[pianotech] Broken Drill Bit in Bridge

[Dale Erwin]

But of course...your friend!


Dale Erwin R.P.T.
Erwin's Piano Restoration Inc.
 Mason & Hamlin/Steinway/U.S. pianos
www.Erwinspiano.com
Phone: 209-577-8397

 
  





-----Original Message-----
From: Terry Farrell <mfarrel2 at tampabay.rr.com>
To: pianotech <pianotech at ptg.org>
Sent: Sun, Aug 12, 2012 11:02 am
Subject: Re: [pianotech] Broken Drill Bit in Bridge


Ahem....... you mean my "friend" - right!?


Terry Farrell


On Aug 12, 2012, at 10:49 AM, Dale Erwin wrote:


 Hi Nick
   As the founding member and yes, still president of "piano rebuilders anonymous" recovery group, for those who make mistakes but...don't like to admit it. Yeah, you... I'd like to welcome you and Terry as new members.
Dues are cheap and confession is good for the soul
 
  Good repair Nick, but 1/2 inch plug?  For what its worth a 3/8th mortising bit cuts a wonderful maple plug making the repair just a bit more.....delicate. But hey...whatever works


still president of "piano rebuilders anonymous"weDale
 
   Dale


Dale Erwin R.P.T.
Erwin's Piano Restoration Inc.
 Mason & Hamlin/Steinway/U.S. pianos
www.Erwinspiano.com
Phone: 209-577-8397

 
  





-----Original Message-----
From: Nicholas Gravagne <ngravagne at gmail.com>
To: pianotech <pianotech at ptg.org>
Sent: Sat, Aug 11, 2012 5:55 pm
Subject: Re: [pianotech] Broken Drill Bit in Bridge


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

 




 
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