pic: The BoltBots Team 5040 Robot week 3 in the build !

[GortGortGort]

Originally Posted by earlybird

If you are still testing winch motors my team has had much success with a CIM motor attached to a gearbox from a Dewalt drill. There is a whitepaper out there somewhere on it. I believe Dr. Joseph Johnson(one of our old mentors) made it but I'm not entirely sure. We used this set up during breakaway to lift our entire robot off the ground with no trouble at all.

Thanks for the information I will show this paper to the build team . Looks like a option they did not think of ,and best of all I think I have one of these some where in the shop that the motor is burned up in . So it would meet the teams goal of recycled material.
http://www.chiefdelphi.com/media/papers/1592

[lamk]

For our elevator we are using a CIM with a 25:1 Vexpro VersaPlanetary gearbox driving sprocket and chain. The sprocket's pitch diameter is 1.79 inches. With a 40 lb load we can go up at 1.3 feet /sec measured. Our Pid controller puts out 15 % motor power to maintain the 40 lb load at set point. With 20lb load there is no motor output at setpoint with the talon set to brake.

[GortGortGort]

Originally Posted by lamk

For our elevator we are using a CIM with a 25:1 Vexpro VersaPlanetary gearbox driving sprocket and chain. The sprocket's pitch diameter is 1.79 inches. With a 40 lb load we can go up at 1.3 feet /sec measured. Our Pid controller puts out 15 % motor power to maintain the 40 lb load at set point. With 20lb load there is no motor output at setpoint with the talon set to brake.

Thanks Ken,
Very good ideas and looks like your team has done a lot of research on the gear box design . Our team is composed of 95% new kids this year and they need all the advise can get. They thought about chain drive but are leaning to using a wire cable and winch design for the lift.