Rowland, Richard,
Surely you don't have to go high - tech for small volume work? Light Aero
spares do an inexpensive trepanning cutter - which works well on aluminium
as long as you mark the work piece accurately, ensure that the pilot drill
is set so that the tip of the cutter aligns with the shaft of the drill, not
the flute (otherwise you risk enlarging the pilot hole) and drill vertically
to the surface at slow speed (I used a carpenter's brace - low tech!). I
admit, I took no risks and finally hand filed the holes for the last mm with
a semi-circular file
Regards
Roger Mills
-----Original Message-----
From: owner-europa@post.aviators.net
Carson
Subject: Re: Holes in panel
>I understand that the main 6 instruments are best served by a hole 3.16
>inches, just larger than 3 1/8.
>
>Spruce have a 3 1/8 hole cutter which I'm sure will do the job.
The 3.125" holesaw available for loan to Europa Club members is a
tungsten carbide grit type, so is unsuitable for use on aluminium
(I've tried it without success). It works fine on GRP, though.
Does anyone know if there are any of the water-jet or similar cutter
shops in UK?
regards
Rowland
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