Society of Robots - Robot Forum
Mechanics and Construction => Mechanics and Construction => Topic started by: dmehling on July 29, 2007, 12:12:57 PM
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I need linear actuators for two different functions. I need one to elevate a platform approximately 4 inches, weighing between five to 10 pounds and I need an actuator to slide a platform horizontally up to 3 feet, weighing about five to 10 pounds as well. I have done considerable searching for actuators, but most of the ones I've come across are for industrial/commercial uses costing at least $100 for each actuator. My price range would be about $15-$25 per actuator.
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Have you thought about using a motor with a screw thread coupled to the shaft? This would do the job and be inexpensive.
Harry
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That was definitely one of the options I considered, but again I had difficulty finding an inexpensive version of a threaded screw drive. Just tell me where I can find one.
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I have allready made use of this idea in a past project, and i simply used a screw thread bought from a local DIY shop and a fitting nut which was attached to the platform i wanted to move. It worked fine.
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What about a cheap DC motor that pulls a string(s) attached to an overhead pulley?
That will give you linear motion of any distance, plus a mechanical advantage so you can use a cheaper motor.
As an added bonus, pulleys have high efficiency (above 95%).