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Thread: Ideas for making one of these:
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3rd September 2013, 10:50 PM #1
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Ideas for making one of these:
Hi Guys,
I want to make one of these and I'm just bouncing ideas around how best to go about it.
Leg-Sim cropped.jpg
Will use bicycle parts for the seat and seat stem and handle bars and stem, which I think are normally 22mm.
I have some parts from prosthetics for the 'foot' that has an adjustable 'ankle', that uses 30 mm tube, so I can machine 30 mm rod down to 22mm to interface that to the frame.
That keeps it all three adjustments the same size.( 22 mm ID)
I can get double clamps off ebay to secure all three adjustments. No problem.
So I need 25mm tube with an ID of 22mm ( ie 1.6 mm wall thickness is the closest I can find )
We have a conduit bender at work I can use to make the ~50 mm offset in the main section ( might be hard to see in the pic ) and the ~20° bend in the 'control arm'
I can do the cope on my mill.
The choices for material is mild steel tube or aluminum tube, I guess....
Welding together will be the problem. I need to find a specialised welding business to weld either material , I think.
Unless I can get the steel version brazed together.
Don't know if I know anyone that could weld 1.6 mm aluminum.....
Steel tube will be a bit heavier, but I should be able to braze it together if I can't get it welded....
Aluminum will be lighter...will 1.6 mm wall thickness Aluminum be stronger enough? ( I'm 105 kg ) and can I find someone to weld it? There is a Fire Tender Building business in town, who work with Ali, but pretty sure they don't use 1.6mm material...lol
The total height will about 880 mm.
Oh, yeah, I need it in 5 weeks...lol
Let the brain storming begin.....
Regards
Steve
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3rd September 2013 10:50 PM # ADSGoogle Adsense Advertisement
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3rd September 2013, 10:53 PM #2
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What is it?
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3rd September 2013, 11:04 PM #3
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Al might work but I think steel would be safer.
Michael
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3rd September 2013, 11:24 PM #4
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+1 for steel. Whats it going to weigh?(3kgs?) how much weight would Alum save you?(very little I'm guessing)
I dont see why you need three adjustments.
I also dont really see a need for either tube to be bent(though it might make adjustment a little more tricky)
Stuart
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4th September 2013, 12:03 AM #5
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Is it a pogo stick? or a bar stool?
Cheers,
Joe
9"thicknesser/planer, 12" bench saw, 2Hp Dusty, 5/8" Drill press, 10" Makita drop saw, 2Hp Makita outer, the usual power tools and carpentry hand tools...
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4th September 2013, 12:05 AM #6
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???
What do you do with it?
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4th September 2013, 12:07 AM #7
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4th September 2013, 12:10 AM #8
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A leg simulator
EDLEGSIM - Leg Simulator (U.S. Made) - YouTube
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4th September 2013, 12:16 AM #9
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Wow! What a great design!
Isn't there an issue with patent infringement if you make one yourself? Or only of you make it to sell?Cheers,
Joe
9"thicknesser/planer, 12" bench saw, 2Hp Dusty, 5/8" Drill press, 10" Makita drop saw, 2Hp Makita outer, the usual power tools and carpentry hand tools...
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4th September 2013, 12:54 AM #10
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Hi Joe, Pretty sure you can make anything you like for yourself without infringing patents. Just don't make them to sell.
tinkera
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4th September 2013, 09:07 AM #11
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Originally Posted by Stustoys
Yes,I guess it won't be alot lighter using aluminum.
I guess three adjustments just give a bit more flexibility to cover all size people...dunno.
The rear tube needs the offset to place the c of G in the correct place and the front one is cosmetic, I assume.
I tried to buy one. I even offered to fly over to the US to get fitted out. First email was a 'no' the second got no response.
Steve
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4th September 2013, 10:09 AM #12
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You could build that angle into the turned down section of the foot. Then you have two straight peices of pipe. Though a vertical adjustment will move things horizontal a little as well. I doubt that would be a huge issue. Originally Posted by Sterob
A couple of old road bike frames might be a good place to start. Depending how tall you are of course, the seat tube might just be long enough for what you need(the seat tube normally isnt "oversized" like the down and top tubes.
Stuart
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4th September 2013, 10:10 AM #13
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Aluminum/steel
IMHO, aly would be better: not a great weight saving, but, try carrying around a steel walking stick for a while then swap to an ally one.
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4th September 2013, 10:52 AM #14
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But the tube in a walking stick would be 90%+ of the weight. With this I'm guessing the tube weight will be more like 20% of the weight. Depends how comffy a seat he picks Originally Posted by th62
Also I thinking I'd rather have a brazed joint on steel than a welded joint on alu.
Stuart
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4th September 2013, 11:12 AM #15
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Double WOW I never would have guessed. What a brilliant device.
Graeme
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