Another rule of thumb ...


[Follow Ups] [Post Followup] [Dodge Power Wagon Forum]


Posted by Chriscase [76.201.17.56] on Sunday, October 04, 2009 at 09:52:16 :

In Reply to: Double the thickness is 1/4 the width. posted by Chriscase [76.201.17.203] on Sunday, October 04, 2009 at 01:02:07 :

When bending metal precisely, work to the outside dimensions. Subtract 1 1/2 times the material thickness for each 90° bend. With a press break, you want to center the upper die at a compromise location, 3/4 material thickness shy.

Here's a press break tonnage chart. Note that thicker material takes a wider bottom die. Tonnage goes waaaay up if you use a narrow die and try for a sharper bend.

I used a piece of angle iron for my bottom die. It was a left over bit from replacing the top angle iron on my winch. 2x2x3/8, sawed the edges off to 1 1/2 wide. Upper die is a piece of 1/4", ground to 45° from each side.

http://www.americanmachinetools.com/pressure_table.htm



Follow Ups:



Post a Followup

Name:
E-Mail:
Subject:
Message:
Optional Link
URL:
Title:
Optional Image Link
URL:


This board is powered by the Mr. Fong Device from Cyberarmy.com