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Re: [Amps] Heat spreader for solid-state amps

To: AMPS <amps@contesting.com>
Subject: Re: [Amps] Heat spreader for solid-state amps
From: Duane B <d-brantley@sbcglobal.net>
Date: Tue, 29 Aug 2006 11:24:05 -0500
List-post: <mailto:amps@contesting.com>
Thanks for the replies.  I'll definitely keep this in mind.

Thanks,
Duane
W5DMB


Peter Chadwick wrote:
>
> Duane said:
>
> > Both are 6" x8", but one is 3/8" thick and the other is 1/2" thick.<
>
> Bear in mind that copper is a bit of #*@#Â% <mailto:#*@#%C2%A4%>&*~ to 
> work with. It tends to easily bind up drills and taps, so you really 
> want to grind drills to have a bit of negative rake, although I can't 
> grind drills offhand well enough to do that with any accuracy. It 
> certainly 'binds' taps, so using a slightly larger hole than usually 
> recommended can help. Be careful, too, of any sharp edges giving you a 
> cut, as cuts from copper are, for some reason, notoriously subject to 
> infections.
>
> So if you're looking to use screws passing through clearance holes, 
> the 3/8 thick might be better - if the screw holes are a bit off 
> square, it mightn't be so much of a problem. If tapping, the 3/8 needs 
> less threads...........Also, this is definitely an area where standard 
> US machine screws have an big advantage over the finer thread metric 
> ones. (Personally, I don't know of a situation where they 
> don't..........I don't like metric threads!)
>
> 73
>
> Peter G3RZP
>


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