Wouldn't a marking device with three prongs be superior to an awl? They would be in perfect alignment with each other. Please comment. I don't replace bridges but am interested. David Ilvedson, RPT Date sent: Sun, 13 Jun 1999 18:50:25 -0500 From: Carl Root <rootfamily@erols.com> To: pianotech@ptg.org Subject: Re: Fine points of drilling bridges Send reply to: pianotech@ptg.org > > For those of you who make bridges, I'd like to hear what kind of drill > > bits you're using to drill the bridge pin holes, and the technique you > > use. > > > > Here's what I've been doing. I've been laying out the pattern on the > > fresh cap, marking it fist with a pencil mark, and then with a very > > sharp awl (not deep, just a mark I can see, perhaps 1/32" deep), > > I would make a deeper mark without using the pencil as an intermediate > step. The awl is OK but you don't want the mark to produce a hole with > a larger diameter than the bridge pin, so I suggest a nail with a > diamter only slight less than the bit. You could then go at least > 1/16". If the dimples don't line up exactly, you can exaggerate the > angle of the bit at the start, than correct the angle. > > Carl Root, RPT > Rockville, MD > David Ilvedson, RPT Pacifica, CA ilvey@jps.net
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