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Longerons bending
Thanks to everyone who has offered help. I am not a novice at this as the 12 is my third RV, however my first two were quick build kits. Any time saving method I can find I try to utilize. I am getting the dies and if I only use them once then I have another tool. I have got a formed left longeron that still needs a little twist that the die will make better.
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Take a look at this page
Step: 02, 03 and 04 This was easy and worked out fine. about 1.5 hours. http://joesrv12.com/Builder%20Log/bl_23_02.htm Quote:
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If you remove the pre-load, the angle will go back to the position it previously was. The pre-load can be applied 24 " from the point the actual bend is desired. The wrap with the dead blow hammer close to the vise is what converts the pre-load into a concentrated bend at the end of the vice jaws. It has been a while since I bent any longerons but my guess would be that at 24" the desired pre-load deflection would be on the order of 1". For the sharp bend at the aft end of the longerons (which the bending dies wont do), you can just keep repeating the same bend process as used to make the curve.... keep making small bend increments in the same spot without re-positioning, until you have the desired angle. |
That is what I did.
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Good luck! |
Bending
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My experience was that it helped to have a friend apply the pre-load and then I applied the dead blow hammer. Recommend that the pre-load helper wrap the longeron in heavy gloves or towels. Otherwise that first heavy hit is a real zinger on the hands!
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