To figure the pull on a snatch block you count the lines going to it and use this number as a multiplying factor. A snatch block does not always double the capacity of a winch. Since many will disagree with that I will say it again. A snatch block does not always double the capacity of a winch. Sometimes a snatch block only changes the direction of pull. The angle between the 2 lines also needs to be figured in the calculation.
Here is a simple calculator. This shows what is needed to move 12,000 lbs of weight. Notice in the left picture you need a 12,000 winch and a 24,000 snatch block just to move 12,000 lbs. But in the second picture from the left you need a 6000 lb winch and 12,000 lb snatch block to move this same 12,000 lbs.
So there are many calculations that go into winches; snatch blocks; and line pull force. But for the lay person if you have a 12,000 winch you need a 24,000 lb WLL single sheve snatch block.
Also be very careful when buying a snatch block. Lots of cheap snatch blocks are sold as "Capacity". 12 ton capacity. Capacity equals breaking strength not WLL working load limit. You need a snatch block with a 24,000 lb or 12 ton WLL not a 12 ton capacity.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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