Subject:
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Re: JCB JS220 Excavator
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Newsgroups:
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lugnet.technic
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Date:
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Wed, 26 Nov 2003 10:10:28 GMT
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Viewed:
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4291 times
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In lugnet.technic, Jennifer Clark wrote:
> In lugnet.technic, Steven Lane wrote:
> > I watched Jen's digging vid and I think all she needs is a bit more
> > practice.
>
> You want to watch that mouth of yours pal :-) Seriously though, it was indeed
> not my best digger performance. Conditions were not ideal on the beach and I was
> trying to stay out of camera shot and keep the filming concise etc. In addition
> to this....
>
> > I think when digging you should dig with the elbow and use the bucket's crowd
> > feature last.
>
> Indeed so, scraping the dirt along with the dipper is the right thing to do,
> then curling the bucket to scoop before lifting it out with the boom. The
> trouble was that the dipper on the model did not have enough breakout force to
> initially shift the sand, but the bucket did, so I had to jiggle the bucket
> about a bit to either loosen up the sand and/or get the ideal leverage point for
> the dipper, and then the dipper could be moved.
I recind my comment about you needing practice :-),wet sand is the worst type.
>
> The fact that it dug damp sand at all was enough for me; I had half expected
> that it would not be able to.
>
>
> > My prediction for the future is maybe using different source's of air for
> > different functions. Jen's bucket crowds very quickly because it's powered at
> > the same pressure as that used to raise the 4 rams of the arm. If you had a
> > second supply at quarter pressure the two functions would be more proportional
> > to each other.
>
> Yes, I had thought about doing something similar for this model but for a
> different reason. With independent pumps for each function then all functions
> could be performed simultaneously rather than the air flowing down the easiest
> route. I based this on the real JS220 which has 2 hydraulic circuits for the
> boom functions. These can be combined into one for extra force, this could be
> quite a smart addition to a lego excavator too.
Thats an even better idea I might borrow (blatantly steal :-) it!
Steve
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Message is in Reply To:
 | | Re: JCB JS220 Excavator
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| (...) I'd agree with this, it is possible to control the pneumatic valves so that more or less air gets through them. Rather than the problem with pneumatics being of digital in nature, to my mind the biggest problem is their elastic or springy (...) (20 years ago, 25-Nov-03, to lugnet.technic)
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