On 29/05/2021 13:50, David wrote:
On Sat, 29 May 2021 13:29:58 +0100, Fredxx wrote:

On 29/05/2021 13:24, David wrote:
I need to cut a 30 mm hole in some 0.8 mm aluminium.

I have various hole cutting devices such as Forstner bits but they are
for wood.

Is there anything clever for cutting holes in metal sheets?

Any metal cutting hole-saw should be fine. Use oil to stop the aluminium
balling though with just 0.8mm it's only marginally necessary.

Ta.

Having trouble locating a 30 mm one at the moment.

I have also looked at hole punches.
Apparently you drill a pilot hole, insert a bolt, then tighten the cutter
down.
Again not finding 30 mm size.
[At least, not with fast delivery.]

Screwfix have a couple in stock, but you will need the arbour to suit:

https://www.screwfix.com/p/erbauer-m...saw-30mm/5420v

https://www.screwfix.com/p/bosch-mul...saw-30mm/651gx

As others have suggested Qmax cutters leave a good finish. After looking
at the links T i m has given they seem good value for money.