Drilling/cutting a 30 mm hole in 0.8 mm aluminium

[wasbit]

A lot of people use the paper catalogue to look up part numbers because it displays items in sensible categories, then revert to the web pages.

[The Natural Philosopher]

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

£11.50. A snip!

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

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[Bob Eager]

That too!

[Steve Walker]

I used one of these:

last week to drill 40mm holes into an alloy casting.

[williamwright]

Clamp it between two pieces of stout ply and drill through the lot with anything.

Bill

[ARW]

Interesting sizes. 50mm could be useful for me.