farrell =20 ----- Original Message -----=20 From: "Phillip Ford" <fordpiano@earthlink.net> To: <pianotech@ptg.org> Sent: Thursday, June 19, 2003 4:58 PM Subject: Re: Centering tuning pin holes >=20 > >Richard (and others), > > > > > >....Drilling the block in the piano is no guarantee of precise = centering. > > > >Best regards to all, > > > >Stan Kroeker, RPT >=20 > I agree with this Stan. I personally would like to hear from those = that drill in the piano about how they go about centering the drill in = the plate hole. I drill out of the piano at the drill press. I = temporarily attach the pinblock to the plate (or vice versa in the case = of a Steinway) and mark the hole locations with a transfer punch. I've = been happy with the results. >=20 > Phil F >=20 >=20 >=20 > Phillip Ford > Piano Service & Restoration > 1777 Yosemite Ave - 130 > San Francisco, CA 94124 > _______________________________________________ > pianotech list info: https://www.moypiano.com/resources/#archives ------=_NextPart_001_0011_01C33689.BA6C8740 An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/be/65/f4/2f/attachment.htm ------=_NextPart_001_0011_01C33689.BA6C8740-- ---------------------- multipart/related attachment A non-text attachment was scrubbed... Name: not available Type: image/jpeg Size: 33925 bytes Desc: not available Url : https://www.moypiano.com/ptg/pianotech.php/attachments/18/e3/46/dd/attachment.jpe ---------------------- multipart/related attachment--
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