Design for portable hoist base

Why not do what the safety inspectors do and check it with a test load (in a safe place of course). This does rely on you being able to find a large enough weight to test it with -but water is a known density and you should have plenty of that around.

Regards

Kevin

The 'safe place' bit is the problem, although it's 'portable' there's actually only one spot where it's designed to operate. Trouble is, I can't leave it there for long obstructing the towpath The real test is what happens when I swing the load out over the water, & I don't want to lose the whole thing into the canal :-( It's certainly worth a try, but I'd be happier with some idea beyond instinct as to whether it'll do the job.

Cheers Tim

Dutton Dry-Dock Traditional & Modern canal craft repairs Vintage diesel engine service

Just had a thought about that one, if I built an open topped tank with capacity of 500 Kg of water (+25% minus the tank weight) I could lower it *empty* into the canal, then try to raise it *full* from the canal. There's unlikely to be a sudden dramatic failure that way.

Cheers Tim Dutton Dry-Dock Traditional & Modern canal craft repairs Vintage diesel engine service

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From my youth, I seem to remember the insurance engineers at Dad's place running tests loads at +30% of intended Safe Working Load, but it might be worth checking what the current practice is. He certainly had one machine that was designed for SWL +50%, which was apparently excessive. (30T + 50% !)

Steve

I based the 25% on the CAM website, which says all hoists tested to

Cheers Tim

Dutton Dry-Dock Traditional & Modern canal craft repairs Vintage diesel engine service

Tim

One of the methods used involves water bags hung from the hook at various jib extensions. Bags can be made easily from poly tarpaulins. With water density circa 1000Kg/m3 it is fairly easy to make a range of test weights. Hope this helps.

Ian

In message , Tim Leech writes