Good question. I intrigued me so I researched it. To make gears the Greek craftsmen made a circular blank, then marked it out for the correct number of teeth, probably using dividers, then filed the teeth with a triangular needle file Analysis of the Antikythera Mechanism shows the sort of irregularities that this method would give, Michael Wright made gears this way to prove it. The teeth have a 60 degree angle and are triangular in profile, which is not very efficient, but good enough for a clock. I made a pair of gears this way, it took half a day but it worked.
Thanks for the link. Tom Harris <celephi...@gmail.com> On 11 May 2015 at 10:32, Hal Murray <hmur...@megapathdsl.net> wrote: > Michael Wright talking about the Antikythera > http://www.the-eg.com/videos/michael-wright-antikythera-resurrector-eg8 > > The video is 1/2 hour. I thought it was good. He's a colorful speaker. > > Anybody know how they made gears back then? Or machinery in general? What > did they use for a file? How did they make files? > > > The Computer History Museum is having an event: > > May 13, 2015 10:30 AM > Secrets of the Antikythera Mechanism > http://www.computerhistory.org/events/upcoming/ > > In 1900, sponge divers off the coast of the tiny Greek island of > Antikythera > made an astonishing discovery: the wreck of an ancient Roman ship lay 200 > feet beneath the water, its dazzling cargo spread out over the ocean floor. > Among the life-size statues and amphorae was an encrusted piece of metal, > which after nearly a century of investigation, is finally revealing its > secrets.... > > > -- > These are my opinions. I hate spam. > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
