Mechanics Week 5 Quiz (Ball Bearings)

Question 1

What are the characteristics of a Conrad Bearing?

Answer 1

Moderate Radial Load
High Radial Speed
Moderate Thrust Load in both directions.

Question 2

What are all other ball bearings compared to?

Answer 2

Conrad Bearing

Question 3

What are the characteristics of Filling Slot Bearings?

Answer 3

Higher Radial Load (than Conrad)
Lower Radial Speed (than Conrad)
Lower Thrust Load (than Conrad):
Thrust Load = 0 with no load on bearing
Thrust load only goes toward the face.

Question 4

What are the characteristics of Double Row Deep Groove Bearings?

Answer 4

Higher Radial Load (than Conrad)
Same Radial Speed as Conrad
Higher Thrust Load (than Conrad)

Question 5

What are the characteristics of Self Aligning Bearings?

Answer 5

Lower Radial Load (than Conrad)
Lower Radial Speed (than Conrad)
Higher Thrust Load (than Conrad)
Help reduce/remove vibrations and fix alignment issues.
2 row on independent rings (Inner Race)
Spherical Outer Race

Question 6

What are the characteristics of Angular Bearings?

Answer 6

Lower Radial Load (than Conrad)
Lower Radial Speed (than Conrad)
Higher Thrust Load (than Conrad)
3 orientations:
•Tandem (Stops Thrust in 1 direction)
•Face to Face (Stops Thrust in both directions)
•Back to Back (Stops Thrust in both directions)

Question 7

What are the characteristics of Thrust Ball Bearings?

Answer 7

Lower Radial Load (than Conrad)
Lower Radial Speed (than Conrad)
Higher Thrust Load (than Conrad)
Vertical (Think of your chair)
Parallel to axis of rotation

Question 8

What are the two types of Thrust Ball Bearings?

Answer 8

Flat Race Flat Seat (Less Precise, 2/3 lower) and Groove Race Flat Seat

Question 9

What are the pros and cons of Super Precision Bearings?

Answer 9

Pros:
•Exact Rotation
•Tight tolerance
•High Accuracy
•Limited End Play
•High Speeds
Cons:
•Difficult to properly lubricate
•Cannot handle vibration or shock
•Expensive as fuck

Question 10

Why would we use ungrounded bearings?

Answer 10

They are cheaper and can take abuse.

Question 11

What are the characteristics of Thin Section Bearings?

Answer 11

Lower in Load (Radial and Thrust) and Speed (than Conrad)
Fit in tighter envelopes

Question 12

What are the 3 most common issues related to premature failure in bearings?

Answer 12

Lubrication, Contamination, and Misalignment

Question 13

How can you differentiate between grounded and ungrounded bearings?

Answer 13

Look for the “C number” on the side of the bearing (Most common grounded bearings are C 3, ungrounded will not have one)