Eight principles of centerless grinding, number five

5. Angle affects the success of centerless grinding.

The Angle of contact between centerless grinding wheel and parts is very important to achieve proper roundness and tolerance.

Usually, the center of the regulating wheel and grinding wheel are set at the same height on the machine, and the center of the workpiece is higher. However, if the workpiece is set too high, chatter may occur. If the workpiece is set too low, it may not be round.

The goal is to keep the part (1) in contact with the regulating wheel, and (2) rotating at a slower speed while the faster, larger abrasive wheel applies force, thus producing accurate roundness of the part. Using the correct wheel Angle helps to ensure that the entire surface of the wheel is in use.

If the Angle of the adjusting wheel is too sharp, the workpiece may go too far into the grinding area. This can lead to uneven wear, thinning and shortened wheel life. If the regulating wheel is too close to parallel to the grinding wheel, it can cause parts to stall between the grinding wheels or, in the worst case, result in workpiece/grinding wheel collisions.

The Angle of the workpiece fixture is also crucial. For example, when grinding with a 4-inch (101.6 mm) wide superhard wheel, the remaining blades usually work well at 30º.

However, if the grinding wheel is 6 inches (152.4 mm) or 8 inches (203.2 mm) wide, the same Angle may put too much pressure on the grinding wheel and cause chatter. In this case, changing the Angle to 20º or 25º will reduce the pressure and eliminate chatter on the part.

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