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tpoindexter's Blog

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How to test motor speeds (RPM)

tpoindexter

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I was talking with another tech this morning about checking RPM. this brought up the subject of strobes. As we were

discussing strobes it occurred to me someone had probably created an app with RPM already. Shazaaam!!! :woot:

Here's a app that will allow you to test RPM on fans. You can also test motor rpm, if, you place a mark on the shaft.

https://itunes.apple.com/us/app/strobe-light-tachometer-to/id708094321?mt=8

To check fan speed just dial it in till the fan appears to be not moving at all. That'll give you your RPM.

Same with a motor if you mark the shaft. When the mark appears to no longer be moving you've got the RPM.

I'm not really sure if this is the correct use of this Blog thingy, but, bet I'll find out sure enough!! Yeeehaw!!!

Huh... I hope I wasn't the last person on earth to figure this out!

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DurhamAppliance

Posted

Excellent info Brother Tpoin!

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Samurai Appliance Repair Man

Posted

Cool tip, Tracy, thanks!

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Smashycomman

Posted

That's very cool, thank you.

 

Also, are we all able to make out own blogs? I still haven't found the button to let me do this.

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Samurai Appliance Repair Man

Posted

 

Also, are we all able to make out own blogs? I still haven't found the button to let me do this.

 

 

Incorrect setting on the back-end. I think I fixed it, try it again and let me know. 

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LI-NY Tech

Posted

Cool, also available for Android.  Nice find.

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Can wait to use it,

Thanks for info.

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Smashycomman

Posted

Incorrect setting on the back-end. I think I fixed it, try it again and let me know. 

 

There we go! Now I have the "create a blog" button. I DON'T, however, have a notification when someone replies to my comments on blogs... maybe that's just something I need to check somewhere in my preferences... I'll have to look.

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One simple mistake that would be easy to make.  If you set the phone to say the 500 rpm setting but the machine was moving at say 1000 rpm, it would still look like it was giving a good reading.  Just like any good tool, you must know the limitations and parameters of function.

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This was method was used by millions of homeowners across the land for like 25 years... to calibrate the speed of their turntables when the record started to sound funny... I still have one of the test patterns you set on the turntable.

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