On Jun 23, 2010, at 1:32 PM, Jeff Farris wrote: > Hi List, > > Anyone know what size drill bit to use for drilling new damper wire > guide rail holes for a Steinway B? Or where to find out? > You can find out by experiment. Start with the diameter of the damper wire, add two times the thickness of the cloth (cloth on either side of the wire), add a bit more for clearance and for the fact the felt is going to bunch. Drill a hole with a bit that diameter, insert felt, see where you are. Start conservative, so you can just go up a size or two, and you can do your experimenting on the rail itself. Whatever standard anyone uses is married to the felt thickness. You can vary diameter and vary felt thickness within a range. Another way to "find out" is to match drill bits to an existing rail and its holes. You can get a good idea just placing the bit against the hole. Or be precise by pushing out the felt and later replacing it. Regards, Fred Sturm University of New Mexico fssturm at unm.edu -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/caut.php/attachments/20100623/5b6a4a1d/attachment.htm>
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