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CNC Machinist > Intro to CNC > Flashcards

Intro to CNC Flashcards

Learn the basics

1
Q

Why do we measure?

A

To control what we produce

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2
Q

What is the standard temperature for measuring?

A

68 degrees F or 20 degrees C

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3
Q

Define “Dimensions”

A

Desired size of part feature

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4
Q

Define “Limits”

A

Maximum and Minimum dimension tolerated

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5
Q

Define “Tolerance”

A

Distance between limits

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6
Q

How many Millimeters in an inch?

A

25.4

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7
Q

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

A

3

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8
Q

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

A

0.5

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9
Q

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

A

Under no circumstances

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10
Q

How are the feed rate on a lathe given as?

A

Thousandths per Revolution

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11
Q

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

A

Kerf

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12
Q

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

A

82 degrees

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13
Q

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

A

118 degrees

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14
Q

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

A

Height gage

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14
Q

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

A

Telescoping gage

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15
Q

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?

A

Counterboring

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16
Q

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

A

Countersinking

17
Q

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

A

Pilot

18
Q

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

A

Blind Holes

19
Q

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

A

Ways

20
Q

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

A

Swing

21
Q

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

A

Universal

22
Q

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

A

Boring

23
Q

Define “Crest”

A

The top of a Thread

24
Q

Define “Flank”

A

The sides of a Thread

25
Q

What are the advantages of a Ball Screw Thread?

A

Very little friction

26
Q

What is “Tapping”?

A

Creating internal threads

27
Q

Define the “Shank”

A

The part of a Drill Bit that attaches to the mount

28
Q

What makes a Taper Shank unique?

A

Its conical shape

29
Q

Define “Reaming”

A

Finishing a drilled hole

30
Q

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

A

300

31
Q

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

A

100

32
Q

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

A

200

33
Q

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

A

2/3

34
Q

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

A

1/2

35
Q

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

A

200

36
Q

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

A

50

37
Q

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

A

75

38
Q

What makes Climb Milling different from Conventional Milling?

A

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

39
Q

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

A

1/8 of an inch

CNC Machinist (3 decks)

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