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Forum Index : Other Stuff : a way to count rpm?

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johnj
Newbie

Joined: 05/04/2008
Location: Denmark
Posts: 17

Posted: 07:47am 24 Sep 2009

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Instead of messing with bicycle computers and stuff, I thought why not paint stripes on the hub of the mill/whatever device you have, to get an idea of rpm.
I had these stripes, (are they stroboscopic?), on my old record player.
You could have a set of stripes for cut-in, and what ever you wish to know.

Anyone tried this? howto do it?

cheers, J

davef
Guru

Joined: 14/05/2006
Location: New Zealand
Posts: 499

Posted: 09:36am 24 Sep 2009

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The system you are talking about was to adjust the turntable speed to within a few percent of the correct speed.

Do a search on optical sensors like found in PC mice. Or slotted disc.

Good luck

MacGyver

Guru

Joined: 12/05/2009
Location: United States
Posts: 1329

Posted: 04:28am 10 Oct 2009

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I'm working on a blade-pitch system that actually allows the windmill to speed up instead of slow down. When it's done, I intend to paint one blade white so it can be tracked with a video camera. If you're interested in a windmill's rpm, maybe this will work for you as well.

Nothing difficult is ever easy!
Perhaps better stated in the words of Morgan Freeman,
"Where there is no struggle, there is no progress!"
Copeville, Texas

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