Gear

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DerivePi
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Gear

Post by DerivePi »

gear.jpg
gear.jpg (72.39 KiB) Viewed 2834 times
This is an 8 tooth gear (really a pinion) with involute teeth, appropriate undercut and a keyway.

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impetus maximus
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Re: Gear

Post by impetus maximus »

very cool. what software did you make this in?

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darkfrei
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Re: Gear

Post by darkfrei »

impetus maximus wrote:very cool. what software did you make this in?
It's very easy to make it in blender.

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DerivePi
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Re: Gear

Post by DerivePi »

Blender does well for the involute because it has a curve function that can approximate the tooth shape. I don't know how you'd get the right shape for the undercut though unless you just did a fillet. I used AutoCAD to get the gear shape (I used a step wise process) and then finished the model in 3DS Max. Missed some smoothing groups though. I'll have to fix it later.

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darkfrei
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Re: Gear

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Re: Gear

Post by DerivePi »

Bevel Gear Animation
Of course bevel gears are far more fascinating (and take a bit longer to model) -

darkfrei, that's a nice online resource. They don't properly account for undercut though. Not important unless you have a very high gear ratio like 200 to 7. If you animate the gears, you can see the tip interference.

-put gif in spoiler
Last edited by DerivePi on Mon Mar 13, 2017 6:47 pm, edited 1 time in total.

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darkfrei
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Re: Gear

Post by darkfrei »

A long time ago I wrote a program in Excel, which can draw involute (russian name: evolvent). Just in case saved.
evolventa_in_excel.PNG
evolventa_in_excel.PNG (254.64 KiB) Viewed 2729 times
:arrow: :arrow: :arrow: Gif is 2,5 MB!
gif must be under spoiler
The file for downloading:
Рабоч геометрия зуба012.7z
(390.59 KiB) Downloaded 75 times

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DerivePi
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Re: Gear

Post by DerivePi »

darkfrei - that is elegant

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