Millwright Theory Final

Question 0

What is a transfer punch used for?

Answer 0

Transferring bolt hole locations between to mating parts

Question 1

What is the included angle on

A centre punch

A prick punch

Answer 1

90% on a Center punch

30 - 60 % on a Prick punch

Question 2

Whats a beam type torque wrench good for?

Answer 2

They are useful for measuring rotating torques and preloads.

Question 3

Name three types of torque wrenches?

Answer 3

Beam type

Dial type

Click type

Question 4

What type of filing is used to remove large amounts of material?

Answer 4

Cross filing method

Question 5

What type of filing method is used to produce a smooth finish?

Answer 5

Draw filing

Question 6

What’s the most common type of abrasive used on a grinding wheel?

Answer 6

Aluminum oxide

Question 7

What is the purpose of lapping?

Answer 7

To produce exceptionally true surfaces and accurate dimensions - it is also used for minute reductions in size. Small amounts of approx. 0.0005 inch

Also to produce a sealing surface without use of a gasket.

Question 8

Two types of lapping surfaces plate?

Answer 8

Roughing or blocking

Finishing lapping

Question 9

Why are serial taps used for?

Answer 9

Serial taps are used to cut difficult-to-tap materials by hand.

Question 10

How do you find a tap drill size without a chart?

3/8 - 16 UNC 2B

Answer 10

TDS = MD - 1/N

TDS = 3/8 - I/ 16

MD - major Dia

N - number of threads per inch.

Question 11

Name the three types of thread die’s

Answer 11

Adjustable split die

Adjustable screw die

Solid die

Question 12

What are the three dies used for ??

Answer 12

Solid dies are used specifically for chasing.

Adjustable screw dies are used for taking progressive depths of cut to produce a thread.

Adjustable split dies are used in a die stock. The die stock is used to turn the die when cutting the thread.

Question 13

What is the advantage of a spiral reamer?

Answer 13

They can be used in bores with keyways

Question 14

The selection of a grinding wheel depends on what?

Answer 14

Material being ground
RPM of the grinding machine Spindle
Material removal rate
Required finish

Question 15

How do you tell the grade of a grinding wheel

Answer 15

Abrasive type, grit size, grade, struture, bond type, norton symbol.

Soft - (A-H)

Medium - (I-P)

Hard - (Q-Z)

8,8,10

Question 16

How does 1-15 with regards to chip clearance work?

Answer 16

15 has more clearance than 1

Question 17

What are the settings for a grinding machine.

Answer 17

Tool rest and wheel gap = 1/16

Gap between the tool rest and face of the wheel must not exceed 1/8

The gap between the spark guard and periphery of the wheel should be between 1/16 - 1/4

Question 18

What’s a kerf?

What is set?

Answer 18

Kerf is the width of cut

Set is the bend of the teeth.

Question 19

Name the three types of blade sets

Answer 19

Raker, wavy, and straight.

Raker - most common!!! Used for general purpose and leaves a good finish.

Wavy - good for thin or tubular work pieces.

Strength - doesn’t leave a good surface finish but cute faster.

Question 20

How is power of load identified on an explosive actuated tool.

and Colour

Answer 20

The three primary calibers are
.22 .25 .27

Brown
Grey
Green 
Yellow
Red
Purple

Question 21

Long power loads are useful for what?

Answer 21

Tools specific for heavy-duty applications.

Question 22

What’s the purpose of the plastic tip on the diameter of the fasteners

Answer 22

To protect the threads and to provide guidance.

Question 23

Name the three faster types

Answer 23

Drive pins

Thread studs

Drive pin assemblies

Question 24

How far should fasteners be spaced in concrete

Answer 24

3 inches apart from the edge and from each other.

Question 25

What does load strength indicate?

Answer 25

Load strength is defined as a measure of ability

Question 26

Metric and imperial threads - what’s H and h in terms of internal ad external?

What’s 2b in reference to class and internal/external

Answer 26

(h) is external, (H) is the internal

2 is class (general application) B is external

Class 3 is precision fit.

Question 27

Whats the difference between thread cutting and thread forming.??

Answer 27

Thread cutting removes material

Thread forming bends and reforms material.

Question 28

How do you calculate 10% loss on a 4:1 torque multiplayer

Answer 28

If the recommended torque for a bolt is 400ft lb divide by 3.6

Question 29

When fastening to steel how far apart should your spacing be?

Answer 29

A general recommendation is to drive fasters 15mm (1/2” inch) from the edge and 50mm (2.0” inches) apart