Anti Friction

Question 0

What are the 3 functions of the cage

Answer 0

Prevent rolling elements rubbing together
Push the rolling elements through the unloaded zone
Guide the rolling elements with minimum friction

Question 1

What typically are anti friction bearings made up of

Answer 1

Inner ring
Cage
Rolling elements
Outer cage

Question 2

Rolling elements can be spherical or, can you name the others

Answer 2

Round
Cylindrical
Needle
Tapered

Question 3

What is the difference between a ball and a roller

Answer 3

A ball only has one point of contact

Rollers have line contact and can handle more load due to surface area contact

Question 4

In an ISO bearing designation what is the first number

Answer 4

This signifies the type or style of bearing

Question 5

The most common bearing by ISO designation are 2, 6 and 7. What are they

Answer 5

2 spherical
6 deep groove single row
7 angular contact

Question 6

What is the loaded zone

Answer 6

This is the area the rolling elements are under load

Question 7

What is the other name for a single row deep groove ball bearing

Answer 7

Conrad

Question 8

A Conrad bearing is best suited to what type of load

Answer 8

Radial, but can support moderate axial

Question 9

What is the benefit of a double row deep groove ball bearing

Answer 9

It provides more radial load capacity without increasing radial dimension

Question 10

Can an angular contact ball bearing handle axial loads

Answer 10

Yes they support radial load and substantial thrust load in one direction

Question 11

When angular contact bearing are used they can be used in pairs what arrangement does this come in

Answer 11

Back to back
Face to face
Tandem

Question 12

A 4 point angular contact can only be used on which loads

Answer 12

Combination loads or axial so the load doesn’t run on the split in the middle of the ring

Question 13

Cylindrical rollers support what loads

Answer 13

Purely radial

Question 14

What are the 3 most common needle roller setups

Answer 14

A drawn steel cup
No cage or inner ring
Machined inner and outer rings

Question 15

Needle rollers support what type of load

Answer 15

Radial only

Question 16

A tapered roller bearing is made up of what components

Answer 16

Cup
Cone
Rolling elements
Cage

Question 17

Tapered roller bearings allow for only axial loads true or false

Answer 17

False

For heavy combined loads and thrust in only 1 direction

Question 18

Spherical roller bearings are not self aligning true or false

Answer 18

False

the rolling elements are barrel shaped and the outer race has a spherical track for internal self alignment

Question 19

What is a CARB bearing

Answer 19

Compact aligning roller bearing
Not recommended for thrust load, it is radially compact like a needle but with some misalignment capability like a spherical

Question 20

In ISO designation what do the last 2 digits tell us

Answer 20

The nominal bore size x5 in mm so 08 would be 40mm

Question 21

If the bearing has a bore bigger than 500mm how does the ISO read

Answer 21

The size will be given after /

Question 22

How do you know the size of a bore if it’s under 20 mm

Answer 22

The last 2 digits will be

00, 01, 02, 03 being 10, 12, 15, 17mm respectively

Question 23

If the bearing has a tapered bore which end is the nominal size

Answer 23

Small end

Question 24

Some bearings will show a C2 or C4 what does it mean

Answer 24

C1 to C5 is a clearance designation with 1 tight and 5 loose between 2&3 is normal clearance so a C3 would have bigger than normal clearance

Question 25

There is a designation for a tapered bore what is it and what does it signify

Answer 25

K or K30

K being 1:12 taper and K30 being a 1:30 taper

Question 26

If a bearing speed is doubled what is its life span

Answer 26

50%

Question 27

If a bearings life is cut by 90% what did you do to it

Answer 27

Doubled the load

Question 28

Bearing failure main cause is what

Answer 28

Contamination

Question 29

What can be done to prevent contamination and what designation will tell you this

Answer 29

Shields or rubbing seals
Shield is metal, designated by Z and is attached to only one race
RS is for rubbing seals and they make contact with inner and outer

Question 30

120* is an ok temp to heat an 62103 RS bearing true or false

Answer 30

False this bearing has rubbing seals and should not be heated over 80*

Question 31

Why is it important to have correct clearance

Answer 31

So the rings don’t spin on their seats
Rolling elements don’t skid
Rolling elements don’t bind
Axial clearance or preload is present