marking tuning pin holes for drilling.

[Erwinspiano@aol.com]

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BTW
       A correction. It's a  letter U bit not V for reaming the plate.
       Sorry
       Dale:

  List
  Last year we talked about different methods of  marking Tuning pin holes 
accurately prior to drilling  the new pinblock block or I should say drilling it 
out of the piano. I have  come up with a way I like better than marking the 
circle with a pencil that's  faster & IMHO more accurate.
  I always ream out the holes in the plate prior  to refinishing the plate to 
clean out the old paint & accumulated  goop,rust, or excess paint from 
several spray can jobs. Also I see no reason  why the holes on & Steinway can't be a 
bit larger & also a larger  hole thereby removes some of the risk of having 
pins lean against the  plate flange. It bugs me and makes tuning a bit 
squirrley.
  The standard plate hole is . 5/16." I use a letter V  bit which is just 
slightly larger than that but smaller than a 3/8" bit to  ream the hole. My new 
trick is to take a 3/8" forstner and lightly grind down  the sides until it 
just fits in the newly sized plate hole. The spur on the  bit's bottom puts a 
nicely centered drill mark in the wood. You can't miss.  The edge of the forsnter 
marks the diameter of the hole which gives a nice  reference & says you 
really are hitting the hole dead center. Run the  forstner in a drill motor & Zip, 
Zip & 5 minutes later the hole are  marked. It takes about the same to resize 
the plate holes.
 When the block is set up on the press The dimpled mark  makes a beautiful 
pilot hole for your spur bit & the edge of the forstner  that has made a slight 
mark outlining the entire diameter of the hole for  reference gives one 
absolute confidence the hole is centered. You can't  miss.
    Hey Even trained apes can't screw  this up.
   Use it enjoy it.
     Dale Erwin  

Erwins  Pianos Restorations 
4721 Parker Rd.
Modesto, Ca  95357
209-577-8397
Rebuilt Steinway , Mason &Hamlin  Sales
www.Erwinspiano.com




 

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