"All the sheet metal knows is PSI at the contact patch" - that makes sense, Kerry; and I've been reading this thread from a couple of years ago: http://allmetalshaping.com/showthread.php?t=10337

Thanks for the invite, also.

This is too advanced a topic for a newbie like myself anyway. The best way I'll learn the background of what everyone is discussing is practicing. There's an English wheel at an auto skill center I have access to a couple days a week, and the "adjusting dial"/jackscrew/turning wheel thing is on the bottom.

Peter, I am sure there is a huge joke in your statement that I'll learn about soon. For now, I haven't even learned the machine's nomenclature... All I know is it's a lot quieter (& easier) than me hammering!

Brad, the normal name is 'kickwheel' for the lower adjusters and 'handwheel' for uppers although some folks just say something like 'tighten the adjuster'.

Welcome to the site Brad!

Brad
I thought you meant that the lower turning wheel had a dial on it ( like a pressure indicator dial)
Peter