<!doctype html public "-//W3C//DTD W3 HTML//EN"> <html><head><style type="text/css"></style><title>Re: Tuning pin drilling? followup</title></head><body> <div>At 18:54 -0400 1/10/07, Erwinspiano@aol.com wrote:</div> <div><br></div> <blockquote type="cite" cite>   Yeah, it's a  synch.  I use brad points that just fits in the holes. I dimple each pin location & then drill with a brad point on the drill press. Hles vary & so do the brad point sizes. The brad point just homes in on that little target & bulls eye.</blockquote> <div><br></div> <div><br></div> <div>At 00:32 -0400 2/10/07, Erwinspiano@aol.com wrote:</div> <div><br></div> <blockquote type="cite" cite>    The bit I use is cheap as you can get.  It only has to be round and have a pointed tip so it puts just the slightest dimple in the Block.</blockquote> <div><br></div> <div>At 22:37 +0100 25/5/07, I wrote:</div> <div><br></div> <blockquote type="cite" cite>I first make the marks with a sharp punch, then use a centre drill and finally drill (right through or not, depending on the piano) with a special (German) wrestplank drill which has a more acute point than the jobber's drill and a faster spiral.  If drilling a pilot hole right through would make the result more precise, I'd do it, but I don't see that it would.  However I would never consider using the wrestplank drill without first using the centre drill.</blockquote> <div><br></div> <div><br></div> <div align="center"><img src="cid:p0624080ec3279acbba6f@[10.0.0.6].1.0" >      <img src="cid:p0624080ec3279acbba6f@[10.0.0.6].1.1"></div> <div align="center"><br></div> <div>I would never use a brad-pointed drill and I would never use any drill, no matter how dear or cheap, that did not have the fast helix angle.</div> <div><br></div> <div>JD</div> <div><br></div> <x-sigsep><pre>-- </pre></x-sigsep> <div >____________________________________________________________________<span ></span>__<br>   Delacour Pianos  *  Silo  *  Deverel Farm  *  Milborne St. Andrew<br>            <span ></span>          Dorset DT11 0HX  *  England<br>            <span ></span>            Phone:  +44 1202 731031<br>          Mobile: +44 7801 310 689   *   Fax: +44 870 705 3241 ______________________________________________________________________</div > </body> </html>