Services - Indiana Precision Grinding - Partners in Precision- grinding rotary precision ,A major advantage of double disk grinding is that production rates are generally 100 percent greater than those obtained with surface grinding. Features 1 Horizontal Spindle Rotary Carrier GrinderTire and Trunnion Grinding - Rotary Service CompanyWe specialize in tire/trunnion grinding, (resurfacing), and two phase precision alignment for all trunnion mounted rotary vessels.