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THE HEALD MODEL 275 "PLAIN" INTERNAL GRINDER IS ENGINEERED FOR PRECISION BORE GRINDING APPLICATIONS. KEY FEATURES INCLUDE A 72-INCH EXTENDED, SWIVELING-TYPE BRIDGE AND FAGOR DIGITAL READOUTS FOR PRECISE POSITIONING. THE MACHINE IS EQUIPPED WITH A 10-INCH 6-JAW CHUCK AND A HEALD "RED-HEAD" GRINDING SPINDLE, POWERED BY A 5 HP/3600 RPM MOTOR, ALONGSIDE A 1.5 HP WORKHEAD CHUCK MOTOR.
THE GRINDING CAPACITY ACCOMMODATES A MAXIMUM 16-INCH SWING OVER THE TABLE AND INSIDE THE COOLANT SPLASH GUARD. IT IS CAPABLE OF GRINDING BORE DIAMETERS RANGING FROM A MINIMUM OF 0.125 INCHES UP TO A MAXIMUM OF 8.5 INCHES, WITH A MAXIMUM BORE LENGTH OF 5 INCHES. THE WORKHEAD PROVIDES (4) SPINDLE SPEEDS FROM 133 TO 400 RPM, AND THE TABLE OFFERS INFINITE LONGITUDINAL TRAVEL SPEEDS FROM 0 TO 20 FPM OVER A 16-INCH MAXIMUM TRAVEL. CROSS FEED CAPABILITIES INCLUDE ROUGHING IN THE RANGE OF 0.0001 TO 0.0005 INCHES AND A FINISHING CROSS FEED OF 0.0001 INCHES. THE MACHINE FEATURES A MAXIMUM INCLUDED BRIDGE GRINDING ANGLE OF 17 DEGREES AND A MAXIMUM WORKHEAD SWIVEL ANGLE OF 60 DEGREES. APPROXIMATE WEIGHT IS 13,000 LBS WITH OVERALL DIMENSIONS OF 14'9" L X 5'6" W.