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?

QMAX punches were the goto solution in the days of valves and valveholders

https://www.cromwell.co.uk/shop/hand.../p/QMX0451114Q

£11.50. A snip!

Unless you have a tame sheet metal workshop with old hand presses and
punches, that is the bees ********




--
"Women actually are capable of being far more than the feminists will
let them."