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Country Discussion Topics
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Hydraulics ?
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DeadCarp    Posted 06-23-2003 at 20:42:08       [Reply]  [No Email]
Anybody into hydraulics? I'm setting up a small backhoe (garden tractor size) and the plans call for a cylinder-driven lateral swing (slew) - well, for the sake of smoothness and freedom of rotation, i think a hydraulic motor might be better. I'm only going by what i've seen on log trucks etc. Maybe rubber cuchions at the end of the cylinder would help too - don't have any idea of what flow or anything would work or what kind of pump can alternately be used as a motor - so thought i'd throw this out there and thanks ahead of time - any thoughts?


grouch    Posted 06-24-2003 at 19:48:34       [Reply]  [No Email]
My old Ford 4500 has a swing motor or maybe a helical rotator as rhud says. All I know is it's smooth. I can comb the hair on a gnats butt with it. Problem is it's worn and weak as far as side pressure is concerned. It'll swing almost 180 degrees.


rhudson    Posted 06-23-2003 at 21:50:58       [Reply]  [Send Email]
kinda thinking that a motor would be too high in speed and too low in torque. unless you use sprockets and chain to gear it down. some use helical rotators (JD i think) big money. looks like a motor from the outside. many use rack and pinion double cylinder rotators. look like a hoz. mounted tube with a shaft located in center(JCB for one). again big money how about two cylinders mounted beside each other pulling a double roller chain. the chain is wraped around a sprocket that delivers the swing. Think of a "U" with the vertical parts of the "U" being the cylinders and the chain wrapped sprocket being the lower curve of the "U" (ford or case maybe? forget where i've seen that)

with a single cylinder and crank arm, the swing will have to be condiserably less than 180 degrees.

i think i can help you with the calculations if you would like.


DeadCarp    Posted 06-23-2003 at 23:34:44       [Reply]  [No Email]
Okay, for the sake of discussion, could i control the RPM by necking it down & controlling the pipe size? The whole rig will weigh maybe 400 pounds (plus load) so if i used the right sprockets, would something like


rhud    Posted 06-24-2003 at 04:53:23       [Reply]  [Send Email]
Yeah, good company. see the 59 inchlbs\1000psi in the right hand spec column? continous psi on this pump/motor is 2000. so if your boom was 59 inches extended, the side force from a direct coupled motor would be 2 lbs. if you gear it down 4 to one (maybe a 16 tooth sprocket to a 64 tooth sprocket) you would have 8lbs of side force. at some point the large sprocket (the one on the boom) will get too large for your design. take a look at this one http://www.surpluscenter.com/item.asp?UID=2003062401253835&item=9-5908&catname=hydraulic
higher torque or
http://www.surpluscenter.com/item.asp?UID=2003062401253835&item=9-4882&catname=hydraulic

trouble with the rotator is that it only has 100 degrees of swing. (how did you get the blue go to line?)

yes, you can control speed with a flow control.

got to go rake some hay, i'll get back to you tonight.



rhud    Posted 06-24-2003 at 19:38:58       [Reply]  [No Email]
i might be sticking my nose too deep into your project, but that what i do best. anyway i was considering building a mini-back hoe years ago. i was going to basically copy and scale down a ford 555 model. the boom and dipper are very simple tube affairs with scabbed cylinder pivot plates added. you might want to look at a minihoe called termite. their boom design is also simple. ring if you need help.


DeadCarp - microhoe    Posted 06-24-2003 at 20:30:52       [Reply]  [No Email]
I've shopped around for plans a bit - starting out with PFE's MicroHoe and tinkering it up from there. I already added a couple inches to the boom
and will add a couple more to the crowd arm - and maybe swap one of 6 cylinders for a motor. So far we're welding & screwing up subassemblies.


Clod    Posted 06-24-2003 at 05:40:47       [Reply]  [No Email]
Hydro stuff.


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