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Old 11-16-2017, 07:12 AM   #61
Buchanan
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Here is a link to another months work on the clock. This is what happened in October. http://www.my-time-machines.net/astro_10-17.htm

It is mostly about how I produced cams to give a annual cycle of positions on the shutters that display the length of day and night. It would, no doubt, be possible to calculate the correct profile for the cams, but, then one must machine them to those dimensions, I do not have a CNC cam grinder ( there are some beauties on this site!) so I have to do it manually. It took about a week to make these two cams. I think if I went the calculation route, I would have taken longer, as, I would need to learn how to do it first and then make a cam machining fixture to fit on my mill. If there were any errors after that I would have to correct them with a file anyway!

Sorry ,No new photos as I have not done much since the last post.

Thanks for the compliments, they are really appreciated.
Buchanan


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Old 11-16-2017, 11:02 AM   #62
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I watched your video. What a magnificent instrument. I am in awe of your skills. Simply beautiful.

Rick
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Old 12-04-2017, 08:33 AM   #63
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I have started the final assembly of the moon dial .Most parts are finished to 1000 grit sandpaper and then given a quick rub with Brasso to brighten them up. The two plaques are just paper at the moment. They will be fired enamel with a brass frame finally.
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Old 12-09-2017, 01:01 AM   #64
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I needed some small stars for the day/night shutters.

I had some ‘scrap’ Stirling silver from a previous clock dial so decided to use it. A simple five sided star toolpath was manually written in g code and a Dimond point milling cutter made and the machining trials started. By varying the angle of the cutter and the slope of the tool path an acceptable star was machined. Taking a leaf out of Terrys(Merlin) book, I machined away the back of the star until it was complete. The stars are attached to the glass with shellac.
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Old 12-21-2017, 08:44 PM   #65
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The sun/moon dial is almost complete. I am working on how to get fine black lettering on thin glass that is real permanent and not having much luck. The best results so far are laser etching through a ceramic spray that should give a dense black print but not the best results so far. If any body knows how to print fine 2mm high numbers in black on glass I would love to hear about it. The complete mechanism is mounted on the clock now and just waiting for the glass dial. The machining operation is when I needed a circular round groove in the back of the dial to provide clearance for the moon. Buchanan


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