Hi people. I'm trying to figure out how to build a rotating platform thats powered by an electric dc motor. Basically i want to spin this platform say 1 m in diameter, and it's got an object on top of it. Like say anywhere from 5 kg to 50 kg or even maybe 100 kg. What i know for sure is that i'm interested in using a worm wheel type gearing. I've looked around at dc motors and power in the 100's watt/kw range... The problem is i just don't know how big a motor or should i say powerfull i need to use , before i go out and buy one and realize it's too small/weak. Thing is i need it to rotate the platform both ways at a max 60 rpm. but it needs to be able to switch direction fast....thats why i'm planning on using a worm gear ...to be able to gain a lot of leverage and i also have to option of moving it slower and like have a very good degree of precision. So how do i calculate the watts needed... if i go with a 1500rpm motor times a 25 reduction worm gear..that gives me 60 rpm, so that i can change it's direction ...i want it to be snappy , like resemble a pan/tilt thingy used for cameras. Edit. So like 0.5...1...1.5m diameter (let's consider the weight on it sort of well balanced for simplicity) 5...50..100 kg weight dc motor initial rpm doesn't really matter cause i can always find a proper worm drive to get it down to 60 rpm.