Our latest in-house test was done on 5" Q-125 using a different grade of impreg. We held the Test target in our tool holder and turned the test mill in the lathe at 320 RPM with moderate force (est 30-50 lbs)

We took a couple of .020" cuts for about 2" length (less than 1 min each) and then several passes at .030" to total .190" depth of cutting in the 7 cuts in a total time of about 3 1/2 minutes HPI inserts mounted in a steel insert holder