Someone who knows the speed of the different grades at 611
http://www.ebay.com/sch/i.html?_odkw=tachometer&_osacat=0&_from=R40&_trksid=p2045573.m570.l1313.TR6.TRC2.A0.H0.Xhand+held+tachometer.TRS0&_nkw=hand+held+tachometer&_sacat=0
Just leave it on the lowest (1) setting. You will get the best control and longest life.
Thank´s guysThat helped alot.
Take care and keep cutting
Kristian