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[Passenger]

Even more so is machining the die sets to get a large radius out of 6061 tube

[rawr]

how large of a radius do you need. just roll the edges.























EVERYTHING NEEDS TO BE CNC CUT ON A 1M DOLLAR MACHINE

[Passenger]

Lol I wasn't suggesting this needed to be cut with a CNC in the slightest. Problem is with 6061 tube, in say a 1.5" diameter, is that you won't be able to roll more then .5" to .75" rad, and that is in T0. Ideally you would want at least 1" or more for that size tube.

[rawr]

then press the tops out of sheet and weld them to a tube like a boss

[rawr]

I'll come work in your shop and make it 300% more efficient for 60k a year

[Passenger]

I'll come work in your shop and make it 300% more efficient for 60k a year

Come on over then.

[turbob16hatch]

then press the tops out of sheet and weld them to a tube like a boss

Lol you talk like building fixtures and tooling is free. Not sure if serious or just trolling.

[slappynuts]

Its not a big deal if you have a lathe. The tooling is generally made on the same lathe as the spinning is done on.

[rawr]

When do I start, bossman?

[Joseph Davis]

and time

[Passenger]

When do I start, bossman?

February, provided your resume is impressive enough.

[slappynuts]

Here is what I ended up with. This is 16ga and I believe its 6061 that was annealed with a propane torch. The problem I ran into was the material work hardened very quickly and the tooling wasnt exactly ideal either.



After sharpie burned off.

[Passenger]

Aluminum doesn't work harden, you should be able to form that piece a lot more, the issues is that you still have a lot of temper, that part must still be close or at T6. Anneal it in an oven or better yet get a piece of 5052 and anneal that to T0, you will be amazed how much easier it is for you to spin. (will machine like a gummy mess in T0 just so you know)

[slappynuts]

I will see if they have any 5052 drop next time I go and I will give that a spin.

[Joseph Davis]

All the Locost guys I've seen forming the rear body re-anneal several times during the course of forming, particularly where the skin is expected to wrap around the rear bar.

[TurboVFR]

Hey, Chuck, for the velocity stacks.. What about taking a trapezoid-ish shaped piece of sheetmetal and wrapping it around your form the tig'n it up?  As long as theres no absolute necessity for it to be all one piece, functionally, I see no difference. And after dressing and polishing you probably wouldn't 'see' a difference either. I know its ghetto, but I thought the original criteria was 'CHEAP'.


When the place I used to be with was making these, we had the inner and outer stacks CNC'd, but it was big money.


Believe it or not these twinstacks kicked ass for a while, and put a couple bikes to the top of their class.

[jabberwock]

Anneal alum
make simple steel dies like rawr suggested
HF press

[slappynuts]

I did anneal it,but it could probably use a little more heat. If you look at the pics I sharpied all over the part and then burned it off with the propane torch. I think it just needs more heat and a longer cool time.