Care & Truing Diamond Wheels
The first thing is mounting you Diamond/CBN wheel on your spindle. The spindle needs to be in good condition and running true on your grinder, if this is not the case you will reduce the life of you wheel or possibly destroy the wheel as well as your parts being ground. Carefully mount your diamond/CBN wheel on a cleaned true running spindle, making your wheel as concentric as possible. After mounting your wheel you will still need to true it to the spindle so its entire cutting surface of the wheel is concentric to within 0.001 inches or better.
The truing of your Resin Bond diamond/CBN wheel can be done by using a Newman Model# 1 Wheel Dresser (for small wheels 4" to 8" up to 1" wide), brake controlled truing device (Newman Model# 11, for your most common sizes from 6" to 18" up to 2" wide), or a reversible motor powered device (Newman Model# 12 Air Reversible Motor Dresser, use on almost any size wheel.). The dresser wheel used for truing are generally silicon carbide and the basic sizes are 3"OD x 1"wide x ½" or ¾" hole for the brake device and motorize device, and smaller Newman Model# 1 Dresser wheels are 2-1/2" x 1/2" x 1-1/8" hole.
When truing your diamond/CBN wheel with one of these devices you are brining the surface of the wheel into truth with the center of the spindle rotation. Truing the wheel also will level the diamond/CBN to the surface of the bonding agent, and when the wheel is in this condition it can not grind.
Their is one last step you need to perform to restore the diamond/CBN wheel to its full cutting efficiency. All Resin bond wheels need to be DRESSED after being trued, and this is done by using a stick of aluminum oxide abrasive on the cutting face of your wheel. By using the aluminum oxide abrasive dressing stick you are removing the resin between the diamond/CBN, exposes the cutting points. When the wheel abrades the dressing stick very rapidly, this is the indication that the wheel has been conditioned and is ready for grinding.
NOTE: If your diamond/CBN wheel need to be redressed and conditioned frequently you most likely are using the wrong wheel for the job or the operating condition probably aren't right for that particular job. This means you need to reevaluate the methods and technique of the operator, and/or the wheel property's (type of wheel, grit size, bond type, bond hardness, speed rates, dry or wet grinding and contact pressure).
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