Subject:
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Re: Lego pneumatic systems overview?
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Newsgroups:
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lugnet.technic
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Date:
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Thu, 25 Sep 2003 19:01:49 GMT
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Viewed:
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1897 times
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In lugnet.technic, Brian Reynolds wrote:
> Kevin L. Clague wrote:
>
> > I don't know what the maximum allowable pressure is, but 30 PSI is probably a
> > good upper bound.
> >
> > It depends on which direction you are trying to move the weight...
>
> What I'm currently thinking about is a mechanisim that will move an arm
> that's hinged at one end through a near 180 degree arc before it comes
> to a rest and then to have the reverse switch pull the arm back to it's
> initial position. At one end of the arm will be a fairly sizeable
> weight of bricks and plates. So my current musing is how to make the
> relatively short reach of the extended cylinder move the whole assembly
> through that range of motion and then to build the arm base structure
> and focal point strong enough that the whole thing doesn't come apart
> under the lopsided weight change.
Near 180 degrees maybe tough. You'll need to keep the piston attached as close
as possible to the pivot point of the arm to get the maximum range.
<snip>
>
> > I don't know if you consider my stuff beautiful, but I have made a lot of
> > interesting things using pneumatics:
>
> Well, by "beauty" I mean that the focus of the model is an appreciation
> of the aesthetic surface design and not the visible mechanical ingenuity
> that makes everything work. I think a better term for the works you just
> pointed to would be a hushed uttering of "technical marvel". That's
> REALLY impressive work and my mind bends trying to follow all the
> construction gymnastics required to keep all that motion balanced and
> focused. That inchworm mpg file is downright creepy with the
> bio-mechanical wave-like motion! I'll assume that you must have had a
> motor running a constant pressure-pump generator in order to get all
> those cylinders working simultaneously?
Thanks for the positive feedback.
I have three large pumps all attached to the same air supply hose, and I pump
all three simultaneously by hand. I've yet to make a compressor that can really
drive the inchworm.
>
>
> > Before you buy more pneumatics off bricklink, I'd recommend you consider buying
> > the 8455 Back-Hoe. It has 10 large pistons, 2 large pumps, 7 switches,
> > pneumatic T's, and hose.
> >
> > http://shop.lego.com/product.asp?prod_id=8455
>
> Now that's something I didn't think of! One of the Lugola members even
> had a copy of this model at our meeting earlier this month (which
> provided the first inspiration for working with pneumatics in the first
> place) but I didn't stop to think just how many pumps and cylinders were
> contained within the model. Certainly for the price that those things
> are selling for on Bricklink a quick acquisition of this much pneumatic
> tools in one set is nothing to sneeze at. Thanks for bringing that up!
Welcome. I bought four, but I'm building up inventory for a pneumatic computer.
>
> > If you have any questions, feel free to ask. I'm quite intersted in pneumatic
> > designs, especially other people's work.
>
> Will do, though my own ambitions fall quite a bit shorter than the
> amazingly intricate works you've assembled. I'll do my best to make
> something worthy of inspiration!
Cool!
>
> -Brian Reynolds
Kevin
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Message has 1 Reply:
 | | Re: Lego pneumatic systems overview?
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| (...) The four bar linkages used for driving excavator buckets are good for doing appoximately 180 degrees motion, especially when you have to go "round a corner". The following shows an example - I'm not sure about its angular range but certainly (...) (21 years ago, 25-Sep-03, to lugnet.technic)
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Message is in Reply To:
| | Re: Lego pneumatic systems overview?
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| (...) What I'm currently thinking about is a mechanisim that will move an arm that's hinged at one end through a near 180 degree arc before it comes to a rest and then to have the reverse switch pull the arm back to it's initial position. At one end (...) (21 years ago, 25-Sep-03, to lugnet.technic)
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