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Chapter 7 Bearings, Couplers, Gears, Screws, and Springs 191
FIGURE 7-1 Linear bushings on MakerBot’s CupCake CNC (image used
with permission from MakerBot Industries)
Linear
bushings
Radial Bearings
The purpose of any radial bearing is to support a spinning shaft or rod and keep it
running smoothly, even if things like gears and pulleys create radial loads on the
supported shaft. Some radial bearings have rolling elements that reduce friction.
These are called ball bearings when the rolling element is a ball, or roller bearings
when the rolling element is more like a long cylinder or needle (see Figure 7-2).
FIGURE 7-2 Radial ball and roller bearings (credit: McMaster-Carr)
