Subject:
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Re: Prototype Pneumtic Excavator Controls
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Newsgroups:
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lugnet.technic
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Date:
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Tue, 23 Jul 2002 00:56:57 GMT
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Viewed:
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551 times
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In lugnet.technic, Steven Lane writes:
> I've come up with a prototype design for a for a pair of control levers that
> can operate the 4 major digging functions of a Hydraulic excavator without
> the operator having to take their hands off them to reach another control.
>
> http://www.brickshelf.com/cgi-bin/gallery.cgi?i=211698
> http://www.brickshelf.com/cgi-bin/gallery.cgi?i=211699
>
> The idea was to design a system that replicates much more closely the
> controls used in the real world. By using two axis controls you can operate
> all functions simultaneously if needed. The fist switch has two pnuematic
> function's, so that could be set to control the two arm function's, the
> other has one valve and one electric switch, so that could be used for
> bucket control and slewing the body of the digger.
That's an excellent idea, Steve.
> The system would be ideal for models like those of T.J and Jennifer who both
> have pneumatic excavators, although the extra performance might be wasted on
> T.J's machine as he's admitted it's a little slow.
Jennifer and I got together at the 'fest and improved the performance of the
R996 greatly. She hooked up one of her compressors to my excavator and it
worked great. That tells me that my first serious modification should be to
add another compressor, or two, or three. Or just go all-out and add
something like Doug Carlson's octopump (which I saw at the 'fest- it's awesome).
http://www.visi.com/~dc/comp/index.htm
> Why do you have so many valve's on your controller T.J?
Because I have 14 cylinders :-)
Really, I don't know how real excavators are controlled. The digging arm on
the R996 model is articulated in 3 parts, and the shovel clam is hinged as
well. That's why there are 4 valves. The 5th valve is a release to discharge
the system.
However, your controller shows me one needed modification: lengthening of my
valve handles. When operating it, I find it difficult to slowly and
carefully operate the valves with such short handles. If you let the
cylinders go too quickly, the digging arm will smack down on the table![1]
TJ
[1] Which is an excellent move when your opponent[2] is smaller and is under
you.
[2] Jennifer's skid-steered loader (Bobcat). BTW, she won. She did the most
damage and actually pushed my R996 around the table!
> All it needs now is a pair of foot pedals for controlling the tracks and an
> excavator to connect it to, but that'll take a bit more time :-).
>
> Steve
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Message has 2 Replies:
 | | Re: Prototype Pneumtic Excavator Controls
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| (...) I dunno, Jennifer and that bobcat. She took me on, over a year ago with it. Her bobcat versus my Cat D11 (since cannibalized but I have the chassis still). We we're both prepared to sacrifice the surface of Tony Priestman's (chesirefest (...) (22 years ago, 23-Jul-02, to lugnet.technic)
| | | Re: Prototype Pneumtic Excavator Controls
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| (...) I've just had another look at your controller, it looks as though it's covered in valves but actually four of them are really electrical switches that only look like valves, you've put the same handles on everything. A closer look reveals the (...) (22 years ago, 23-Jul-02, to lugnet.technic)
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Message is in Reply To:
| | Prototype Pneumtic Excavator Controls
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| I've come up with a prototype design for a for a pair of control levers that can operate the 4 major digging functions of a Hydraulic excavator without the operator having to take their hands off them to reach another control. (URL) idea was to (...) (22 years ago, 19-Jul-02, to lugnet.technic)
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