Recent Posts

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General Discussion / Re: Newbee introduction
« Last post by gorbo on August 28, 2015, 04:02:13 PM »
Hi all

I am from Kidderminster, England
I have had a CNC router for a few years now and was looking for a new way of spending my time and came across Wooden clocks,
I have downloaded some plans from Brian Law (DXF) and rareing to go,

Between Workshop time I will be trolling through these pages and getting good advice

Regards

John
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General Discussion / Re: First-timer seeking advice choosing first clock
« Last post by gorbo on August 28, 2015, 03:57:15 PM »
I too have just been biten by the Wooden clock bug, I own a CNC and have cut test gears with great results

I download the DXF files from Brain Law (no 2 ) , just waitng for a Lathe and I will start, dare say I will be asking for advice soon  :)
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General Discussion / Re: Antikythera Mechanism
« Last post by Mechanism Man on August 22, 2015, 04:05:29 PM »
Thanks Jon,
Yes, for a 2000 year old design it really is quite something. I understand completely what you say about D1/D2 - potential for twisting here is quite high, so although it doesn't look like I'm going to experience the same issue, I shall beef it up a bit, just to be sure.
And as for the nine layers of nested tubing, I too think that this would be the biggest problem that they would have to to have overcome with the original - maybe it was done with separate pointers as Professor Evans' team have suggested? But that's too messy for me, and I have access to nested tubes! I can't wait to get the orrery finished so that I can get back into this - another month and I'll be there.  :-)
Anyhow, here's a photo of all the orrery gearing finished and ready to be fitted - that was a long month... Frames next.

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General Discussion / Re: Antikythera Mechanism
« Last post by jltrent on August 14, 2015, 12:43:29 PM »
Impressive start on the Antikythera Mechanism!  More so in that the gears are handcut!  I was "bit by the Antikythera bug" and attempted a build a few years back (see thread further down in the "General Discussion" section), and was about to pick it back up again a few months back when I noticed that new research had come out from Tony Freeth on the superior planets, involving further sets of epicyclic gearing.  This caused me to pause, so I began to gather supplies, in particular semi-transparent plexiglass for the gearing and the 9 concentric tubes for the planetary and lunar outputs, but other projects and life events got in the way...

On my original model, I found the d1/d2 gear pair to be problematic, as in one direction the gearing up would torsion the arbor causing jamming.  (Interestingly enough, in Derek de Solla Price's diagram, he shows a spring on the d1/d2 arbor, which probably is the compensating mechanism for the torsion...) 

It's still hard to believe that the design of the Antikythera Mechanism existed 2100 years ago, both even more so, that the techniques for building it existed.  I can easily see the design evolving from the ancient mathematical methods of geometry, but how they went about building 9 layers of concentric tubing for the lunar and planetary dial seems to me to be a much greater technical challenge...

In any event, am interested to see how your rendition eventually comes out once you again find time, and to hear some of the challenges you had to overcome...

R, Jon
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I read it, my mind will be applied accordingly.
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Wheels and pinions / Re: Wheel/Gear confusion
« Last post by Umengwabu on August 14, 2015, 04:03:34 AM »
I look for things like this at this time.
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General Discussion / Re: Antikythera Mechanism
« Last post by Mechanism Man on August 13, 2015, 09:47:43 PM »
Hooray! All the hard work is now done - all the gearing is now cut, with the last few spoke holes finished about 10 minutes ago. All that's left is sanding and varnishing to finish them off and then it's time to cut the frames.
The gear cutting is by far and away the longest job, but if you take a bit of time with it and get it right then the rest of the machine goes together so much more easily.
More soon.
:-)

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Other escapements / Re: Retrograde motion
« Last post by Neonizor on August 11, 2015, 04:10:20 AM »
I searched for a long time, but you never know.
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Links / Re: Claude Sauvageau---
« Last post by Neonizor on August 11, 2015, 04:10:03 AM »
I would like to know if you guys know it.
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General Discussion / Re: Antikythera Mechanism
« Last post by Mechanism Man on August 08, 2015, 09:58:44 PM »
Almost there - another couple of hours should see the last few 19 tooth gears cut. Oh yes. :-)
I then have to go back through them and cut all the spokes, and sand them, and apply varnish... Doh...

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