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michilson
08-24-2010, 10:40 AM
Hi guys,

I am looking to build a couple props this year using steel tube that when powered with a pneumatic will move.

I'd like this to be about the height of a chair then jump up to about 7' tall.

Does anyone have a website that will be a starting point for the design of the 4 link design to get the math and angles for me.

I have seen a couple that i can drag the mechinisum to see its movement.

Thanks Guys!

Allen H
08-24-2010, 01:23 PM
here are some great sites
http://www.flying-pig.co.uk/mechanisms/pages/linkage.html
and more specific to what your asking
http://www.mechanisms101.com/fourbar01.html
I find these links to be indespensible in the design phase.

gadget-evilusions
08-25-2010, 10:46 AM
If you can reference a specific prop I could give you approximate dimensions. I don't give out exact dimensions and tolerances on props I build, but generally don't have a problem sharing linkage lengths and cylinder strokes.

There is a 4 bar simulation software package here , http://www.boopack.com/software.html , that is free.

Also using an engineering program like autocad or solidworks, or even google sketchup helps. I design all my props in Autocad to make sure the dimensions work before I start cutting steel.