key trimming bit

[Michael Kurta]

    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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