When installing a bearing on a fearless machine with a class #7 fit, which two items are essential?

When installing a bearing with a class #7 fit, it is crucial to ensure a precise fit that allows for proper function and longevity of the assembly. Using dry ice and a bearing heater is essential in this context because they facilitate the appropriate temperature adjustments needed for installation.

Dry ice can be used to shrink the bearing slightly, allowing it to fit onto the shaft or into its housing more easily. By reducing the size of the bearing temporarily, installation becomes less forceful, minimizing the risk of damaging either the bearing itself or the surrounding components.

Conversely, a bearing heater is used to heat the bearing uniformly, which expands it, enabling a smooth and straightforward installation process onto a shaft. Proper heating ensures that the bearing aligns correctly without excessive force, thereby preventing misalignment or surface damage that can occur with improper fitting methods.

Overall, the combination of dry ice and a bearing heater promotes optimal installation conditions that avoid issues commonly associated with less careful fitting methods.