Patent 8133093 was granted and assigned to Strasbaugh on March, 2012 by the United States Patent and Trademark Office.
A grinding machine wherein coarse and fine grind wheels are mounted to a single rotating spindle. A multiple grind wheel mount is attached to the lower portion of the rotating spindle, the coarse and fine wheels being supported by the wheel mount, the wheel mount containing the mechanism for moving the inner coarse wheel down relative to the stationary outer fine wheel.