"Jim Lesurf" wrote in message
...

However as Iain has pointed out, note that the anodising produces an
*insulating* layer on the surface. So mask off any areas which you need to
ensure remain conducting for ground contacts, etc - or be prepared to
abrade them clean of anodising afterwards.



Jim. This point was brought home to me when looking at the construction
of a pre-production audio workstation, just recently.

The chassis (four of them) were of slab construction,
6mm anodised aluminium. In the lower right hand corner of
each plate was a tapped 4mm hole, with a bright steel machine screw
a tag, with serrated washer, and a ground wire going direct to
the chassis star ground.

Iain.