On 29 May 2021 12:24:04 GMT, 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?

Depending on how many holes you may need to make and how much you want
to spend, a 'Q-Max' cutter / punch makes a very neat hole.

https://www.cromwell.co.uk/shop/hand...metric/f/64734

Cheers, T i m