Author Topic: Antikythera Mechanism, work in progress...  (Read 3931 times)

Offline jltrent

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Antikythera Mechanism, work in progress...
« on: March 06, 2011, 04:05:12 PM »
Instead of focusing on the clock I was building earlier, I got sidetracked on another device, although not quite a clock...  (See attached images.)

An attempt at a faithful, twice size replica of the remarkable ancient Greek celestial calculator.  The actual artifact was found off the Mediterranean island of Antikythera c1901 by sponge divers, and is estimated to have been built between 150-100 BC by the Greeks, and incorporated technology that went lost for 15 centuries.

Measurements taken primarily from the x-ray of fragment A by Shaw Inspection Systems (see http://www.shawinspectionsystems.com/library/antikythera/cr/radiograph.htm?radiograph=016), and other information gleened from various published papers (http://www.antikythera-mechanism.gr).  The front of the mechanism will eventually have calendar and sidereal month dials, and the back will have the Metonic and Olympiad dials at the top, and the Saros and Exeligmos dials on the bottom.  Opted not to include the Callippic dial, as it is conjecture.  Also, opted not to include any planetary dials, as again hard evidence appears to be lacking, although certainly the large four (4) spoked wheel served a purpose.

Action of gears is a bit finiky, primarily because of a single arbor that happens to pass through a single plate, but this arbor design is true to the artifact.

Made of commercially available cast acrylic, birch plywood, and K&S brass tubing.  Made use of CNC to cut he gears with the 1/16" cutting bit, in addition to the bushings in the cast acrylic.  Used a tablesaw, though, to size and square the acrylic, in addition to cutting some dados.

Next tasks are to layout the front and back engravings on the acrylic, making use of the 1/16" cutting bit and the 60 degree vector.  Still debating whether to attempt to include the copious amounts of ancient Greek text on the Metonic and Saros dials.  Will have to experiment with the 60 degree vector bit with cast acrylic.

With the weather warming, might not be able to get around to finishing it for a while...

Jon

Offline Joe Redburn

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Re: Antikythera Mechanism, work in progress...
« Reply #1 on: March 07, 2011, 04:24:13 PM »
Thanks for posting the pictures.  I did not know that there was enough information to duplicate the machine.
Keep us posted please.
Regards
Joe

Offline pcstru

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Re: Antikythera Mechanism, work in progress...
« Reply #2 on: March 09, 2011, 08:34:00 AM »

Offline jltrent

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Re: Antikythera Mechanism, work in progress...
« Reply #3 on: March 12, 2011, 07:30:39 PM »

Yes, the lego interpretation of the mechanism is quite impressive.  By the looks of it, it certainly involved a great deal of consideration and effort!