M7 Maintenance Practices 7.3

Question 1

Are rulers used for precision work

Answer 1

No due to parallax error

Question 2

What is a radius gauge used for

Answer 2

To measure internal and external radii

Question 3

What type of pencil should not be used on titanium

Answer 3

Lead

Question 4

Why should scribe lines only be cut lines

Answer 4

Because scribe lines damage material

Question 5

What is a ball gauge used for

Answer 5

To measure the bore of a hole

Question 6

How are hammers classified

Answer 6

By type and weight with out the handle

Question 7

What is the face of the hammer

Answer 7

The hitting surface

Question 8

What is the cheek of the hammer

Answer 8

The side like the cheek

Question 9

What is a copper Hyde face hammer used for

Answer 9

Shaping metal with out marking material

Question 10

If removing a rivet what size should the pin punch be

Answer 10

Same diameter as the shank of the rivet

Question 11

What are centre punch angles

Answer 11

60° and 90°

Question 12

What is a 60° centre punch used for

Answer 12

Light work

Question 13

What is a 90° centre punch used for

Answer 13

General

Question 14

What way does a standard hack saw blades teeth face

Answer 14

Away from the handle

Question 15

What way does a junior hack saws teeth face

Answer 15

Towards the handle

Question 16

What is the offsetting of the teeth of a hack saw blade called

Answer 16

The KERF and is used to prevent jamming during use

Question 17

How many teeth do corse hack saw blades have

Answer 17

14 tpi and used for cutting sort material

Question 18

How many teeth do medium hack saw blades have

Answer 18

22 teeth

Question 19

How many teeth do fine hack saw blades have

Answer 19

32 teeth and used for cutting hard material

Question 20

How many teeth should be in contact with work at all times

Answer 20

2

Question 21

What type of work would a single cut file be used for

Answer 21

Soft material

Question 22

What type of work would a double cut file be used for

Answer 22

General

Question 23

What type of work would a dreadnaught file be used for

Answer 23

Heavy work

Question 24

What type of work would a rasp file be used for

Answer 24

Wood/leather or soft material

Question 25

Why is draw filing used

Answer 25

To obtain a very fine finish

Question 26

What is the point of a drill

Answer 26

The lip or cutting edge

Question 27

What is the land of a drill

Answer 27

Plain point between flutes

Question 28

What is the shank of a drill

Answer 28

The portion that goes into the chuck and where all information is kept

Question 29

What drills are most common

Answer 29

Jobber drills

Question 30

What type of drills are used in areas with limited access

Answer 30

Extension drills and they should always be used with a guard

Question 31

What is the standard lip angle of a drill

Answer 31

59° or 118° inclusive

Question 32

For drills over 3” diameter what should drill speed be limited to

Answer 32

6000rpm

Question 33

When should flat offset or port chop drill be used

Answer 33

Hard to reach area

Question 34

When tightening a drill in a chuck how many holes at least should be tightened

Answer 34

At least 2

Question 35

Why is de burring used

Answer 35

To eliminate stress raisers

Question 36

When drilling hard material such as titanium, what rules must be followed

Answer 36

Low speed high feed

Question 37

What are “Limits”

Answer 37

The maximum and minimum permanent sizes of a component

Question 38

What is “Tolerance”

Answer 38

The difference between the maximum and the minimum

Question 39

What is a clearance fit

Answer 39

It will go straight in

Question 40

What is an interference fit

Answer 40

Pin bigger than hole

Question 41

What is transition fit

Answer 41

Can either be too big or too small

Question 42

What are the two system of fits

Answer 42

- Hole basis system - Shaft basis system

Question 43

Which of the two system of fits are preferred

Answer 43

Hole basis system

Question 44

In relation to swarf, how does a right hand reamer work

Answer 44

The same as a regular drill. The swarf comes out of the flutes backwards

Question 45

With regards to swarf, how does a left hand reamer work

Answer 45

Pushes swarf forward into the work

Question 46

What is important face to remember about reaming

Answer 46

The reamer should always be rotated in the direction of the cut even when removing the reamer from the work

Question 47

When would an expanding reamer be used

Answer 47

Only when a normal reamer of the same size is unavailable

Question 48

How are metric and imperial reamers graded

Answer 48

Metric - 1:50 Imperial - 1:48

Question 49

What is important to remember about the metric reamer

Answer 49

Size written on the shank but refers to the smallest part of the taper

Question 50

What is important to remember about the imperial reamer

Answer 50

Details written on the shank but refers to the largest diameter of the taper

Question 51

What is the regular countersink size

Answer 51

100°

Question 52

Why is countersinking used

Answer 52

For aerodynamic smoothness

Question 53

What is the disadvantage of the plain and pilot countersink tool

Answer 53

No depth guidance

Question 54

What is the preferred method of countersinking

Answer 54

By using a micro stop

Question 55

What are UNF threads

Answer 55

60°

Question 56

What are BA threads

Answer 56

47.5°

Question 57

Anything below 1/4” given numbers 0-12

Question 58

How are screws threads per inch measured

Answer 58

A screw pitch gauge

Question 59

When cutting rods or dowels to fit into a hole should it be cut to major or minor diameter of the thread

Answer 59

Major

Question 60

How many types of tap are normally made for each size

Answer 60

3 Taper tap Second tap Plug tap

Question 61

What’s the disadvantage of the deflecting beam torque wrench

Answer 61

Parallax error - can’t really see the torque

Question 62

What is the equation for scale reading

Answer 62

Specific torque x L LxA

Question 63

When are pre loaded indicating torque washers used

Answer 63

Restricted access, they are also supplied in different collars

Question 64

What is the lead of a metric micrometer

Answer 64

0.5mm one complete rotation

Question 65

What is the lead of an imperial micrometer

Answer 65

1/10” one complete rotation

Question 66

Why should you never use the side of an abrasive wheel

Answer 66

To prevent weakening

Question 67

When setting up a tool holder on an abrasive wheel, how big should the gap be between the tool and the wheel

Answer 67

As small as possible

Question 68

Why is lubrication generally used

Answer 68

- To prevent heat build up - improve efficiency - prolong component life

Question 69

When is a milivolt drop test carried out

Answer 69

To measure resistance in a poor connection or loose terminal