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Using a bigger DIAMETER sheave is ok, but what he is asking about is the size of the groove in the perimeter that the cable sits in. You do not want to use a groove that is too big, or the cable will flatten and become damaged. So he's asking how much bigger of a groove you can get away with.I recall, from reading rigging manuals, the ratio between the cable size and diameter of the sheave is 12:1. 1/2" cable requires as 6" sheave, 5/8" cable a 8" shave and so on. Using a bigger sheave than the indicated size is OK, too small and the cable will breakout the sides of the sheave and make it unserviceable.
Let me clear up some misinformation here. I don't know FMTV winches other than what's been posted here, but I collect block and tackle, civilian and military. I know blocks and rigging very well.So I called Skookum and asked them about the snatch blocks.
They said that they only made the 9/16 and 5/8 size snatch blocks for the army.
So, my interpretation is that either these trucks used a different brand snatch block for these trucks, or they were using a larger pulley than the cable size.
I asked if using a 1/2 cable in a 9/16 block was ok, and they said for this type of application, I could run it, but it is not ideally sized.
Does anyone know specifically which snatch block they issued for these trucks?
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The warn is the black one in the picture and does not have a tag pictured. The warn 36k in either version of snatch block is 1/2" cable by spec with a 3/4" sleeveIt just says Wire Rope 3/4", so how did you go about determining that it is for 1/2"?
The black Warn block is rated by Warn for winches up to 18k. The 18k winches use 1/2" wire rope. I physically measured the groove at the leading shoulders to come up with the 3/4" groove since I don't see where Warn lists groove size. The groove tapers in towards the bottom to create the fit for 1/2" wire rope. You have to have a slightly open tolerance at the top of the groove to make sure the wire rope is guided smoothly to the bottom.It just says Wire Rope 3/4", so how did you go about determining that it is for 1/2"?
Link got chewed up by the forums, let's see if this works: http://www.gunnebojohnson.com/wp-content/uploads/Rigging-Combined1.pdf
I found a deal on the 9/16” Skookum snatch blocks that look like the one in [mention]Awesomeness [/mention] picture. So, I think I am set based on everyone’s feed back. I don’t have the safety latch for the hook..... anyone know where to get them?
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