Mechanical calculator design problems

AI Thread Summary
The discussion revolves around the design challenges of a mechanical calculator, specifically focusing on determining the dimensions of gears such as thickness and diameter. The designer seeks guidance on whether to select convenient sizes or conduct specific analyses for optimal gear dimensions. Suggestions include referencing existing mechanical devices like natural gas flow meters and car odometers for inspiration. Additionally, there is mention of the historical context of mechanical calculators, with examples of older models like the Friden and Marchant. Overall, the conversation emphasizes the need for careful consideration in gear design to ensure functionality.
kevjcarvalho
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hey...i have designed a mechanical calculator...i am using spur gears, bevel gears and stepped drums(Leibnitz drum)...my design is ready but the problems is how do i decide the dimensions of the gears like thickness, diameter etc...do i just select a convenient size...or do i do some analysis...if yes what analysis?...all my components will be made from nylon...custom made...please help...i have attached different views of the model with the frame removed...
 

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Why? Natural gas flow meters and car odometers both have rotating dial mechanical readout with decimal carry. Copy them. About 40 years ago I sold my mechanical Friden desk calculator with multiply and divide for $25. I suspect you can still find them (or Marchants) in 2nd hand stores.
Bob S
 

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