key trimming bit

[Fenton Murray]

Hey Mike,
That's a great tip regarding temperature of the plastic.
Fenton
  ----- Original Message ----- 
  From: Dean May 
  To: 'Pianotech List' 
  Sent: Friday, March 14, 2008 11:22 AM
  Subject: RE: key trimming bit


  Thanks for the tips. The shop is around 60 F. Maybe we can try warming the keys more. 

   

  Do you use a double spiral or triple?

   

  Dean

  Dean May             cell 812.239.3359 

  PianoRebuilders.com   812.235.5272 

  Terre Haute IN  47802

   


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  From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Michael Kurta
  Sent: Friday, March 14, 2008 1:32 PM
  To: Pianotech List
  Subject: Re: key trimming bit

   

      Hi Dean:

      After lots of trouble with chipping during the trimming process and 150 sets of keys, here's the recipe: 1. Use an upspiral carbide bit.  2.  Make sure there is no play in the bearings of your router.  3.  Hold the key firmly when cutting.  4.  And this is a BIG one, the plastic should be at room temperature when trimming.  This eluded us for years until by accident we found that we were trimming in a cold space.  When we warmed the keys, the chipping disappeared.  Good Luck.

      Mike Kurta 
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