By Wheels I. Marinescu, et al

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The diamond disc is now rotating, introducing balance issues and the potential for chatter and a resulting “orange-peel” appearance to the ground surface. Fractional multiples of the roll/wheel rpm can induce chatter and should be avoided. These are not just simple ratios such as 1:2 or 1:3 but can be as subtle as, for example, 7:13 or 5:11. Small adjustments in wheel or roll rpm can have a major impact on the quality of the ground surface. 17 Effect of dressing speed ratio on surface roughness and dressing force.

There are a couple of exceptions, however: dressing small and/or low concentration wheels. 2 JIG GRINDING Jig grinding, such as on Moore jig grinders, uses a range of CBN and diamond wheels. The process has a relatively low stock-removal requirement because most applications are still performed dry and the wheels must be mounted on long quills to get deep into, for example, mold cavities. The wheel spindle is usually pneumatically driven and can be slowed to a few hundred rpm for dressing, making the wheel act extremely soft.

Certainly the lower processing temperatures result in low distortion. Therefore the amount of and variation in lap, and hence, consistency of performance from one roll to another, is less. However, lapping, accompanied by some mechanical or chemical exposure of the diamond, is often critical to control the diamond surface density throughout the profile. After lapping, the roll is balanced, and a coupon cut to confirm profile. Standard tolerances on profiles are typically 40% to 70% of that allowed on the component.

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