As some of you may be aware I with others are working on testing ropes. We acquired a hydraulic tensile tester a while ago which originally was built to test metal work (crabs / maillons and so on). I am planning on also using it for rope. The observation has been made that it would be better to use a electric pumped system rather than a hand pumped set up as one can gain more consistent movement speeds. So does any one know of an electro-hydraulic power pack or pump with working pressure of at least 200 Bar (3000 PSI) gong cheap (or even free)? We need a power pack running off 230V single phase AC, 12V DC or possibly 24V DC. It does not need to have a high flow rate, 1 to 5 litres per minute is adequate. Ideally double acting with a control valve, but we could use and adapt a simple single acting pump.

Any ideas / suggestions ore even offers would be gratefully received.

self contained pump and motor type arrangements as used on taillifts and recovery winches. Used to be loads on ebay, 12v or 24v. I used a 12v one to drive a muckle great anchor winch on the boat which worked a treat.

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Hi there... Thanks for posting.

Err.. So to what extent would anyone helping expose themselves to the risk of benefiting from your venture? ??. Or worse (obviously), having to justify any advice in front of a judge?

Bob does this as part of the BCAs on going rope testing program & has done so for many years. Any one who uses SRT in the UK has benefited from his work & it's probably saved a few lives along the way.

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The tensile test machine I worked on at Tata Steel used a lead screw arrangement. If you're motorising it that might be worth considering.
Regards Andy

The tensile test machine I worked on at Tata Steel used a lead screw arrangement. If you're motorising it that might be worth considering.
Regards Andy

Must admit, those I have used have been similar, with the drive on top (mobile) and the sensor on the bottom (static) -?

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Err.. So to what extent would anyone helping expose themselves to the risk of benefiting from your venture? ??. Or worse (obviously), having to justify any advice in front of a judge?

Legal action would be taken against the person issuing the advice which was claimed to be faulty, not the supplier of a component of a piece of kit which was used to produce evidence on which the advice was based. I am confident that the responsibility 'linkage' would almost certainly be found to be too distant.

Thanks for the ideas. We are aware of the special tensile tester machines using screw threads but clearly they come at a very high price and thus almost certainly out of our price range.

:smartass: I think that you may be in danger of trying to teach your granny to suck eggs!

:smartass: I think that you may be in danger of trying to teach your granny to suck eggs!

Yup :lol: appears one or two folks here don't know Bob---:lol::lol:

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Depends what you call cheap Bob! flowfit does a few for a couple of hundred quid. For that money personally I wouldnt bother going down the secondhand route, given my experience on drill rigs, jacks, presses etc, all you get is leaks!

I know a local chappie who is reasonably priced for O ring and pipe replacement, also a nephew who is in the hydraulic refurbishment industry, but re-chroming of rams could be costly.
Adaption of a hydraulic jack may be an option, but sensors would need some thought---.

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Have a wade through this lot for starters as some of the scissor/tail lift pumps may be suitable?
Suspect there will also a few double acting cylinders about

http://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2050601.m570.l1313.TR12.TRC2.A0.H0.Xhydraulic+pump.TRS0&_nkw=hydraulic+pump&_sacat=0 

If you want to test ropes with something you've lashed up in your shed, you might as well take several IBC containers to a bridge, hang them by the piece of rope and measure the amount of water you used to snap the rope.

http://british-caving.org.uk/wiki3/lib/exe/fetch.php?media=rope_testing:rope_test_poster_bcra_v4_fuller.pdf  and our CREG papers.

Many thanks for the other suggestions, some certainly give ideas.

I have a dc (24v but will work at lower voltages) ram. It's got about 8 inches travel but is quite powerful. I was going to use it as a log splitter but it isn't powerful enough.

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