NEW ARB Snatch Block

[michaelgroves]

I doubt you'll find a broken or damaged one. I've been running one for a while with no problems and as I understand it the load rating was as high as ARB could produce through either the maximum size steel or synthetic line under an operating actual through the pulley load. In other words, the cable broke in every case before the snatch block began to fail thus they could only rate the block as high as the rope/cable would fail at. That's why there is no minimum destruction rating. It's unknown with current wire rope/plasma capacities.
Marc

I don't really think that's right. The block's rated at 9,000kg, or 18,000kg breaking strain. 13mm Dynex Dux rope has a breaking strain of well over 20,000kg. (For the purposes of determining the ultimate breaking strain of the block, they could also have used oversize rope - an extra 2mm diameter would yield another 5 tons or so!).

 

[michaelgroves]

One neat thing about the composite pulley, it deforms and then "springs" back to shape (has a memory). Take a look at a normal steel pulley that has seen extended use with a wire rope, the pulley surface is often pretty nasty, all added friction. The composite pulley reduces much of that.

Wouldn't most of the nasty surface be due to abrasion, rather than pressure deformities? In which case, I would have thought most composites would be better than an aluminium sheave, but not as good as a steel one. (Obviously, it depends on what the composite is - I would imagine ceramic, for example, would be very good against abrasion, but then wouldn't have the "memory" you referred to, so I'm assuming it's some kind of polywhatsit plastic).

 

[cruiseroutfit]

...so I'm assuming it's some kind of polywhatsit plastic).

Its a crystalline polymer with self-lubricating properties, I want to say it comes from Switzerland or Austria?

 

[Crikeymike]

The t-max used the design of ARB's older steel unit to make their own, as did several other manufacturers.

So what is the minimum turn radius for the thickest wire rope that's used in electric winches? If you Consider the size of the drum that the cable spools onto for the winch, I don't think this can even be a concern for the ARB snatch block since it's no smaller than the drum.

 

[Crikeymike]

I want to say it comes from Switzerland or Austria?

AUSTRIA - well then, G'day mate!!

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