Gary,
Yea I have a full set of punches I use now. For smaller holes, I was trying to
find and easier way to create them. I found a set of TIN coated Forstner bits
on sale for $7.49 going from 1/4" to 1" with 3/8" shanks. They had new chassis
punch sets pretty cheap too, around $20 a set. I remembered reading about
someone using those Forstner bits I think in a book I have. If the work, it
might make quick work of hole making compared to using cone bits.
Best,
Will
Amateur Transformer & Supply
Power and RF transformers for amateur radio.
----- Original message ----------------------------------------
From: Gary Smith <wa6fgi@sbcglobal.net>
To: <craxd1@verizon.net>, <amps@contesting.com>
Received: Mon, 01 Aug 2005 16:43:15 -0700
Subject: Re: [Amps] Chassis construction question
>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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