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I need to buy or fabricate a strong crankshaft for a strandbeest-like glass robot. Answered

I'm making a walking robot out of glass based on Theo Jansen's strandbeest leg design. Fabricating the crankshaft has proven an odious challenge. I'm looking for a source where I can buy either a complete crankshaft to my specs or parts from which to fabricate my own. It needs to be about 30" long, with 6 crank arms (offset 120°, therefore 2 at each angle), throw on the crank to be 1". My original design was for a 1/2" diameter shaft, which is necessary if it's going to be glass, but if metal the shaft diameter could probably be smaller. The video here shows the crankshaft I made, but I don't  really trust it.http://instagram.com/p/x8xcPeyn-1/?modal=true 

The prototype leg:  http://instagram.com/p/wewqr1yn6a/?modal=true

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HdeP (author)2017-01-27

We are manufacturer of Crankshafts.We are manufactiring all of models.

www.hdeparts.com

info@hdeparts.com

whatsapp contact number:+905304229889

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steveastrouk (author)2015-02-02

Where do you need it sending ? We have a full scientific glass blowing shop at work, I can always ask if one of our guys is up for a bit of a challenge. They are VERY good at what they do. Does it need to be solid, or could it be made of tube ?

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user

Thanks. I'm in Arizona. I'm leaning toward another material besides glass, but if someone there wants to check out those videos attached to my question and give me a quote, I'd consider it. They ought to be able to make it out of rod, which will be stronger.

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user

Let me have a drawing - send me a link in a PM and I'll ask.

The guys in the shop were intrigued.

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user
Wired_Mist (author)2015-02-02

SS does souns kinda kewl >>

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user
petercd (author)2015-02-02

Thats some serious glass skillz you got there. If you feel the glass crank is a bit dodgy, perhaps a shiny stainless steel one would do the trick without spoiling the glass look too much.

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user
bandhudunham (author)petercd2015-02-02

Thanks. Know where I could get one made at a reasonable cost?

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petercd (author)bandhudunham2015-02-02

If you don't have a propane/mapp torch and dont fancy banging red hot metal in a vise, then probably a small engineering shop might be able to fab it up for you.

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Wired_Mist (author)2015-02-01

You won't just find one, and if you do it will cost a small fortune, If it gets to your door intact... Sorry

You thought of using Poly-Carbonate? still crystal clear and much stronger! To bond it you only need a special glue that fuses it together. sounds a bit safer too lol

Hope to see what your making :D

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user
bandhudunham (author)Wired_Mist2015-02-01

Got any clever ideas on jigging it up to keep it all straight?

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user
Wired_Mist (author)bandhudunham2015-02-01

Might be easiest to build a few 2-D U-shaped sections, then bond them together, offsetting each section say *90( depending on ur app)

With poly carb you will just need to heat it with a heat gun and it will bend, not sure with glass. Make a form to bend the materiel around. Then you would need to sand the junction between the two sections flat and bond them together

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mikeasaurus (author)Wired_Mist2015-02-02

Poly is a great solution. I came here to say the same thing!

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Kiteman (author)2015-02-02

Oh, that is a thing of true beauty!

If you're not going to go with your own glass shaft, I'd second the polycarbonate/acrylic suggestion - a decorator's heat-gun should be able to soften it so that you can bend it at specific points and then let it cool (much like, I am sure, you bend a glass rod with a small blowtorch flame).

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