You can use a bead roller to form it or use a punch die, I think the punch die leave the panel in nicer shape and give a better looking louver. Of course you can't use a punch die on a curve panel where you could use a bead roller.
Each method has advantages.
Outlawed tunes from outlawed pipes
Last edited by 4 Jaw Chuck; 02-17-2004 at 11:15 PM.