Terry, Your friend may be interested in this little tidbit :) I posted this little idea on this list a while back. First, make small pattern of the bridge holes for later use. Next use a hollow screw extractor like Issac suggests. Remember, the pin is at an angle. There is no way to really do a nice neat job at this phase of the repair. Once the root canal is done, fill the hole with a dowel, glue in and trim flush with the top of the bridge. The purpose of the dowel is solely to provide some material for a 1/2" forstner bit brad point to center on. Next, use your 1/2" plug cutter to make a maple plug (1/2" should work). Note the direction of the maple material as to planing with and not against the grain, and mark your plug accordingly. With the forstner, drill down to a depth a bit less than the height of your plug. Glue in your plug; it should stick up a bit and will extend partly into the notch area. Trim down with a sharp chisel, sand smooth and DAG the area. Next re-drill your bridge hole (or two holes) and chisel-cut the notch in your usual way. See photos. Nick On Sat, Aug 11, 2012 at 4:09 PM, Terry Farrell <mfarrel2 at tampabay.rr.com>wrote: > Ummmm, a "friend" asked me to pose the question: How best to extract a > broken drill bit from a bridge pin hole? The top (broken end) of the bit is > about 1/8" below the top of the bridge. Any suggestions short of gouging > out a hunk of bridge? > > If I get a good suggestion, I'll pass it on to my "friend". ;-( > > Thanks! > > Terry Farrell -- Nick Gravagne, RPT AST Mechanical Engineering -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://www.moypiano.com/ptg/pianotech.php/attachments/20120811/c6f719c6/attachment-0001.htm> -------------- next part -------------- A non-text attachment was scrubbed... Name: Bad BR hole.jpg Type: image/jpeg Size: 30917 bytes Desc: not available URL: <https://www.moypiano.com/ptg/pianotech.php/attachments/20120811/c6f719c6/attachment-0005.jpg> -------------- next part -------------- A non-text attachment was scrubbed... Name: Forstner.jpg Type: image/jpeg Size: 41954 bytes Desc: not available URL: <https://www.moypiano.com/ptg/pianotech.php/attachments/20120811/c6f719c6/attachment-0006.jpg> -------------- next part -------------- A non-text attachment was scrubbed... Name: Plugged BR Holes.jpg Type: image/jpeg Size: 30421 bytes Desc: not available URL: <https://www.moypiano.com/ptg/pianotech.php/attachments/20120811/c6f719c6/attachment-0007.jpg> -------------- next part -------------- A non-text attachment was scrubbed... Name: Maple Plugs.jpg Type: image/jpeg Size: 31909 bytes Desc: not available URL: <https://www.moypiano.com/ptg/pianotech.php/attachments/20120811/c6f719c6/attachment-0008.jpg> -------------- next part -------------- A non-text attachment was scrubbed... Name: Plug Trimming.jpg Type: image/jpeg Size: 34142 bytes Desc: not available URL: <https://www.moypiano.com/ptg/pianotech.php/attachments/20120811/c6f719c6/attachment-0009.jpg>
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