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

[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.