Gears

Question 0

Enclosed your drives are contained how

Answer 0

Contained in a gearbox with lubrication supply

Question 1

Open gear drives are exposed to what and are suitable for what kind of application

Answer 1

Outside environment and are suitable for light duty applications

Question 2

What are gear sets used for

Answer 2

To be meshed together in pairs and intended to mate

Question 3

What is gear train

Answer 3

Two or more gears that mesh or mate together

Question 4

What is a pinion

Answer 4

Two gears with different number of teeth

gear with fewer amount of teeth is the pinion

Question 5

If the smaller gear is the pinion what is the larger gear in a bevel and hypoid mating gear

Answer 5

Crown gear

Question 6

What is the drive gear

Answer 6

The gear the drives the output gear

Question 7

What is the driven gear

Answer 7

Gear that is driven by the drive gear

Question 8

What Kinda drive has the same speed as the input and output

Answer 8

Direct drive

Question 9

What does a speed reducer do

Answer 9

If you have a fast input speed the output speed will be reduced
Ex
Input will have a small gear going into a big gear on the output

Question 10

Speed increaser

Is the drive gear smaller or bigger

Answer 10

Bigger

Question 11

What is an overhung gear

Answer 11

Bearing support only on one side of the gear

Question 12

What is a straddle mounted gear

Answer 12

A bearing on both sides of the gear

Question 13

Internal gears have teeth on the inside or outside of the gear plank and are they smoother or not as smooth

Answer 13

Inside

Smoother

Question 14

Compound gear train has how many shafts and how many gears

Answer 14

Three or more shafts and four or more gears

Question 15

Define end play

Answer 15

The gear or shaft can move axially

Question 16

Pre-loads have how much axial clearance for proper gear mesh

Answer 16

Zero

Question 17

What is the axis of rotation

Answer 17

Centerline around which gear or parts revolve

Question 18

What causes gear wear

Answer 18

Lack of lubrication, abrasives and bad tooth contact

Question 19

What is a floating gear or shaft

Answer 19

Where one gear or shaft is allowed to move axially to its best position kind of like bearing

Question 20

Right and left-hand gears are called what kind of angle

Answer 20

Helix angle

Question 21

How can you tell if you have a left or right hand gear

Answer 21

Which ever way the gear points away from centerline of the shaft

Question 22

Describe a worm and worm wheel gear set

Answer 22

The worm is the smaller gear and looks like a screw the worm wheel is a larger circular gear

Question 23

The clearance between gear teeth and the pitch line is called what

Answer 23

Back lash

Question 24

Top half of the gear tooth is called what

Answer 24

Addendum

Question 25

Bottom half of the gear tooth including the clearance is called what

Answer 25

Dedendum

Question 26

Total depth of the tooth top to bottom including the clearance is called what

Answer 26

Whole Depth

Question 27

Working depth includes what minus the clearance

Answer 27

Addendum + Dedendum

Question 28

What are the two best pressure angles in degrees

Answer 28

20° and 14°

Question 29

If you have a steep and smooth helix angle is this better or worse

Answer 29

Better

Question 30

If you have more starts then less starts on a worm gear box will the worm wheel move faster or slower each revolution

Answer 30

Faster | example 3 starts equals three pitches each revolution

Question 31

What is the formula to get diametral pitch

Answer 31

Number of teeth on your gear divided by pitch diameter

Question 32

List three ways to have proper gear mesh

Answer 32

Have the same diametral pitch same pressure angle and correct your hand left or right Same helix angle

Question 33

Can idlers change the speed of the input and output gear

Answer 33

No because idlers only change the direction or keep it the same

Question 34

What Kind of gears are suitable for shafts parallel to each other with no axial thrust unless misaligned (cowboy)

Answer 34

Spur gears

Question 35

Where will external spur teeth be on a gear plank

Answer 35

On the outside

Question 36

Where will the internal spur teeth be on a gear plank

Answer 36

On the inside

Question 37

What kind of gear system is on a arbor press

Answer 37

Rack and pinion

Question 38

How are single helical gears cut

Answer 38

They have the teeth cut at an angle to the shaft of the axis

Question 39

Are helical gears stronger or not stronger then spur gears

Answer 39

Stronger because they have more teeth in contact at one time

Question 40

Can helical gears be used on shafts that cross over 90° or other angles

Answer 40

Yes but the gears have to be left-hand and right-hand in order to mesh proper

Question 41

What are the most common angles for helical gears

Answer 41

7° to 23° | most industrial gears have a 20° pressure angle

Question 42

What kind of loads and speed applications are herringbone gears used for

Answer 42

High speeds and heavy loads

Question 43

What kind of gear is similar to a doublecut helical gear

Answer 43

The herringbone gears

Question 44

For bevel gears what is the most common intersection angle

Answer 44

90° | but some intersect at other angles

Question 45

Give four types of bevel gears

Answer 45

Miter straight spiral and zerol

Question 46

On gears where the shafts must intersect at 90° are called what kind of bevel gear

Answer 46

Mitre gear

Question 47

Worm bleed refers to the distance by which what

Answer 47

One tooth on the worm advances in one turn this is determined by the number of starts on the worm

Question 48

Parallel angle compound and planetary gear systems are all what kind of drives

Answer 48

Fixed speed gearbox drives

Question 49

What kind of specific combination of gears can produce several speed and torque combinations from one set of gears in a small space Ex: Sun gear, carrier with planet gears mounted to it and a ring gear

Answer 49

Planetary gear systems

Question 50

What kind of methods do you use to check for acceptable mesh patterns while being reassembled

Answer 50

Prussian blue Venetian red Black light pencil lead

Question 51

What is a good practice before using Prussian blue on your gear teeth to measure mesh patterns

Answer 51

Clean both gears very thoroughly

Question 52

What is the best tool to use to measure backlash

Answer 52

Dial indicator

Question 53

Tie rod torque arms should be mounted in a position that forms what kind of angle

Answer 53

A 90° angle