On Mon, 29 Sep 2008 21:59:48 -0700, Tim Wescott
wrote:

This machine:

http://www.wttool.com/product-exec/p...oll_WT_Import_

is claimed to be good for up to 20 gauge mild steel.

It seems that 5052-H32 aluminum is the stuff to use, if you're going to
use aluminum.

What thickness of this stuff should I expect a "20 ga mild steel"
shear/brake/etc combo to handle?

One rule of thumb is a 3-gage difference between steel and ally.