Intro to CNC

Question 1

Why do we measure?

Answer 1

To control what we produce

Question 2

What is the standard temperature for measuring?

Answer 2

68 degrees F or 20 degrees C

Question 3

Define “Dimensions”

Answer 3

Desired size of part feature

Question 4

Define “Limits”

Answer 4

Maximum and Minimum dimension tolerated

Question 5

Define “Tolerance”

Answer 5

Distance between limits

Question 6

How many Millimeters in an inch?

Answer 6

25.4

Question 7

How many teeth of a saw must be touching the part at all times?

Answer 7

3

Question 8

What is the ratio for the RPM for a Reamer in relation to the RPM for a drill of the same size?

Answer 8

0.5

Question 9

At what point should you polish a workpiece on the lathe?

Answer 9

Under no circumstances

Question 10

How are the feed rate on a lathe given as?

Answer 10

Thousandths per Revolution

Question 11

What is the name given to the width of a cut produced by a saw blade?

Answer 11

Kerf

Question 12

What is the included angle on the most commonly used countersink used for flat head machine screws in the USA?

Answer 12

82 degrees

Question 13

What is the drill point angle of a general purpose drill bit?

Answer 13

118 degrees

Question 14

Which type of gage is used with a surface plate to measure and mark off horizontal lines in precision layout work?

Answer 14

Height gage

Question 14

What is the name given to a transfer tool which can be used with an outside micrometer to measure a hole diameter?

Answer 14

Telescoping gage

Question 15

What process increases the diameter of a hole to a certain depth in order to allow a screw head or nut to be positioned flush with or below the workpiece surface?

Answer 15

Counterboring

Question 16

What process cuts a tapered opening in a hole so that a flathead screw can be installed flush with the workpiece surface?

Answer 16

Countersinking

Question 17

What is the name of the guide on the end of a counterbore that keeps it aligned in the existing hole?

Answer 17

Pilot

Question 18

What is the name of a hole that is only drilled partially through a workpiece?

Answer 18

Blind Holes

Question 19

What is the name of the V-shaped rails on the top of the lathe bed?

Answer 19

Ways

Question 20

Which part of the lathe is determined by the biggest diameter workpiece that can be mounted in the spindle without touching the ways?

Answer 20

Swing

Question 21

What kind of chucks have jaws that advance and retract simultaneously?

Answer 21

Universal

Question 22

What is the process of using a single-point cutting tool to enlarge an existing hole?

Answer 22

Boring

Question 23

Define “Crest”

Answer 23

The top of a Thread

Question 24

Define "Flank"

Answer 24

The sides of a Thread

Question 25

What are the advantages of a Ball Screw Thread?

Answer 25

Very little friction

Question 26

What is "Tapping"?

Answer 26

Creating internal threads

Question 27

Define the "Shank"

Answer 27

The part of a Drill Bit that attaches to the mount

Question 28

What makes a Taper Shank unique?

Answer 28

Its conical shape

Question 29

Define "Reaming"

Answer 29

Finishing a drilled hole

Question 30

The Drilling speed is (3.86 times X) divided by the diameter of the workpiece. What is X for Aluminum?

Answer 30

300

Question 31

The Drilling speed is (3.86 times X) divided by the diameter of the workpiece. What is X for Mild Steel?

Answer 31

100

Question 32

The Drilling speed is (3.86 times X) divided by the diameter of the workpiece. What is X for Brass?

Answer 32

200

Question 33

What is the ratio for Counterboring RPM compared to a drill of the same size?

Answer 33

2/3

Question 34

What is the ratio for Counterboring RPM compared to a drill of the same size?

Answer 34

1/2

Question 35

The Drilling speed is (3.86 times X) divided by the diameter of the workpiece. What is X for Bronze?

Answer 35

200

Question 36

The Drilling speed is (3.86 times X) divided by the diameter of the workpiece. What is X for Tool Steel?

Answer 36

50

Question 37

The Drilling speed is (3.86 times X) divided by the diameter of the workpiece. What is X for Cast Iron?

Answer 37

75

Question 38

What makes Climb Milling different from Conventional Milling?

Answer 38

The Cutter rotates in the opposite direction of the Table Feed in Climb Milling

Question 39

How much of a Mill Cutter should be in contact with a workpiece at maximum?

Answer 39

1/8 of an inch