RNeumann
Elite Member
You can have even number mechanical advantage.
Sheave block mechanical advantage?
- Thread starter Billy Bee
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You can have even number mechanical advantage.
Spanner
Veteran Member
You can indeed.
And there are several other errors in earlier posts in this thread.
The following article may help explain:
Pulley | encyclopedia article by TheFreeDictionary
And there are several other errors in earlier posts in this thread.
The following article may help explain:
Pulley | encyclopedia article by TheFreeDictionary
Brad_Blazer
Veteran Member
If you pull with some tension T and have some number of strands N at the same tension leading to the object you want to move, the total pulling force is T multiplied by N. (neglecting friction)
RNeumann
Elite Member
And angle/distance between winch and anchor
turnkey4099
Elite Member
yep. I commonly use 2x1 and 4x1. from anchor to pulley on load. 2nd line is from anchor through pulley attached to the free end of line coming from the pulley on load and back to the winch.
I've moved some huge logs using just my 1/2 ton F150 2x...actually a 1x as the positrac doesn't work. Drawback with 4x1 is you have to pull 40 ft of cable to more the load 10 feet.
Egon
Epic Contributor
Ahh - look up pulleys & mechanical advatage. Basically the distance the load moves compared to the distance the puller moves will tell the tale.
Take some time to look over the entire operation. How much persuading on the direction of fall are you going for? Keep in mind that there can be a massive amount of energy stored in a tree. If it starts going the wrong way you may not be able to stop it. Check you tube for idiots with chainsaws to get some great pointers on what NOT to do. Be careful out there.
Doug in SW IA
Doug in SW IA
OP
Billy Bee
Silver Member
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- Jan 25, 2014
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- Location
- Lowell Michigan
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- New Holland TC 33, John Deere 3020
The trees are dead ash about 10 in. at the base, and maybe 30 ft. tall. They are close to the road and I don't want to fell them in the road. I am going to fell them parallel to the road. I could probably do it with no "persuasion" , but I want to be sure. I have used my sheave block many times on trees much larger than these. I understand the dynamics of the energy stored in a tree, I would never try to force a tree to go where it flat won't go. I wear chaps,forestry helmet,ear and eye protection,steel toed boots, and always make sure I have a clear escape route. Yes I have seen the videos, the idiots and also the informative how to videos from Stihl and Husqvarna. I try to be as safe as I can, for myself and bystanders. I have great respect for trees, even after they are down they can hurt you. I will be careful.
Thanks for your concern,
Bill
LD1
Epic Contributor
Its already been covered, but keeping it simple.....
With a single pulley.....with the pulley anchored solid and not intended to move......nothing more than a change of direction
With the pulley attached to what you are wanting to move, and thus the pulley moves....2:1 advantage in force....half speed
With a single pulley.....with the pulley anchored solid and not intended to move......nothing more than a change of direction
With the pulley attached to what you are wanting to move, and thus the pulley moves....2:1 advantage in force....half speed