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%&*~ 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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