key trimming bit

[Dean May]

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

 

  _____  

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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