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Discussion in 'Hacks' started by m_cliffhanger, Nov 4, 2016.
Is there an advantage to that style of bender compared to the one I am more familiar with:
Thank you, both.
I don't have any drawings, but I can take some pics and measurements. It will depend on the bottle jack that you will be using. The key is to make sure that the die can travel through the full length. On thicker tubing (1 1/2 x 0.120) I can only get about 87*, due to springback. But with a bit of fiddling, I can get the full 90*.
You sure can get a lot of work done with the little guy.
I'd like to see a few more pics of the bender. There are a few shop built one on the net, but seeing another is always useful. It will be a while before I build one but it is on the short list.
HighOctane, I'll take some tomorrow.
RoundOz, my apologies. I didn't read your question properly. I thought it was a statement.
This type of bender is meant for pipe, and will kink the tubing very easily. I have heard of it being used successfully, but with a number of modifications, and only on shallow bends. A proper die will maintain the integrity of the tube, and especially for a roll cage, I wouldn't take the chance.
Here are some dimensions:
9 1/2 x 9 1/2 x 28 outside
Die pin 12 1/2; follower pin 4 and 5 1/2 from bottom
Top bolt 27
Jack base to die 3 1/4
The square tubing is 2 x 2x 0.125 and the pins are 1" cold rolled. The critical dimensions are the relationship between the die pin and follower pin. It has to be close enough for the tube to slide in, but closer together will give a tighter bend. You can see that I made a second setting for the smaller tubing. If I were to do it again, I would have several settings for the follower pin.
Hope this makes sense.
You can see the forces involved. The top bolt is a grade 8, 1/2 in bolt.
Thanks. Doesn't look too hard to build. It will be a while but when I get too it I might ping you for some more info.
These days there are shops that specialize in CNC bending as well as CNC Laser notching. My youngest son has a welding job at a off road race car shop building chassis. The parts for the chassis comes in to the shop on a pallet with everything pre-bent and notched, the parts even have laser etched part numbers on each part!
IKEA sells race chassis, who knew!
Yep, pretty neat stuff. Check out VR3 Engineering. I looked into them when I was planning on building a Bearhawk (tube and fabric fuselage). They take the plans and your platinum credit card, and voila, a few weeks later a box of perfect tubing. The problem with my builds are my CAD files. Somehow their CNC machine can't read my cereal box cut outs; amateurs.
He's at Armada Engineering.
Pallet O' Parts:
Sewing it up:
I believe these young guys are all using Solidworks for their design & CNC files. Solidworks allows stress analysis of the drawing.
If we could get them to pre-bend and pre-notch the tubes for these , there would be High performance Sidecars for the masses.
Easy peasy, get your checkbook out and we can make that happen!!
Sounds like an investment opportunity for davebig!
And , there's the rub.
It almost seems a shame to take something that pretty out and beat the shit out of it.
There lies the trouble Mericans don't like to pay for that stuff ! They want to go see Jay or Claude and be told what they want to hear ! Then be Capt Merica (walter mitty) Though some of you actually pull it off !
The Yankee engineering Bills built some interesting sidecars evidently no one wants to pay for one. I talked to Hannigan a couple times wondering if they retained enough parts or plans to build anymore of the Kawa based center hub rigs, but one has to talk to Mr's Hannigan and she won't return your calls or emails.
Seems we are a Non Market for that sort of hardware.
Too broad a brush , Dave.
All 3 of these were bought and paid for by Americans. Of course they are a tiny percentage of sidecar owners who are a tiny percentage of motorcycle owners who are a fairly small percentage of vehicle users in America.
Sure on sunny perfect days it seems bikes come out of the woodwork , but , in Winter how many do you see ?
I get a somewhat perverse satisfaction of being the only guy out riding when it's below 50 degrees or when the roads are wet . Face it , as a nation , we have gotten soft and that is the greater problem.
I'm out there riding with you! 35 is my cutoff since I got my heated grips. that's on my 2-wheeler though. once I get my Concours/sidecar I'll be doing it with 3!