"Wally" wrote in message
. ..
Andy Evans wrote:

I'm assuming that I should cut out main holes before
anodisation - holes for tube sockets and XLRs for instance.

Yes.


But then I
should drill holes holding the top plate to the chassis after
anodisation so the screws make contact with the aluminium. This sounds
logical doesn't it?

You could drill the holes before anodising, and tap them afterwards. That
way, if there are any mishaps during the drilling, you aren't adding the
price of anodisng to the scrap box. (The taps should cut through the
anodised surface insde the holes without difficulty, BTW.)

It is much better practice to drill and tap before anodising,
and then fit plastic machine screws into these threads, to keep
tjem clean.

Then you do not need to put your anodised panel under the
drill press any more. I have learned this the hard way:-)

Iain