Largest brake discs

[MissTaniaThomas]

I’m trying to commission a company to turn a crankshaft into a dining table, and ideally I’m seeking advice on a oversized brake disc as a foot.

Now I’m aware some of the larger ones at 400 and 450mm, but how big do they ever get?

[MissTaniaThomas]

Ideally, I’d be seeking a scrap or used disc, keeping the costs low...