Mechanical calculator design problems

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SUMMARY

The discussion focuses on the design challenges of a mechanical calculator utilizing spur gears, bevel gears, and Leibnitz drums. The user seeks guidance on determining the dimensions of these gears, specifically thickness and diameter, and questions whether to select convenient sizes or conduct a specific analysis. Recommendations include referencing existing designs such as natural gas flow meters and car odometers for inspiration. The materials specified for the components are custom-made nylon.

PREREQUISITES
  • Understanding of mechanical design principles
  • Knowledge of gear types, specifically spur and bevel gears
  • Familiarity with the Leibnitz drum mechanism
  • Basic skills in CAD software for modeling mechanical components
NEXT STEPS
  • Research gear design calculations for thickness and diameter
  • Study existing mechanical calculator designs for dimensional references
  • Learn about material properties of nylon in mechanical applications
  • Explore CAD software techniques for simulating gear interactions
USEFUL FOR

Mechanical engineers, product designers, hobbyists in mechanical systems, and anyone involved in the design of mechanical calculators or similar devices.

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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