Hi, Alan, This is not an operation I do very often (5 or 6 times in 20 years, in most cases doing the "cleaning-up" after local tooners...). Damage to the block has never been a problem, so I am not plugging the drilled holes. I drill the guide-holes with a smaller bit than the size of the tuning pin hole (6,0 mm), so those pins can usually be put back in place. For the hole that I drill from the back, I first make an attempt with a 7 mm bit, and if I don`t end up in the center of the broken pin, I will have to use a larger size. Damage to the block in this hole is not a problem either, since I have not drilled into the layers where the tuning pin is sitting. The new pin will be the same size as the broken one, or eventually one size larger. For cosmetic reasons, I plug the holes on the back side of the piano. Kjell Sverre Fardal / NPTF Kristiansand / Norway ksfardal@online.no -----Opprinnelig melding----- Fra: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]På vegne av tune4u@earthlink.net Sendt: 17. februar 2003 02:11 Til: Pianotech Emne: RE: Broken Tuning Pin Removal Do you do anything to plug the drilled holes or do any repairs, reaming, or use of oversize pins, etc., to compensate for possible damage to the block? ... or is this just not a problem? Is your bore hole made with the same size bit or larger, since an exact alignment seems unlikely? Alan Barnard Wishing my Norwegian was as good as your English in Salem, MO -----Original Message----- From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]On Behalf Of Kjell Sverre Fardal Sent: Sunday, February 16, 2003 6:36 PM To: Pianotech Subject: SV: Broken Tuning Pin Removal Hi, Philip; This is how I do it, if nothing else works: Remove 2 or 3 of the pins closest to the broken pin, and drill holes right through the block (6 or 6,5 mm on normal tuning pin sizes). From the back-side of the piano (upright), mark the spot where the broken pin`s hole should end up. Then bore from the back-side until you reach the end of the broken pin (I use hammer shanks as guides in the other holes to get the right bore-angle). Now you will be able to drive the broken pin through the block (from the front-side)... I`ve done it several times, not that difficult! Kjell Sverre Fardal / NPTF Kristiansand / Norway ksfardal@online.no -----Opprinnelig melding----- Fra: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]På vegne av Philip Jamison Sendt: 16. februar 2003 21:54 Til: pianotech@ptg.org Emne: Broken Tuning Pin Removal Any ideas for removing a broken pin that's too small for the standard extractor? It's about .250". Hole doesn't go throught the block, so I can't punch it out. Pin too thin to use a screw extractor. "Drive-on"- type extractors would just drive in the pin. Philip Jamison Pianos West Chester, PA _______________________________________________ pianotech list info: https://www.moypiano.com/resources/#archives _______________________________________________ pianotech list info: https://www.moypiano.com/resources/#archives _______________________________________________ pianotech list info: https://www.moypiano.com/resources/#archives
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