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Isn't the range 1700-4200 OPM?
It's not like you need to know what each numbers speed is but what each number is good for.
To quote Mike Phillips:
"Typical speeds for most procedures using most DA Polishers
5-6 Speed setting for removing swirls
4-5 Speed setting for polishing after swirls are removed
3-4 Speed setting for machine applying a wax."
You'll also need to know what product goes best with what job/condition of paint. And what pads are best for each job.
There's plenty of write ups here, just type in basic keywords and get reading. Or search for Mike Phillips articles and you'll have days and days worth of reading!
Edit: Here you go.
http://www.autogeekonline.net/forum...ke-phillips/23722-articles-mike-phillips.html