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[Stephaine Zitzow]

The clock in my son's bedroom constantly lost time. Even with a fresh battery, it would run almost 10 minutes slow just a week after the battery was replaced. And while initially I thought this might be an ingenious trap by an 8-year old to get a few extra minutes of playing before bedtime, he seemed as surprised as me by the clock always being just a bit off.

Using a file (or other abrasive surface), gently rub the buildup away. If there is any remaining buildup that cannot be removed with the file, gently wipe it away with a damp rag. Make sure to let the leads fully dry before putting the battery back into the clock.

To maintain your clock mechanism to avoid this problem, gently remove the hands as shown in the pictures above. Begin by removing the pin or threaded cap that holds the hands onto the axle. Next, carefully pull each hand off. If you plan to take the entire mechanism out, you will need to unscrew the small nut that holds the mechanism tightly to the clock face as well.

So to put my own mind at ease I decided to carve a jig that can be used to ensure I get everything aligned. I started with my circle for the outside of the clock and then the square at the center to fit the mechanism. I also included a keyhole for hanging. Then I worked from those to build my jig. I did a 0.001 offset to the outside of my main circle and then made that into a pocket where I left a post in the center that was exactly the size of the hole for the clock mechanism post and a post exactly the size of the keyhole hole.
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Once the jig was carved I could focus on actually carving a clock. I started with hold downs to bolt the board to my threaded inserts in my waste board. The are sunk into the surface of the board which gives me the ability to surface the whole thing without worrying about my work holding. After carving the bolt holes I take the clamps off and mount the board using my hold down holes I made. Then I surface it.

This is where I diverged from my original plan now. Since starting planning for this I decided to purchase a laser engraver to make jobs like this easier. So now instead of using my jig with the Shapeoko to carve the front of the clock, I decided to use the same jig to orient the clock for laser engraving. I figured out where center on the laser engraver is and placed the jig centered and square according to the grid I engraved with the laser engraver.

I still used Carbide Create to create the clock face by using the circular array tool to layout my minute and hour markings. I made a small rectangle and placed it at the top of the clock and used the array tool to make 12 of them around the circle and then did the same thing with a smaller rectangle to make 60 of them around the circle. The lines in the circle are for making it easy to find the center of the circle for the array tool. I then inserted the text and rotated each one by 30 degree increments to have them oriented properly for the clock.

This is where I exported from Carbide Create and imported into Lightburn for the engraving. I added text to personalize the clock for the retirement and set the engraver to fill the objects.
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I am hesitant to include a picture of the final product since it includes personal information but I have made another more generic one for photos that is just finished carving.
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Time to apply the poly, and install the mechanism. Really happy with how this project came out.

Proof reading can be very hard on your own work. Always double check especially names. For instance Deborah Debra. Nothing worse than mispelling a personalized piece. In your case a spell check would not catch a missing s.

To calibrate clock usually minute hands are slip and hour geared. Turn hour hand to 12 with back gear and move minute hand to 12 (slip). Then use setting gear on back turn full 12 hours to check clock is calibrated.

Now that it has been pointed out to me and I have read many theories I do like this one as well. The symmetry by using the IIII style is nice. It still feels wrong due to the fact that I always learned IV is the correct way to write it though. I will have to offer both options in the future.

The Antikythera mechanism (/ˌntɪkɪˈθɪərə/ AN-tik-ih-THEER-ə, .mw-parser-output .IPA-label-smallfont-size:85%.mw-parser-output .references .IPA-label-small,.mw-parser-output .infobox .IPA-label-small,.mw-parser-output .navbox .IPA-label-smallfont-size:100%US also /ˌntaɪkɪˈ-/ AN-ty-kih-)[1][2] is an Ancient Greek hand-powered orrery (model of the Solar System), described as the oldest known example of an analogue computer[3][4][5] used to predict astronomical positions and eclipses decades in advance.[6][7][8] It could also be used to track the four-year cycle of athletic games similar to an Olympiad, the cycle of the ancient Olympic Games.[9][10][11]

