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June 18th, 2017, 01:17 PM   #1
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Long Compound Gear Train ratio

Greetings. I am building a board game that utilizes time travel by means of a compound gear train. Each gear will represent a different unit of time, and I would like an idler gear in between so the time gears all move clockwise/counterclockwise at the same time. The units I am using are day (7:1), week (4:1) month (12:1) year (10:1) decade (10:1) century (10:1) millennium (10:1) myriad (10:1) centium (10:1) age (8 teeth).

The ratios put together are 7:1, 4:1, 12:1, 10:1, 10:1, 10:1, 10:1, 10:1, 10:1, 8:1

So here is the issue I am having. I don't want to have any of the gears have odd-numbered teeth, and I don't want massive-tooth gears (none above 60), and the smallest amount of teeth I want on any gear to be 8. I was trying to avoid having to use pinion gears but it looks like I will have to anyway. What is the best setup for this gear train?

What I have for starters is the day to week ratio which will be a compound gear, either 10:20 and 8:28 or 8:20 and 10:28. It gets tricky for me to calculate after that because of the next 4:1 ratio. I also tried started working backwards from the age gear (8 teeth) too but didn't make it very far.

Last edited by davidbenjamindix; June 18th, 2017 at 01:32 PM. Reason: mispellings
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June 18th, 2017, 01:53 PM   #2
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Code:
(56:8)
(32:8)
(48:(8:(16:8)))
(40:(8:(20:10)))
(40:(8:(20:10)))
(40:(8:(20:10)))
(40:(8:(20:10)))
(40:(8:(20:10)))
(40:(8:(20:10)))
(40:(10:(20:10)))
Does this make any sense?
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June 18th, 2017, 02:38 PM   #3
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It makes perfect sense! Thanks so much. That's the answer I was looking for. For some reason I hit a mental block while trying to figure it out. Thanks again!
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June 18th, 2017, 02:46 PM   #4
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Good to know, that I was of some help.
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