Page 12 - 810 Trianing Book Extract

C

Machine setup questions
Explanations and diagrams

6
Bearing type?
Roller or journal bearings
Flexible coupling bearing
Cylindrical roller bearing

Roller: Roller bearings support a load with round
rolling elements

Journal: Journal bearings support a load without
round rolling elements

Flexible coupling bearing
Cylindrical roller bearing Journal bearing Rigid coupling bearin
g
Roller bearing Journal bearing

If in doubt, select roller bearings

Hints and tips

Roller bearings include any bearing with rolling elements: balls, cones, tapered roller, etc. Roller bearings
have a different wear pattern than journal bearings.

Journal bearing Rigid coupling bearing
Journal bearings include any bearing without rolling elements: sleeve, journal, Babbitt, etc. They use soft

metal and sometimes an oil bath instead of rolling elements.

If in doubt, select roller bearings because roller bearings are far more common than journal bearings.

7
Motor detached from drive train?
Detached motor

Yes: tests the standalone motor only. Make sure there Bearing locations

are no components on the motor shaft.

No: tests the motor and components.

In most cases, select No and go to step 8.
Selecting Yes does not remove vibration from
components on the end of the motor shaft.

Hints and tips

Use this selection when testing a brand-new motor or a motor after it returns from the motor shop with
NOTHING on the end of the shaft. No coupling, belt, gearbox, or directly to an impeller or fan.

66 Section 2: Vibration tester training manual