Decent Deal on ARB Snatch Block

[Antichrist]

http://www.oconeeoffroad.com/servlet/the-4149/ARB-Snatch-Block/Detail
Free shipping today.
I've never bought from them so can't offer any opinions. I just came across the site.

 

[AlexJet]

They have regular snatch block.

I need this one. The website you linked doesn't have it. I'd jump on the deal if somebody knows a good deal on this.

 

[BikinCO]

I've never bought from them so can... I would not hesitate to buy from them again.

 

[ryguy]

They have regular snatch block.

I need this one. The website you linked doesn't have it. I'd jump on the deal if somebody knows a good deal on this.

As much as it pains me to promote this company, because they're a division of transamerican wholesalers(4wheelparts.com), they had the best price I found when I was hunting for one
http://www.winchdepot.com/Winches-W...&t_s=124&t_pt=5520&t_pl=8392&t_pn=ARB10100020

 

[Willman]

They have regular snatch block.

I need this one. The website you linked doesn't have it. I'd jump on the deal if somebody knows a good deal on this.

We have them instock and ready to ship!

Linky

Both ARB blocks are great! I sure my Warn recovery bag alot! It has been a great tool when times get bad!

 

[Youngunner]

4wheelparts was having a 10% off sale and i picked up a few ARB recovery items including that snatch block.

 

[michaelgroves]

I presume the rating of snatch blocks (e.g. 30,000lb breaking strength for the standard ARB snatch block) refers to the double-line pull? (For a 180deg pull, the sheave will be under about twice the load the winch is exerting). So that's not much of a margin for a 12,000lb winch, and no margin for a 15K! What should one use for these bigger winches, since they reach or get close to the breaking strength of the standard ARB block, and both exceed the working load limit of the more expensive ARB block?

 

[alexrex20]

Warn makes some big MFers. if you were really worried about weight ratings, you could use a marine or industrial application pulley block.

 

[skysix]

I presume the rating of snatch blocks (e.g. 30,000lb breaking strength for the standard ARB snatch block) refers to the double-line pull? (For a 180deg pull, the sheave will be under about twice the load the winch is exerting). So that's not much of a margin for a 12,000lb winch, and no margin for a 15K! What should one use for these bigger winches, since they reach or get close to the breaking strength of the standard ARB block, and both exceed the working load limit of the more expensive ARB block?

Remember that a 12000# winch is only delivering it's maximum pull when the first wrap is being wound onto the drum - more wraps = less pull. Also the rating (IIRC) is based on a 12000# vehicle rolling freely up a 30degree incline (pulled by the winch) and is NOT a 12000# pulling force on the cable

 

[Antichrist]

Remember that a 12000# winch is only delivering it's maximum pull when the first wrap is being wound onto the drum - more wraps = less pull. Also the rating (IIRC) is based on a 12000# vehicle rolling freely up a 30degree incline (pulled by the winch) and is NOT a 12000# pulling force on the cable

You're certainly correct on the first part, but I've never heard that the winch ratings were based on pulling a vehicle of a given weight up a 30% incline. If that were the case, winch manufactures would be suggesting something like a 3,000lb (or less) capacity winch for any of my Land Rovers, rather than "a winch with a rated line pull at least 25% greater" than the GVW.

Luckily my largest winch is only a 10k.

 

[skysix]

Will try to find out where I read that - was years ago (70's) when I was researching wormgear driven winches (they can be used to lift a load since when power off they self lock - unlike the much more common planetary types...). Haven't seen a Hickey Sidewinder in a LOOONG while....

 

[michaelgroves]

Most full-size vehicle recover winches quote a proper line pull rating, which is the maximum nominal pull on the cable on the first layer. I say nominal, because on an electric winch it is impossible to estimate the torque spike at the moment of stall-out. So the rating is the maximum load that the winch can move, but it can actually exert considerably more instantaneous force on the cable.

I have never heard of a snatch block breaking, but it does worry me that the quoted breaking strain is so close to the winch's nominal pulling capacity! Even the heavier duty of the two ARB blocks seems to be only suited to a 9000lb winch or smaller.

 

[skysix]

Winch Tests (dyno limits vs manufacturers ratings)

From the UK - old test but noteworthy is that most failed at far less than the rated load (load measured in-line with a dynamometer) For example a Warn XD9000i rated at 9000# failed with an actual line load of ~2100#, a Warn 8274 (8000#) failed at ~4540# and a Superwinch G10 (10,000#) failed at ~4620#

http://parts.grade.de/bergen/milemarker/weston.htm

Leads one to think that the numbers are as much marketing as anything... There are valid and repeatable test procedures used for winches and hoists in other areas of use. I believe Overland Journal also did a good test on 'recovery' winches last winter but I can't find out what the methodology was...

Most "tests" available out there on line are done with a vehicle that weighs "x" pounds with an unknown rolling resistance on a slope with unknown angle and DO NOT actually measure the tension on the line - but rely on the manufacturers specs and the current draw which (occasionally) they measure as a form of verification.

There are testing methods from DIN and BSI (and likely US-MIL) but I can't find any ASME or ASTM test methods - or at least none for free on-line.

Any engineers with tech library access out there???

 

[Antichrist]

One thing that really stands out in that test is the amount of volt drop they had. It is a huge drop for a motor and will significantly reduce the power of the winch.
Unfortunately there's no way to know why, since they don't say what battery they had, wire gauge from the battery to the winch and other things that will affect it.

The Overland Journal winch test results lead me to believe the linked test had some serious methodology flaws.

 

[michaelgroves]

The Overland Journal winch test results lead me to believe the linked test had some serious methodology flaws.

I agree. This test was the subject of quite a bit of controversy here in the UK. I believe it was commissioned by the UK distributors of Milemarker hydraulic winches, and was set up to illustrate why, for any long pulls, a hydraulic winch is so much better than an electric.

IIRC, the agents for Warn and Superwinch didn't get involved directly, and the Milemarker agents did, so there have been many cries of "foul" about the test. In any case, the objective wasn't to see which winch pulled hardest, it was to see which winch could pull a reasonably heavy load over a long distance (this despite the notes I read in the report, which indicated the test was designed to see what loads the winches could exert). That already raises the question of what size battery would be considered fair, in the case of the electrics.

With an inadequate battery, not only would the electric winches start running short of pulling power, but the voltage drop would make them overheat more quickly than they would with a consistent voltage. (I suppose, however, that it's not an entirely unrealistic scenario - electric winches do tendd to overheat on long, continuous heavy pulls).

It seems to me, that stock winches supplied and set up by the distributors, in accordance with their own recommended standard procedures, could easily be tested against each other. Several factors could be measured - for example, ultimate stall-out load, actual line-speed under various loads, effective work done during 1 active duty cycle, effective work done during measured 5, 10, 20, 60 minute periods, etc.)