Originally Posted by Slapz
Are mandrel bends stronger for doing say roll cages and frame re- inforcements? Need to make a cage and re-inforce my frame, if mandrel bends are stronger would it be wise to buy a bench of bends in the right diameter then weld them to the straight pieces? I'm thinlking of buying one of those China hydraulic benders from Harbor Freight, Anyone ever use one? Are they worth it? Thanks, Slappy.
The very best price for a nice rollbar or rollcage begins with buying a tubing kit from one of the suppliers.
By the way, the 8-point structure that you see in this link is a rollbar, not a rollcage...
Click on Drag Roll Cages....
There are others of course,
The other thing is, if you're not a certified aircraft welder, DO NOT weld it yourself. Tack if together and then call a dude with a portable rig to do the welding for you.
I wrote a piece on rollbars a while back for the wiki. Then I retired and have not kept up with the current rules for this year, but the rules and procedures that I outlined when I wrote it will mostly be valid. Get a current N.H.R.A. Rulebook from Jegs or Summit. Read it.
Here's the piece on rollbars...