View Single Post
  #10  
Old 02-16-2019, 12:29 PM
crystallographic crystallographic is offline
MetalShaper of the Month October '14 , April '16, July 2020, Jan 2023
 
Join Date: Dec 2010
Location: Western Sierra Nevadas, Badger Hill, CA
Posts: 4,388
Default

Quote:
Originally Posted by Bart View Post
Slowly getting there.
Need to clean up more

Attachment 51404
So you are making a stepped part.
And the guidelines for corners:
inside corners need flanges stretched
outside corners need flanges shrunk


When you are working a series of outside-inside-inside-outside corners, you need to anticipate your flange movements- and in your case you will see puckers outside the steps where metal wants to gather up- and tight/tearing areas where it wants to stretch.
And that is what you got.
So, as you force the metal down into your steps, you also have to work at the 90deg angles to those steps, and it becomes a bit of a tangle until you see what is coming, and work ahead of the disasters.
So - not an easy straightforward part, but it is one that others have done, successfully, here on this forum.
__________________
Kent

http://www.tinmantech.com

"All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919.
Reply With Quote