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Posted by on February 2, 2006, 8:36 pm
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Some of us over in LUGNET noticed it as well - *very* nice, and a
lot of us are very curious about the details. It needs about a 100
turns?!? Use an RCX as a dumb battery box to motorize it ;-). Someone
on LUGNET also recently posted a working knitting machine. Now we need
the machine inbetween (Jaquard [sp?] loom).
--
Brian Davis
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Posted by Eli the Bearded on February 3, 2006, 4:16 pm
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> Some of us over in LUGNET noticed it as well - *very* nice, and a
> lot of us are very curious about the details. It needs about a 100
> turns?!?
I'm guessing that's becuase lego gears are small and weak. A big
gear for a big crank would probably help a lot.
> Someone on LUGNET also recently posted a working knitting machine.
> Now we need the machine inbetween (Jaquard [sp?] loom).
The one I've seen:
http://homepage.mac.com/aklego/PhotoAlbum22.html
Does spool knitting, which is trivial compared to a regular knitting
machine -- even one without a ribber. Mind you, I'm impressed, but it
is a baby step towards knitting. All you get is a lucet cord.
Elijah
------
can see a Jacquard loom being much more difficult
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Posted by Andy on February 5, 2006, 1:31 am
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>> Some of us over in LUGNET noticed it as well - *very* nice, and a
>> lot of us are very curious about the details. It needs about a 100
>> turns?!?
>
> I'm guessing that's becuase lego gears are small and weak. A big
> gear for a big crank would probably help a lot.
There is a LOT of friction in moving 200 gears, along with the
mechanisms they drag along. There is also a detent which causes each
digit to "click" into place.
The original Babbage design was 1:1. The version of his machine made
by the London Museum was 1:4. Mine is about 1:105
On the other hand, the movement is very smooth and light. Part of the
issue is that I only have a specific set of gear sizes available. I
would have been happy to have 1:80, but I had a choice between too low
or too high and too high simply won't work, so I'm stuck with too low.
--- Andy
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Posted by Jacob Sparre Andersen on January 27, 2006, 8:23 am
Please log in for more thread options Andy Carol writes:
> I just wanted to de-lurk to mention that I've completed construction
> of a working LEGO Difference Engine. (i.e. a Babbage Engine)
It's very impressive. I sent the link to our High Performance
Computing group, so they can see how to make real calculators. :-)
> http://acarol.woz.org
>
> The web page has several detailed pictures, theory of operation, and
> a mechanical description.
I didn't quite understand how it works. I suppose it takes a bit of
experimenting to figure it out. Please let us know, if you expand the
explanation.
Play well,
Jacob
--
City X'ers mail van (building instructions):
http://lego.jacob-sparre.dk/CityXers/Postbil/
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Posted by Mark A. Plum on January 28, 2006, 1:38 am
Please log in for more thread options Andy:
What a fascinating thing this is. I gave a quick study of the device and am
amazed what can be built with Lego. Being a student of mathematics myself,
this is really quite exciting!
Great Work!
Best Regards,
Mark
<Andy Carol> wrote in message
>I just wanted to de-lurk to mention that I've completed construction of a
>working LEGO Difference Engine. (i.e. a Babbage Engine)
>
> It has over 200 gears, 20 shock absorbers, and is about 18 inches tall by
> 25 inches wide. It is purely mechanical in nature, requiring over 100
> turns of the crank for each answer.
>
> http://acarol.woz.org
>
> The web page has several detailed pictures, theory of operation, and a
> mechanical description.
>
> It can evaluate any polynomial of the form ax^2 + bx + c, up to three
> digits.
>
> Enjoy!
>
> ----- Andy
>
>
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> lot of us are very curious about the details. It needs about a 100
> turns?!?