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Mine Exploration Forum

Author Wanted Gear of special type
Bob Mehew

Joined: 22/01/2016

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Wanted Gear of special type
Posted: 22/01/2016 21:11:16
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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.



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ebgb

Joined: 07/05/2012
Location: weardale

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Posted: 22/01/2016 21:48:37
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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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mid life crisis? buy an 80 year old wooden trawler!- http://bf494.co.uk
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TwllMawr

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Joined: 28/11/2014
Location: Snowdonia

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Wanted Gear of special type
Posted: 22/01/2016 22:01:51
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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?

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'Nitrate of Ammonium: If not too generously applied these explosives make an excellent manure' IP: 92.17.218.194
Mr.C

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Joined: 23/03/2008
Location: North Staffordshire

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Posted: 22/01/2016 23:22:11
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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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We inhabit an island made of coal, surrounded by a sea full of fish. How can we go wrong.......
IP: 95.145.86.127 Edited: 22/01/2016 23:23:28 by Mr.C
Andy Mears

Joined: 23/12/2012

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Posted: 22/01/2016 23:22:39
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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
IP: 92.21.143.179
exspelio

Joined: 02/05/2012
Location: peak district

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Posted: 22/01/2016 23:56:55
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Andy Mears wrote:

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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Always remember, nature is in charge, get it wrong and it is you who suffers!.
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Bob Mehew

Joined: 22/01/2016

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Posted: 23/01/2016 09:18:27
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TwllMawr wrote:


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.
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The Fresh Prince of Portreath

Joined: 05/08/2015

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Posted: 23/01/2016 09:50:58
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I imagine the reason tools like this are vvvv expensive is that they are made by a scientific instrument company and certified as such, with an approved design.

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. Personally, if I was doing a shed design, it would involve hydraulics, a one way valve and grease gun as a power unit. Once you get the rope stretched, the distance to failure is quite minimal...
IP: 81.140.40.222 Edited: 23/01/2016 09:51:34 by The Fresh Prince of Portreath
rufenig

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Joined: 18/03/2008
Location: Shropshire Hills

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Posted: 23/01/2016 11:34:26
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Smartass I think that you may be in danger of trying to teach your granny to suck eggs! IP: 146.199.27.227
exspelio

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Location: peak district

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Posted: 23/01/2016 11:53:31
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rufenig wrote:

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


Yup Laugh appears one or two folks here don't know Bob---LaughLaugh

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Always remember, nature is in charge, get it wrong and it is you who suffers!.
IP: 86.142.153.124
somersetminer

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Joined: 19/05/2012
Location: Bristol

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Posted: 23/01/2016 12:43:33
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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! IP: 86.26.224.69
exspelio

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Posted: 23/01/2016 13:14:44
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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---.

--

Always remember, nature is in charge, get it wrong and it is you who suffers!.
IP: 86.142.153.124 Edited: 23/01/2016 13:25:29 by exspelio
Morlock

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Posted: 23/01/2016 13:31:15
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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

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Mercifully free of the ravages of intelligence.... IP: 31.48.100.26
The Fresh Prince of Portreath

Joined: 05/08/2015

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Posted: 23/01/2016 15:11:50
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rufenig wrote:

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


With the wording of the title, it read like a chinaman saying herro.
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Bob Mehew

Joined: 22/01/2016

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Posted: 23/01/2016 15:31:31
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The Fresh Prince of Portreath wrote:


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.

Neat idea though one or two practicalities to sort out (like filling the containers with over 1 tonne of water in a sensible time). Sorry I did not make it clear that our unit already has a hand pump, the idea is to move up a bit. Rope behavior is a bit odd, have a look at 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.
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crickleymal

Joined: 12/03/2009
Location: Gloucester

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Posted: 23/01/2016 23:33:49
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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. IP: 86.175.236.143
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