marking tuning pin holes for drilling.

[Erwinspiano@aol.com]

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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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