hyrodium: The reason why Involute gears turn smoothly. Fig 1) How to draw involute of circle.Fig 2&3) Move and rotate the observing point.Fig 4&5) The curves are tangent.Fig 6) Involute gears turn smoothly.
tags: cool JAPAN？,
from: https://www.tumblr.com/blog/view/pochone/123371614353
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