Quote:
Originally Posted by Allan Stern
So the "pre loading" is a bend by hand then a set with the hammer? Is that what I am not understanding? Thanks.
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The pre-load force will not produce any permanent bend, but it will be bending the longeron.
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.