Harbor Freight Tools 62556 User Manual - Page 9

Installing a Non-threaded Grinding Wheel or Cut-Off Wheel 1. For a Grinding Wheel, it MUST be: • rated to at least 11,000 RPM • no larger than 4-1/2" in diameter • fitted with a 7/8" round arbor hole • from 0.16" to 0.28" thick • a type of grinding wheel suitable for surface grinding, not edge grinding • dry and clean • proven undamaged by inspection and by the ring-test explained below For a Cut-Off Wheel, it MUST be: • rated to at least 11,000 RPM • no larger than 4-1/2" in diameter • fitted with a 7/8″ round arbor hole • suitable for edge grinding, not surface grinding • dry and clean • proven undamaged by visual inspection and by the ring-test explained below WARNING: When using a Cut-Off Wheel, a wheel guard designed specifically for Cut-Off Wheels (not included) must be installed for adequate protection if the wheel fails. Wrench Flange Nut Flange Grinding Wheel Spindle Spindle Lock 2. Press in and hold the Spindle Lock to prevent the Spindle from turning. 3. Remove the Flange Nut. Keep the Flange in position on the Spindle. 4. Closely inspect the Grinding or Cut-Off Wheel before mounting. Perform a ring-test on the wheel (unless wheel is smaller than 4" or is an unusual shape) as follows: a. Suspend wheel using a dowel or finger through the arbor hole. Hang Wheel from Dowel Tap Wheel Here 45° 45° V E R T I C A L C E N T E R 45° 45° b. Tap the flat side of the wheel with a light nonmetallic object, such as a screwdriver handle, at a point 45° from the vertical center line on each side of the wheel and 1 - 2 inches from the edge of the wheel (see Illustration). c. Rotate the wheel 90° and repeat the test until the entire wheel has been checked. d. An undamaged wheel will give a clear tone. If cracked, there will be a dead sound and not a clear ring. 5. For wheels with paper gaskets (blotters) or metal gaskets: Slip the wheel onto the Spindle with the gasket first. The gasket should be centered on the wheel and the wheel and gasket should rest flat against the Flange. WARNING: To prevent serious injury, gaskets must be used for all grinding wheels they are provided with. Gaskets help prevent grinding wheel damage and wheel slippage, causes of wheel failure. 6. Thread the Flange Nut onto the Spindle. Wrench tighten only enough so that the wheel is securely held on the spindle. WARNING: To prevent serious injury, do not overtighten Flange Nut. Overtightening can damage the wheel, causing wheel failure. Model 62556 For technical questions, please call 1-888-866-5797. Page 9