Re: lift winch ideas anyone?
 

We are considering meshing two fisher price motors and gear boxes. we used a similar design in 2007 and it worked well for us. a positive is that they are lightweight and still provide all of the power and speed you would need in a winch. Hope it helps.

Re: lift winch ideas anyone?
 

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
:ahh: :yikes:

Re: lift winch ideas anyone?
 

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

Re: lift winch ideas anyone?
 

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

Re: lift winch ideas anyone?
 

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

Re: lift winch ideas anyone?
 

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

Re: lift winch ideas anyone?
 

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.

Re: lift winch ideas anyone?
 

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

Re: lift winch ideas anyone?
 

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

Re: lift winch ideas anyone?
 

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

Re: lift winch ideas anyone?
 

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).

Re: lift winch ideas anyone?
 

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

Re: lift winch ideas anyone?
 

Joe,

OK. Let's see if the math supports your statement...

The previous poster stated that he connected a shaft directly to the window motor. The most likely would be a 3/8" diameter...

The spec sheet for the Nippon-Denso gives a stall torque of 10.6 N*m. Now, the maximum power for a DC motor will occur at 1/2 speed and this give a torque of 5.3 N*m or 3.9 ft*lb or 46.9 in*lb.

The radius of the shaft is 3/16" which gives us a lifting force of (16*46.9)/3 = 250 pounds...

Cool!

I will leave it as an exercise for the student to calculate the speed of the lift and as an exercise for the testers to determine if the internal PTC resistor will interfere with lifting operations...

Regards,

Mike

Re: lift winch ideas anyone?
 

Can we use more than 4 CIMs? I forget what the rule is.

Thanks![/quote]

this year you are allowed to use up to five CIMs... We are using a 32:1 BaneBot Transmission with a CIM powering it, and it is hooked up to a custom winch system that we built... the one thing that you have to worry about is if you are using any type of airplane cord or such(anything besides an arm) than you will have to make some type of guide to stabilize the robot while you are grappling up.

Re: lift winch ideas anyone?
 

Our winch idea (already made now :P) 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.