Ball Bearings Test 3

Question 0

What is used to check for the amount of contact area between journal and bearing? Describe the method.

Answer 0

Dykem, put the bluing on the bearing then put the journal in and tighten to correct clearance, and turn the shaft to see where the Dykem is left then scrape the bearing for proper contact area.

Question 1

What type of ball bearing is designed to take a radial and axial load but only from one direction?

Answer 1

Combination, angular contact bearing.

Question 2

Define oil groove.

Answer 2

One of the best methods for providing film lubrication to friction bearings not fed under constant oil pressure.

Question 3

Define synthetic bearings

Answer 3

Any man made material in bearings i.e. Plastics and Teflon’s etc.

Question 4

What percentage area of a bearing should contain grease?

Answer 4

1/3 greases level

Question 5

Define sintered bearing?

Answer 5

A brass or bronze bearing, a poured powdered metal.

Question 6

What is the advantage of tapered roller bearings?

Answer 6

They can handle high radial and thrust loads .

Question 7

Define anti-friction bearing?

Answer 7

Support guide and reduce friction of rotating shafts.

Question 8

Flat and v joint split bearing can handle what degree of load?

Answer 8

120 degrees

Question 9

When is a two piece inner ring bearing sometimes used?

Answer 9

To increase the radial loads.

Question 10

Describe the difference between a standard and a precision bearing.

Answer 10

Standard bearings have approximately twice the tolerances of precision bearing.

Question 11

A gib joint journal bearing can handle what degree of load?

Answer 11

300 degrees

Question 12

Define thrust load

Answer 12

It is the function of a thrust bearing to carry the thrust load from the shaft to the frame of the machine where the load can be absorbed and kept from interfering with the internal parts of the machine itself.

Question 13

Define journal bearing

Answer 13

Babbitt, poured bearing.

Question 14

Define fretting

Answer 14

Where the shaft moves in and out of the bearing.

Question 15

Explain the bearing designation 6310 SS

Answer 15

6 is the type, 3 is series, 10 is ID 10 x 5 mm = 50 mm, SS has to do with the cage,seals,shields, other modifications, and lubrication.

Question 16

what are the three classes of bearing fit

Answer 16

Press, push, and slip

Question 17

Define fluting

Answer 17

Passing the bearing through a magnetic field

Question 18

List the four types of roller bearings and give a reason why you would use such a bearing.

Answer 18

Standard,mill, staggered, and wound type.

Question 19

What is meant by bearing crush and spread and why is it important?

Answer 19

Bearing crush refers to the bearing inserts having positive contact with the bearing seat in the housing. The spread is built into the bearing so that the inserts have to be lightly pressed into position.

Question 20

Define spalling

Answer 20

Metal fatigue.

Question 21

Explain the difference between a acme rod and nut verses a ball screw.

Answer 21

Acme is a plain journal bearing, and roller elements in a ball screw is an axial thrust bearing.

Question 22

What is meant by a recirculating ball bearing?

Answer 22

The rollers recirculate, and constantly feeds itself.

Question 23

Define radial load

Answer 23

Radial loads are 90 degrees to the shafts axis.

Question 24

Define bearing

Answer 24

Support and guide

Question 25

Explain the proper way to fasten a pillow block to the shaft using eccentric locking collars.

Answer 25

Take hammer and punch and peen collar then tighten set screw

Question 26

Define false brinnelling

Answer 26

All the wear is on one side of the bearing caused by machine movement.

Question 27

Define brinnelling

Answer 27

Vibrations of the machine 360 degrees.

Question 28

Describe the 4 methods of checking journal bearing clearance.

Answer 28

Feeler, plastic gauge, lead wire, and. Dial indicator.

Question 29

What is the difference between Conrad and Full load bearings?

Answer 29

Full has max capacity radial, and Conrad has max radial and axial.

Question 30

List three indicators which tell you a bearing is failing.

Answer 30

Temp, noise, and vibration.

Question 31

What type of oil groove should be avoided?

Answer 31

Sharp or square grooved.

Question 32

What should the oil level be in a ball bearing?

Answer 32

The oil should be just below the center of the bottom rolling element.

Question 33

What temperature is recommended to heat shrink a bearing on a shaft?

Answer 33

200-230 degrees

Question 34

What does fixed and floating bearings refer to?

Answer 34

The fixed bearing the inner ring is fastened axially to the shaft and the outer ring is held axially in the housing. The floating is just held axially to the shaft.

Question 35

What does the ABEC classification tell you?

Answer 35

Tells you the grades of the annular bearing 1-9

Question 36

Name two types of seals and give three advantages or reasons why a particular seal should be used

Answer 36

Labyrinth non-contact, high speeds, hot or cold.

Contact seal inside sealing lips, garter spring,has primary and secondary seal to keep out contaminants.

Question 37

List the five methods of oil supply and describe how each work

Answer 37

Oil-ring felt washer next the bearing larger than the bearing
Oil-bath 1/3 to 1/2 of the rolling ball element gear box
Wick like a kerosene heater
Splash like a lawn mower gear box
Pressure line straight to the bearing like main bearing in auto.

Question 38

List and draw 3types of self aligning bearings.

Answer 38

Single row external,double row internal, and self aligning thrust ball bearing.