[pianotech] Reamer question

[Dean May]

Personally, if I were not replacing the pin block I would not ream. I would
use thin CA glue. I've done a couple uprights like this with great success.
I just went up one size of pin and squirted a few drops of CA into the hole
before driving in the pin. They held fabulously and weren't too tight. 

 

But if the piano is of any consequence, replace the block. It isn't that
hard, be good experience for you, and you can ask the list questions as you
go if you have any.

 

Dean

Dean W May                (812) 235-5272

PianoRebuilders.com    (888) DEAN-MAY

Terre Haute IN 47802

  _____  

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Ed Foote
Sent: Thursday, June 03, 2010 10:37 PM
To: pianotech at ptg.org
Subject: Re: [pianotech] Reamer question

 

 >>That is, do I have a good chance of reaming past the dope to good wood?
If so, what size reamer and pins are recommended in this case?

Greetings,
    First thing to accept is that this is a compromised approach. If you
want to guarantee your work, and are willing to eat this job next year to
protect your reputation, have at it!    It may work well, as I have reamed
with bits and had good results. I would use a drill bit of the appropriate
size for 3/0 pins ( which may not take enough wood out of the hole to remove
the doping).    
     The first thing to do is dull the cutting edges on the tip of the bit;
there is no reason to be cutting before centering.  Then, with a grinding
stone, very lightly taper the bit for the first inch or so, so that when you
enter the hole, (using a hand-held 1/4" drill), that first inch doesn't do
anything but make sure you are on axis with the existing hole.  Then, on the
plunge, the untouched edges of the flutes, farther up the bit, will cleanly
cut the hole to size without glazing or scorching. 
   The reason for the 1/4" drill, held by hand, is that with a soft touch,
it will find its own center in the hole and avoid the wallowing out at the
top.  
Regards, 
Ed Foote RPT  

 

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