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Introduction • On Precision Pots • General Product Definitions • Construction Details • Multiturn Precision Pots • Resistive Elements • Terminals • Shaft-Rotor Assembly • Mechanical Rotation • Mounting Methods • 3540 Family • 3590 Family • Knobpot 3600 Family • Single-Turn Precision Pots • 6537/6637 Family • 6539/6639 Family • 3680 Pushbutton Family • Special Precision Pots • Shafts • Mounting Styles • Bearings • Torque • Linearity • Wiper Load • Low Current Applications • High Rotational Speed • Angles • Additional Taps • Sealed Units • Multicup Assemblies • Envelopes •
Environmental • Competition •
Useful Terms
Bearings
Bearings must be suitable for the end application or operating environment. Most Bourns servo-mount models are designed with front and rear ball bearings, and are better suited to applications having greater side loads and higher rotational life requirements. Bushing mounted models employ aluminum, brass or plastic bearings and are best suited to input or calibration type applications.
It is more common to upgrade sleeve bearings with ball bearings than the latter. Sleeve bearings have a slightly higher torque, radial play and lateral runout tolerances. Ball bearings provide lower torque and higher rotational life. Upgrading sleeve bearings with ball bearings add cost to the model.
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