Router RPM

For any that are interested I recorded router RPM at each setting today.
These are all ball park as there are not detentes for the numbers and I rounded each to the nearest 50

1, 15500
2. 16750
3. 18750
4. 20650
5, 23200
6, 27000

How did you measure the RPMs? What is your testing setup?

WJ

There are several ways you could do this but the one I used was spectral analysis, amazing how a smart phone and a 10 dollar app can do what took a 100k machine to do 30 years ago!
I used a program called FFT, the only challenge was to get it to lock on the fundamental and not a harmonic.
After getting the frequency we just multiply by 60 to get the RPM.

Hi Mark,

This is really a nifty little example of how much more accessible technology is to us these days ... and a pretty clever application of it on your part.

Ted Hall, ShopBot