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77 points lapnect | 3 comments | 17 Nov 24 07:52 UTC | HN request time: 0.663s | source

1. alnwlsn ◴[21 Nov 24 17:12 UTC] No.42206380[source]▶

The simplest explanations I have found for involute gears is from one of those old 50's training films[0]. Not sure if this is the same one, but the first few minutes give a very intuitive explanation of where the involute shape comes from.

[0] https://www.youtube.com/watch?v=Wlp8RxFt0ec

replies(2): >>42221768 #>>42221967 #

2. _xerces_ ◴[23 Nov 24 16:43 UTC] No.42221768[source]▶

>>42206380 (TP) #

This old training video is great too, it also mentions the idea touched upon in the article that gear teeth are levers:

Spinning Levers - How A Transmission Works (1936) https://www.youtube.com/watch?v=JOLtS4VUcvQ

3. _xerces_ ◴[23 Nov 24 17:11 UTC] No.42221967[source]▶

>>42206380 (TP) #

The idea of shining polarized light through gears made of Lucite to view the stress lines at the point of tooth contact is genius!

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A 15-minute intro to involute gears