Author Topic: Winch and cable question  (Read 1634 times)

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Offline Windpower

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Winch and cable question
« on: November 23, 2014, 01:40:43 PM »

One of my new projects will be to make a boom truck out of the old Toyota PU for getting firewood and other stuff

So I have a 12000 pound Horror Freight winch with 3/8" diameter cable (at least the is what the box says)

I am looking for a snatch block for the end of the boom like this one



My question is: should the sheave radius (the 'groove' in outside of the sheave)match the cable exactly or could a '1/2" radius sheave be OK for 3/8" diameter cable ?



 
Often, our ignorance is not as great as our reluctance to act on what we know.

Offline Don_P

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Re: Winch and cable question
« Reply #1 on: November 23, 2014, 03:14:26 PM »
It's worked fine for me.

Offline MountainDon

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Re: Winch and cable question
« Reply #2 on: November 23, 2014, 04:10:44 PM »
Way back in time I took a class in winching; sponsored by Warn. I don't remember the percentage for certain but they told us the pulley groove should be larger than the diameter of the cable. Maybe by as much as 50%?  Straining my memory on that.  Also for better cable life the pulley should be large as possible. My winching pulley block has a wheel about 4 inches in diameter; rated to 20K lbs, IIRC.
Just because something has been done and has not failed, doesn’t mean it is good design.

Offline UK4X4

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Re: Winch and cable question
« Reply #3 on: November 24, 2014, 12:01:54 AM »
Radius of the pulley channel- wider is fine

Diameter of the pully- larger is better, wire rope does not like small diameters.

If its designed for 1/2" and your running 3/8" it should be fine.

Only concern is the gap between the pully wheel and the side plates, insure its a close tolarance fit

I run one of these on my truck, its a nylon pulley wheel as I run a synthetic winch cable.

The sides pivot allowing easy cable access and then just use a D shackle, never liked hooks on my winch gear, but for your aplication it would probably be fine

http://www.amazon.com/BILLET4X4-SNATCH-BLOCK-9000-ARB/dp/B006YG8M4U

Offline Windpower

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Re: Winch and cable question
« Reply #4 on: November 24, 2014, 04:06:55 AM »
Thanks everyone

I thought it should match, but the 3/8 grooved sheaves were on the small side and not rated at a very high WLL

bigger is better it seems



 
Often, our ignorance is not as great as our reluctance to act on what we know.

 

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