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1. 07:19 AM - Bending Square Tubing (Howard Williamson)
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| Subject: | Bending Square Tubing |
Gregg,
I used the following method to bend the square tubing for new I-Struts on my
Skybolt:
I started with two pieces of square tubing that were slightly longer than
needed for the upper and lower square tubing components of the I-Struts. I
formed one piece from each end of the tubing-two lower contours from one
piece and two upper contours from the other. The reason for using the long
pieces of tubing was have the leverage needed to form the pieces.
I then used a clamp to hold one end of the tubing down to the work surface
and a short length of iron pipe that I could place under the tubing at any
location. I then used a gas welding torch to heat the upper surface of the
tubing and slowly formed it to the correct contour by moving the pipe back
and forth to different positions and pushing down on the other end of the
square tubing-simply heating and stretching the upper surface. I worked it
slowly and checked the bend against a template that could be laid on top of
the piece as I formed it. If necessary you may have to place something
under the pipe to provide enough vertical space to allow the tubing to flex
downward enough to stretch the top to the correct contour. Remember, the
steel will contract as it cools so you will need to take that into
consideration as you get to the final steps of the forming. The end result
was a nice smooth bend on each component that followed to rib contours
nicely.
I then cut the two pieces from the long tubing and finished the dimensions
on each end-the diagonal cut to allow the installation of the bolts.
Hope this helps.
Regards,
Howard
_________________________________________________________________
Time: 09:26:41 AM PST US
From: "Gregg Costabile" <gcostabile@embarqmail.com>
Subject: Pitts-List: I-Struts and tube bending
Used heat to bend the bottom longerons. Trying now to build the I-struts.
Anyone ever bend square tubing? Tips are greatly appreciated. -Gregg
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