When installing a ball bearing on a shaft using an arbor press, it is necessary to apply the pressure to which race?

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Multiple Choice

When installing a ball bearing on a shaft using an arbor press, it is necessary to apply the pressure to which race?

Explanation:
Pressing the inner race onto the shaft is the correct approach. The inner race is the part that forms the interference fit with the shaft, so applying the force there drives the bearing cleanly onto the shaft and seats it squarely without distorting the outer race, balls, or cage. Pressing on the outer race can deform the outer race or misalign the rolling elements, risking damage to the bearing and improper seating. Use a driver that contacts only the inner race (with soft jaws or a soft-faced tool) and keep the outer race supported to prevent distortion.

Pressing the inner race onto the shaft is the correct approach. The inner race is the part that forms the interference fit with the shaft, so applying the force there drives the bearing cleanly onto the shaft and seats it squarely without distorting the outer race, balls, or cage. Pressing on the outer race can deform the outer race or misalign the rolling elements, risking damage to the bearing and improper seating. Use a driver that contacts only the inner race (with soft jaws or a soft-faced tool) and keep the outer race supported to prevent distortion.

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