MadModder
Gallery, Projects and General => How do I?? => Topic started by: PK on June 04, 2016, 01:28:42 AM
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OK, so it only took me two weeks longer than I thought it would to get the project to this stage. But we're here at last..
I've built a little hydraulic press for home.
Of note, I used one of these little units for the muscle: http://www.ebay.com.au/itm/331810274325?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
It has 600mm of stroke, an air motor on the back and is good for 8t. I invite you to convert the price (which includes shipping) to your local currency. It's an absolute bargain!
So I have all the heavy bits fabricated and working. Now I'm moving to the controls. What I want is a lever control for raise and lower.
The lever bit is easy, I have a 5/3 way lever valve.
The press bit is easy, just use said valve to supply air to the motor (might have to be via a pilot operated valve, this thing uses a bit of air).
It's the release bit that has me scratching my head. I could use a rotary actuator. But the mounting brackets would be a bit of a pain in the arse because the little drain valve is at an angle .I'd prefer to use a ram and control horn, but the same applies. I'd really rather not strip the thing and add a separate valve...
Anyone got any suggestions?
PK
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Hi there PK ,thats a mighty fine lookin press :thumbup: nice job :clap: :clap:
As to your release problem it all depends on how far you want to hack the cylinder /pump unit .
I came up with this solution , minimal :proj: required
(http://i1066.photobucket.com/albums/u410/RobWilson100/P1110616_zpsm8zqm1v1.jpg) (http://s1066.photobucket.com/user/RobWilson100/media/P1110616_zpsm8zqm1v1.jpg.html)
Replacing the bleed down screw with a machined up fitting that matched the screw nose angle ,drilled through and the other end machined to what ever flavoured hydraulic fitting you prefer , BSP, JIC etc.
Then pipped back into the oil fill hole further up the cylinder .
Hope photo is clear , I am suffering from one all mighty hangover this morning . :Doh:
Rob
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If I've understood this correctly the screw just releases the fluid internally to let the jack come down.
How far does it need turning - if it's less than half a turn could you use a lever and air cylinder?
Or to simplify mounting how about a flexible coupling to your rotary actuator - or even just an adaptor sliding over the pins sticking out of the screw.
Russell
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I came up with this solution , minimal :proj: required
I like it. It's fairly simple and, as you say, it really just one part.. I'll put that up on the top of the list for now..
Hope photo is clear , I am suffering from one all mighty hangover this morning . :Doh:
:-) That'll teach you to stop drinking!
PK
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If I've understood this correctly the screw just releases the fluid internally to let the jack come down.
Yep.
How far does it need turning - if it's less than half a turn could you use a lever and air cylinder?
Half a turn does it. The problem, as I see it is that it doesn't rotate on a convenient plane. When I add a few hundred mm of ram to the picture, bits and brackets are hanging out in inconvenient places..
Or to simplify mounting how about a flexible coupling to your rotary actuator - or even just an adaptor sliding over the pins sticking out of the screw.
Yeah, I thought about a universal joint.. Might be the go...