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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