key trimming bit

[Jean and David Weiss]

Dean,

 

I had the same problem which I finally solved by heating the keytops before
I notch them.  I came to believe that the keytops are too brittle.  

 

I put the keys under a lamp with my Dampp Chaser digital temperature and
humidity gauge laying on top of them.  When they are about 80 degrees I
start notching, and I move the key past the router bit VERY slowly. Using
this method I have had absolutely no chipping.

 

David Weiss

 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Dean May
Sent: Friday, March 14, 2008 11:07 AM
To: 'Pianotech List'
Subject: key trimming bit

 

Hi all

 

I am using a Spurlock style set up to trim my keytops and am having trouble
with the plastic chipping out on the notch cutting station. I am using a 1/2
inch spiral carbide up cut bit from McMaster Carr (27395A31). Is there a
better router bit I can be using here? 

 

Dean

Dean May             cell 812.239.3359 

PianoRebuilders.com   812.235.5272 

Terre Haute IN  47802

 

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