Midterm

Question 1

1. The First thing when operating a machine tool is to determine how you will stop it prior to turning it on.

Answer 1

True

Question 2

A lathe

Answer 2

Rotates the part and the tool is fixed in the tool post and tool holder

Question 3

The spindle has to turn in the counter clockwise direction for a chip to be created on the lathe (looking from the tail stock end)

Answer 3

True

Question 4

Facing on the lathe removes material from

Answer 4

the ends of the stock

Question 5

The RPM that I recommended in the video for facing the ¾” stock was

Answer 5

600 RPM

Question 6

Turning removes material from

Answer 6

the diameter of the stock

Question 7

The Depth of cut that I recommended for both turning and facing was

Answer 7

.020 to .025 thousandths of an inch

Question 8

_______________is the distance the tool travels during one revolution of the part in Inches per revolution

Answer 8

Feed

Question 9

Which of the following cutting tool material will you choose for high productivity turning application on steel _______________

Answer 9

Carbide

Question 10

Carbide inserts have low hardness compared to high speed steel

Answer 10

False

Question 11

The cutting tool used in the lathe videos was made of carbide material

Answer 11

True

Question 12

For chamfering on the late we utilized the compound slide

Answer 12

True

Question 13

The tailstock on the lathe spins the drill chuck (Jacobs chuck)

Answer 13

False

Question 14

We used the live center in the tailstock to

Answer 14

Support the part during the turning process

Question 15

We used rough passes to

Answer 15

Remove material from our part rapidly to save time

Question 16

We used finish passes on the lathe to

Answer 16

Create smooth surfaces that we can measure to

Question 17

An example of a single point cutting tool is a Lathe turning tool.

Answer 17

True

Question 18

We used the process turning to change the diameter from ¾” down to ½”

Answer 18

True

Question 19

The lathe used in the video was an example of an engine lathe

Answer 19

True

Question 20

The measurement .100 is best communicated to a machinist as

Answer 20

One hundred thousandths of an inch

Question 21

The measurement ½” is best communicated to a machinist as

Answer 21

A half inch

Question 22

Layout die or Bluing is used in machining to

Answer 22

Create a contrast so you can see scribed layout lines easier

Question 23

We would use a height gauge to

Answer 23

Accurately scribe reference lines on our part

Question 24

Micrometer, dial caliper, steel rule etc are used to make

Answer 24

Linear measurement

Question 25

A Profilometer is used to measure

Answer 25

Surface finish

Question 26

To drill larger holes in metal stock (3/8” or larger) a ______________ is typicality drilled first.

Answer 26

Pilot hole

Question 27

The action of retracing the drill to clear chips is

Answer 27

Pecking

Question 28

The process of cutting internal threads is

Answer 28

Tapping

Question 29

What are the advantages of using cutting fluids while machining?

Answer 29

1. Reduce friction 2. Remove chips 3. Act as a coolant

Question 30

We utilize a start hole in machining to help keep the drill bit from bending, which could allow the position or location to be off the center line of the spindle

Answer 30

True

Question 31

_________ is the most commonly used cutting tool for drilling

Answer 31

Twist drill

Question 32

In a drill bit _______________ serves as pathways for chips to escape

Answer 32

Flute

Question 33

In a drill, the portion of the body between margin and flutes is undercut (often refereed as body clearance) to __________________

Answer 33

Reduce friction

Question 34

Drill size are designated as

Answer 34

1. Letter drill 2. Number drills 3. Fractional drills

Question 35

Which of the following can be used to create a start hole in a work piece

Answer 35

1. Center drill 2. Spot drill 3. Center punch

Question 36

Table top cheap drill presses typically run faster RPM then larger machines

Answer 36

True

Question 37

Roughing removes material faster than Finishing

Answer 37

True

Question 38

BUE occurs when the work piece material welds itself to the cutting tool

Answer 38

True

Question 39

Cutting speed is measured in Surface Feet Per Minute

Answer 39

True

Question 40

Feed rate is measured in Inches Per revolution

Answer 40

True

Question 41

The type of cutting tool material used for turning in the lab (shown on lecture video) and was gold in color

Answer 41

Coated carbide

Question 42

The gold color coating on the coated carbide tool is

Answer 42

Titanium nitride

Question 43

One of the tradeoffs we have to choose while selecting cutting tool material is between hardness and toughness. When cutting tool material hardness increases

Answer 43

Toughness decreases

Question 44

Hardest natural cutting material available on earth is

Answer 44

Diamond

Question 45

A built up edge occurs:

Answer 45

When work materials welds to cutting edge

Question 46

Common type of tool wear which affect tool geometry

Answer 46

Crater wear AND Flank wear

Question 47

___________indicates the distance the work moves past the cutting tool and is expressed in sfpm.

Answer 47

Cutting Speed

Question 48

___________is the distance the tool travels during one revolution of the part in Inches per revolution

Answer 48

Feed

Question 49

Which of the following cutting tool material will you choose for high productivity turning application on steel ______________

Answer 49

Carbide

Question 50

Carbide inserts have low hardness compared to high speed steel

Answer 50

False

Question 51

Carbide inserts can be used at higher cutting speeds compared to high speed steel

Answer 51

True

Question 52

PCD refers to_____________________________ in cutting tool materials (three words)

Answer 52

Poly Crystalline Diamond

Question 53

One advantage of coating carbide insert with Titanium nitride?

Answer 53

Improved lubricity

Question 53

Which material is the next lower to diamond in hardness?

Answer 53

CBN

Question 54

The term red hot hardness refers to

Answer 54

Ability to hold cutting edge shape at higher temperature

Question 55

A chip breaker is generally not necessary when machining cast iron on a lathe.

Answer 55

True

Question 56

An example of a single point cutting tool is a Lathe turning tool.

Answer 56

True

Question 57

An example of a multiple cutting edge cutting tool is a 4 flute end mill.

Answer 57

True

Question 58

The lathe turning tool shown in the video had a negative rake because of the tool holder. The carbide insert actually had a 0 degree rake

Answer 58

True

Question 58

Drill bits or twist drills are often made from High Speed Steel (HSS) material.

Answer 58

True