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ppp
Lv 5
ppp fragte in Science & MathematicsEngineering · vor 1 Jahrzehnt

How to calculate the torque for a motor for a 24" scissor lift?

What kind of reduction gear motor would I need to do this. I would prefer 120vac operation so I don't have to fiddle with batteries or inverters. This is going to be used in a workshop to raise and lower the height of the top of my workbench. I have seen this done with a battery powered drill btw, but I want to have it self contained.

A typical 24" automobile scissor lift has no motor. I want to add one. It will need to lift around 500 pounds about 14 inches in about 30 seconds to 1 minute, from an initial height of 10 inches to the fully extended height of 24". I plan on mounting the motor on the nut end of the threaded rod (acme 1/2" - 10tpi). A jack that size can handle up to 2.5 tons, so that is not a problem at all. But I don't want to have it under powered either.

How would you calculate that?

Update:

@Jon S- "Wouldn't a hydraulic solution be a lot easier? As in motorcycle lifts?"

I considered it, but too shakey and expensive. A woodworking workbench needs to be rock solid. The jack is just to get it to the right height. I have other methods of locking it there.

Thanks though!

Update 2:

I went to eng-tips.com and they had a whole thread about this exact subject. A WAG says about 40 foot pounds, as these jacks are made for little old ladies to change a tire. Works for me. And I will likely be able to get by with a cheap dedicated electric drill from HF.

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