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The #Antikythera Mechanism Episode 4 - Making And Fitting B2 In this video the most recognizable component of the mechanism continues to take shape, and becomes the first moving part within the plates. If you would like to help support the creation of these videos, then head on over to the Clickspring Patreon page: ________________________________________________________ A very special thank you to Patrons: Sinking Valley Woodworks () Glenn Trewitt Christopher Warnock Mike Manfrin Sam Towne Adam Slagle Jack Cause Daniel Taraldsen Jeremiah G. Mort Dave Seff Matteo Neville Olof Haggren Stassinopoulos Thomas Florian Ragwitz Larry Pardi Samuel Irons Tim Bray Sean Kuyper ________________________________________________________ You can also help me make these videos by purchasing via the following Amazon Affiliate links: Cameras used in this video: Panasonic GH5 - Panasonic X920 - Tools & Shop Products: “Solidworks 2013 Bible“: “A Portable Cosmos: Revealing the Antikythera Mechanism, Scientific Wonder of the Ancient World“ Dykem 80300 Steel Blue Layout Fluid, Brush-in-Cap (4oz): Hegner Scroll Saw: Super Pike Saw Blades Size 4/0 pkg of 144: Dormer A190202 Jobber Drill Set, 1.0 mm - 6.0 mm x 0.1 mm Size: Dormer A190203 Jobber Drill Set, 6.0 mm - 10.0 mm x 0.1 mm Size: YG1 NC Spotting Drill 8% Cobalt HSS 1/8 to 1/2“ 120 Degree 5 Pc Set CNC Machine: Blue Matador Abrasive Paper - Abbreviated Transcript: 01:19 Now before I do any more with this wheel, I'd like to show you a bit more detail on where it fits into the mechanism. Its permanently fastened to the main Solar Drive Wheel B1, and its part of the gearing associated with the back half of the device. In fact its the first wheel in that large and quite complex part of the mechanism. 01:37 It engages 2 wheels, that in turn drive the gearing that animates the eclipse prediction display, the calendar display and the lunar phase display. Now that's a lot gears, generating a lot friction. So the load on B2 and its rivets is considerable. 02:04 And secondly, the scans show 4 quite substantial rivets placed in a symmetrical pattern around the spokes, that hold B2 firmly in place. Its a very neat solution that wouldn't be out of place in a modern clock mechanism. Now the central bore of B2 needs to be opened up to match the main bearing and it could be simply drilled out on a drill press. 02:51 And you'll notice that I haven't used any marking fluid to make that circle more visible. I've done this to show just how hard it can be to see even a simple object line on bare metal. Even up close I think you'll agree it's not exactly the clearest line you could hope for. 03:49 One to locate parts on the division plate, and one to bring all 3 components into alignment for drilling out the rivet hole positions. Now it certainly doesn't meet the requirement of robust handling, but a very straight forward marking material worth investigating is candle soot. 05:02 The positions for the 4 holes are now firmly located over the centerline of each of the spokes, and can now be drilled out in preparation for accepting the rivets. And as tempting as it is to just drop in all 4 holes at once, even the slightest movement of the work whilst drilling can lead to an unacceptable misalignment of the holes. 05:44 The 4 rivets were turned to size, and left just long enough to allow them to be comfortably held for insertion. By now of course a lot of the soot has worn off, so I think its clear that it really wouldn't be suitable for marking out anything that needs a lot of handling, like for example the wheels. 06:57 And then started the process of permanently setting them in place. I made sure that each rivet end was thoroughly peened, and that the metal was pushed well out into the chamfer, giving not just a seamless join, but also good solid mechanical strength. And for the final step, I used a file and 800 grit abrasive paper to blend the rivets into the surrounding metal. 08:23 And as I reach the end of this video, its hard to escape the thought that over 2000 years ago, there was moment, just like this. References: Gears From The Greeks - Derek de Solla Price: The CT and PTM data that the AMRP have made publicly available can be found here: Gear schematic can be found in Tony Freeth's 2012 research paper: Credits: Clips from “The 2000 Year Old Computer“ courtesy Images First Ltd. Digital image of the Back Dial of The Antikythera mechanism courtesy Tony Freeth, Images First Ltd The Antikythera Mechanism Episode 4 - Making And Fitting B2
