Will:
They are a bit on the pricey side. I had the need for one, (it was $14.95, a
full set had me reaching for the Tums,) seen the cost, took to making a small
hole and then my Dremel tool did the trick.
I have only used Forstner bits on wood, fwiw.
Maybe you scour ebay for a set of Grinnell chassis punches?
A set of them shouldn't be worth too much in this solid state, surface mount,
pc board world of modern electronics nowadays.
Just a thought.
73,
Gary... wa6fgi
----- Original Message -----
From: Will Matney
To: amps@contesting.com
Sent: Monday, August 01, 2005 4:25 PM
Subject: [Amps] Chassis construction question
Has anyone heard of or tried using Forstner bits for swich holes, etc in
chassis construction? I had read an article somewhere about using them on
aluminum chassis but didn't mention something like 20 ga. mild steel. I wonder
how it would work in either, especiall using bits with a TIN coating? I could
see how they wouldnt really need a starting hole, maybe just a spot from a
center dril to make a big hole like Trepanning. What I use now is either cone
bits, or chassis punches driven with an electric impact wrench. The larger cone
bits require a starter hole like 1/8" and of course the punches have to have a
hole to match the bolt. Any comments on these Forstner bits would be
appreciated.
Best,
Will
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