Quote:
Originally Posted by Ken Joe 5625
I'm sure any moped motor would work just fine.
however I'm sure a K series motor out of a student or mentors Honda would also work.
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Please try to be actually helpful or just don't post.
For to the original question:
As Nemo said, it depends on the motor and the gear ratio. If you gear down a motor enough, it can lift anything, as long as there's no friction in the gears. Practically speaking, a 1000:1 over all gear ratio is the biggest you'll probably ever see in FRC. And that would be sloooow.
Firstly, Ken Stafford has a good (but long) video on
how to pick a motor and gearbox.
Secondly, here's a link to the
2015 Motor Performance Data that you can use with the info from Ken's video to pick a motor and gear ratio.
If you want the short version, one of the fundamental equations is:
Power = Force * Speed or,
Speed = Power / Force
You want something that will lift 70 lbs of force. A CIM motor's max power is 330 Watts which
Online Conversion tells me is 244 foot-pounds-force/second.
So, 244 / 70 = 3.5ish. A CIM motor geared for max power can lift your load at 3.5 feet per second, assuming no friction or losses. It's usually better to assume losses and to not aim for exactly maximum power, so a safe bet is to cut that in half and say a CIM motor can lift 70 lbs at 1.75 feet per second.