Main hoop bend

[V2 - Italy]

How do you bend the main and the front hoop?

How do you check the geometry obtained and which tolerance do you accept?

Firenze Race Team V2

http://www.firenzerace.too.it

DUCATI POWER at the UniversitÃ* di Firenze

[V2 - Italy]

How do you bend the main and the front hoop?

How do you check the geometry obtained and which tolerance do you accept?

Firenze Race Team V2

http://www.firenzerace.too.it

DUCATI POWER at the UniversitÃ* di Firenze

[Ben Beacock]

we used a pro-tools MB105 bender (slightly older model) with a 1" x 3-1/2" radius die. It was completely kink free on 0.095" wall seamless cold drawn tubing.

I had drawn the main and front hoop in I-DEAS, then extracted the angle,curve length and distance between curves from the drawing. On this particular bender, the bend won't start exactly from the edge of the die so we needed a test piece to measure where it started.

Our main hoop was 5 bends, 2 of which were not on the same plane(compound angle). The accuracy was about +/- 2mm.

web page (http://www.pro-tools.com/mb1053.htm)

Ben Beacock
Chassis Design and Technical Coordinator
Gryphon Racing - University of Guelph

[-Gabriel]

We deal with a local "precision pipe bender" company present in Quebec and Ontario, Canada. They usually deal with industrials and manufacture steam generators, heat exchangers...
It's not to expensive if you can deal the prices a little bit, especially if all your radius are the same (one set up necessary).
Our main hoop is the same type as Guelph's team, 5 bends with 2 coumpound angles. The result was good.
I suggest you to check for a company like this in your neighborhood and verify if the time saved/precision gained are worth the money.

Gabriel Denoury
Ecole Polytechnique de Montréal FSAE
www.fsae.polymtl.ca (http://www.fsae.polymtl.ca)

[Courtney Waters]

We use a JD Squared (jd2.com) bender. A variety of dies are available. To measure we use a variety of protractors, tape measures, squares, a digital level, and a whole lot of trigonometry http://fsae.com/groupee_common/emoticons/icon_smile.gif Accuracy, like all student-fab'd stuff, is as good as you can get it. The digital level gets us in the +/- 0.1 degree range on bends and usually 1/16" or less on dimensions. All suspension hardpoints and critical chassis members are located with a carefully measured & constructed jig, which we usually keep within 1/32".

Courtney Waters
UCD Formula SAE