This artefact was among wreckage retrieved from a shipwreck off the coast of the Greek island Antikythera in 1901.[12][13] In 1902, it was identified by archaeologist Valerios Stais[14] as containing a gear. The device, housed in the remains of a wooden-framed case of (uncertain) overall size 34 cm 18 cm 9 cm (13.4 in 7.1 in 3.5 in),[15][16] was found as one lump, later separated into three main fragments which are now divided into 82 separate fragments after conservation efforts. Four of these fragments contain gears, while inscriptions are found on many others.[15][16] The largest gear is about 13 cm (5 in) in diameter and originally had 223 teeth.[17] All these fragments of the mechanism are kept at the National Archaeological Museum, Athens, along with reconstructions and replicas,[18][19] to demonstrate how it may have looked and worked.[20]

In 2005, a team from Cardiff University used computer x-ray tomography and high resolution scanning to image inside fragments of the crust-encased mechanism and read the faintest inscriptions that once covered the outer casing. This suggests it had 37 meshing bronze gears enabling it to follow the movements of the Moon and the Sun through the zodiac, to predict eclipses and to model the irregular orbit of the Moon, where the Moon's velocity is higher in its perigee than in its apogee. This motion was studied in the 2nd century BC by astronomer Hipparchus of Rhodes, and he may have been consulted in the machine's construction.[21] There is speculation that a portion of the mechanism is missing and it calculated the positions of the five classical planets. The inscriptions were further deciphered in 2016, revealing numbers connected with the synodic cycles of Venus and Saturn.[22][23]

All of the items retrieved from the wreckage were transferred to the National Museum of Archaeology in Athens for storage and analysis. The mechanism appeared to be a lump of corroded bronze and wood; it went unnoticed for two years, while museum staff worked on piecing together more obvious treasures, such as the statues.[31] Upon removal from seawater, the mechanism was not treated, resulting in deformational changes.[34]

On 17 May 1902, archaeologist Valerios Stais found one of the pieces of rock had a gear wheel embedded in it. He initially believed that it was an astronomical clock, but most scholars considered the device to be prochronistic, too complex to have been constructed during the same period as the other pieces that had been discovered.

Investigations into the object lapsed until British science historian and Yale University professor Derek J. de Solla Price became interested in 1951.[37][38] In 1971, Price and Greek nuclear physicist Charalampos Karakalos made X-ray and gamma-ray images of the 82 fragments. Price published a paper on their findings in 1974.[13]

Two other searches for items at the Antikythera wreck site in 2012 and 2015 yielded art objects and a second ship which may, or may not, be connected with the treasure ship on which the mechanism was found.[39] Also found was a bronze disc, embellished with the image of a bull. The disc has four "ears" which have holes in them, and it was thought it may have been part of the Antikythera mechanism, as a "cog wheel". There appears to be little evidence that it was part of the mechanism; it is more likely the disc was a bronze decoration on a piece of furniture.[40]

The Antikythera mechanism is generally referred to as the first known analogue computer.[41] The quality and complexity of the mechanism's manufacture suggests it must have had undiscovered predecessors during the Hellenistic period.[42] Its construction relied on theories of astronomy and mathematics developed by Greek astronomers during the second century BC, and it is estimated to have been built in the late second century BC[6] or the early first century BC.[43][7]

In 2008, research by the Antikythera Mechanism Research Project suggested the concept for the mechanism may have originated in the colonies of Corinth, since they identified the calendar on the Metonic Spiral as coming from Corinth, or one of its colonies in northwest Greece or Sicily.[9] Syracuse was a colony of Corinth and the home of Archimedes, and the Antikythera Mechanism Research Project argued in 2008 that it might imply a connection with the school of Archimedes.[9] It was demonstrated in 2017 that the calendar on the Metonic Spiral is of the Corinthian type, but cannot be that of Syracuse.[44] Another theory suggests that coins found by Jacques Cousteau at the wreck site in the 1970s date to the time of the device's construction, and posits that its origin may have been from the ancient Greek city of Pergamon,[45] home of the Library of Pergamum. With its many scrolls of art and science, it was second in importance only to the Library of Alexandria during the Hellenistic period.[46]

In 2014, a study argued for a new dating of approximately 200 BC, based on identifying the start-up date on the Saros Dial, as the astronomical lunar month that began shortly after the new moon of 28 April 205 BC.[25][26] According to this theory the Babylonian arithmetic style of prediction fits much better with the device's predictive models than the traditional Greek trigonometric style.[25] A study by Iversen in 2017 reasons that the prototype for the device was from Rhodes, but that this particular model was modified for a client from Epirus in northwestern Greece; Iversen argues it was probably constructed no earlier than a generation before the shipwreck, a date supported by Jones in 2017.[49]

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