I need some tips on selecting motors for an art project that continously rotates five different circular platforms (10” diameter, 15 lbs) 360° in one direction, then in the reverse direction. The complete rotation of each platform should take approx 30-40 seconds (not critical). A direct drive approach would be preferred (seems simpler), but I could use a gear reduction scheme if it were more cost-effective.
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Because you say the load is 35 lbs, you probably need a heavy duty drive with bearings to support it. While the unit listed below is expensive, $180 USD, it will do the job.
This cheaper motor might also work: https://www.surpluscenter.com/Brands/Parvalux/30-RPM-50-Volt-DC-Parvalux-Gearmotor-Single-Shaft-5-1549.axd