"Yin-Yang" nesting telescoping extrusion
"Yin-Yang" nesting telescoping extrusion
(OP)
Working on a project that requires a sliding, telescoping element. Tubing isn't quite accurate enough. I'm looking at extrusions. If I can make this work, I can double the volume of ordered extrusion and eliminate one profile...
What I am hoping to find (or design, if necessary) is a shape that can nest and telescope within/around itself, leaving only 1 degree of freedom of axial sliding movement.
Anyone ever see anything like this?
p.s. Yes, I Googled the living snot out of this already!
What I am hoping to find (or design, if necessary) is a shape that can nest and telescope within/around itself, leaving only 1 degree of freedom of axial sliding movement.
Anyone ever see anything like this?
p.s. Yes, I Googled the living snot out of this already!





RE: "Yin-Yang" nesting telescoping extrusion
Two extrusions shaped sort of like a lowercase 'a' can, I think, interlock with each other and slide. Because of the closed tube section, they can have reasonable torsional stiffness, but their centroids can't be colinear, so the combined column will have some flex in bending.
I did something topologically similar once, laser- cutting a generally C- shaped detail in the edges of sheet metal components such that the edges could be locked together with a short bolt and fender washers, so I'm sure it can be done.
Mike Halloran
Pembroke Pines, FL, USA
RE: "Yin-Yang" nesting telescoping extrusion
Pic and SW Part/Assembly attached.
http:
-handleman, CSWP (The new, easy test)
RE: "Yin-Yang" nesting telescoping extrusion
RE: "Yin-Yang" nesting telescoping extrusion
RE: "Yin-Yang" nesting telescoping extrusion
RE: "Yin-Yang" nesting telescoping extrusion
RE: "Yin-Yang" nesting telescoping extrusion
RE: "Yin-Yang" nesting telescoping extrusion
RE: "Yin-Yang" nesting telescoping extrusion
RE: "Yin-Yang" nesting telescoping extrusion
Take a look at telescoping drawer slides, maybe that might give some idea's about holding a nice tight tolerance torsionally that gets away from the traditional extrusions, or it may just be a different style than what you're thinking.
Without knowing your application or seeing concept sketches I can only guess about a better way.
James Spisich
Design Engineer, CSWP
RE: "Yin-Yang" nesting telescoping extrusion
RE: "Yin-Yang" nesting telescoping extrusion
Cheers
Greg Locock
I rarely exceed 1.79 x 10^12 furlongs per fortnight
RE: "Yin-Yang" nesting telescoping extrusion
Still, management gets shy about tooling cost. Anything off-the-shelf really helps.
http://www.EsoxRepublic.com-SolidWorks API VB programming help
RE: "Yin-Yang" nesting telescoping extrusion
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RE: "Yin-Yang" nesting telescoping extrusion
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RE: "Yin-Yang" nesting telescoping extrusion
In small quantities, it could be press-brake formed, but you'd need some tooling like that made for pressing hinge knuckles. To restore the torsional stiffness lost that way, you could stitch-weld it, where the triangle in the extrusion is, or laser-cut the blanks with rectangular slots there and mating tangs on an edge, in which case closing the knuckle would also engage the tangs in the slots. It's scary tinwork, but it can be done.
Mike Halloran
Pembroke Pines, FL, USA