Slider rail length and weight capacity queries...

D

Dave Draper

Well-known member
Here's an engineering question for all you tech-heads...

If you have two parallel stainless steel 19mm OD tubes, each with a 1.5mm thick wall, supported at each end, with a 10kg camera rig rolling back and forth, how long could you have the tubes before they start to bow under the weight?

DD.
 
Dave Draper said:
Here's an engineering question for all you tech-heads...

If you have two parallel stainless steel 19mm OD tubes, each with a 1.5mm thick wall, supported at each end, with a 10kg camera rig rolling back and forth, how long could you have the tubes before they start to bow under the weight?

DD.
Click to expand...

You forgot one metric, how long are the tubes? lol
 
Well, technically, if you hang a weight from a rod supported at each end, it will always bow a little -- increasing the length or weight or decreasing the stiffness of the rod will make it bow more. You need to specify how much deviation from perfectly flat is acceptable as well as all the other parameters. You also didn't state the material of the rods -- aluminum, steel, carbon fiber, etc. will all be different.

- Greg
 
Which is why he wrote stainless steel :laugh: The easiest way to find out would probably be to test it. Two pipes on a couple of bricks or books and a weight.
 
that is a very tough question to answer given all the variables. There are many grades of stainless steel. Which one you have we don't know. What are your tolerances? I wouldn't waste any more time trying to sort it out here, take some weights and perform some real world tests.
 
Jeremy_Sawatzky said:
that is a very tough question to answer given all the variables. There are many grades of stainless steel.
Click to expand...

I'll be going with 316 grade stainless steel.

Jeremy_Sawatzky said:
Which one you have we don't know.
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I don't have any tubes / rods yet, as they are rather expensive, and I don't want to make the wrong purchase.

The wall thicknesses available to me are 1.22mm, 1.63mm, 3.25mm.

Jeremy_Sawatzky said:
What are your tolerances? I wouldn't waste any more time trying to sort it out here, take some weights and perform some real world tests.
Click to expand...

Real world tests would be ideal, but as above, I don't have the tubes / rods yet.

DD.
 
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