lift winch ideas anyone?

[Alex Cormier]

This would do fine, in fact I was playing with the one we bought for our lift system today. Small, light, cute.

http://www.grainger.com/Grainger/items/6Z001?Pid=search

[joek]

we use pneumatics to lift up the hook, and a winch to pull us up, somehow driven by a CIM

[terryo]

Originally Posted by Alex Cormier

This would do fine, in fact I was playing with the one we bought for our lift system today. Small, light, cute.

http://www.grainger.com/Grainger/items/6Z001?Pid=search

We're using a similar winch driven by a CIM and toughbox using sprockets and chain. A bifold arm driven by 2 Denso's extends the hook, a pair of cylinders lifts up the front wheels, we drive up against the bar and lower the cylinders to attach the hook, then retract the arm and start winching. 2 " dia drum on the 3.1:1 winch gives us over 400# lifting force and gets us above the platform in <10 seconds. (in case an alliance member wants to come along for the ride)

[lespie]

we are using a hand wench and changing the hand part to the motor and i cant say much more so i cant tell you much more but try a hand wench that has gotten us this far........

good luck

[joek]

a wench, that's pretty creative (and heavy) , we're using a steel-cable boat winch and a scissor lift

[craigboez]

Anybody know if you can get a winch like these locally, like a hardware store or Lowes/Home Depot?

[Ken Leung]

2 CIM motors for our winch... Overkill? Maybe.

[Hastypickle]

All I am saying about ours is that we are using a single CIM directly attached to the drum of a hand winch.

[windell747]

Thanks for the replies everyone! Great advice! So in response to the last reply, is a CIM powerful enough to drive a winch drum directly and lift the robot? I was thinking about a worm and worm gear setup to drive the hand crank shaft on a winch supplied by grainger.

[joek]

Thanks for the replies everyone! Great advice! So in response to the last reply, is a CIM powerful enough to drive a winch drum directly and lift the robot? I was thinking about a worm and worm gear setup to drive the hand crank shaft on a winch supplied by grainger.

not unless you use a gear box with it, we're using one from '07, but a worm gear might work

[Hastypickle]

Originally Posted by joek

not unless you use a gear box with it, we're using one from '07, but a worm gear might work

I forgot to put in that we are using a gearbox. Our tests show that our configuration will work quite well.

[baihooli3022]

hey guys, what Team 3022 did for our winch system. We just basically used the KOP's Window motor, and placed a bearing on the other end of a shaft we fit into the motor. Next, just attach a string, and instant winch made by the KOP motors. We tested it earlier with just our bot's frame (about 40 pounds), and it worked fine. We're about to test it with our robot's near final weight (about 100-120).

[joek]

a window motor is not gonna lift a robot without being geared down a lot

[Dad1279]

Originally Posted by windell747

......So in response to the last reply, is a CIM powerful enough to drive a winch drum directly and lift the robot?.....

If the diameter of the pulley is about 1/48th of an inch. Then it must be made of some really strong stuff.....

Or it winds in a block and tackle with about 48 pulleys.....

I would suggest downloading and learning to use JVN Spreadsheet. http://www.chiefdelphi.com/media/papers/2059

[Grim Tuesday]

Our winch idea (already made now ) is here. Although, it is a bit overkill, since by my calculations, it can lift about 600 lbs... However, it can do it in about 3-4 seconds to get above the platform, and 10 to get to 7 ft. What you see in the model is a 12--->24, then a 1----->60 reduction. All in all, it is a 120---->1 ratio.