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Machinist Period 4 2019 Cash > Metrology 150404a 150404b 150404c > Flashcards

Metrology 150404a 150404b 150404c Flashcards

1
Q

The total deviation from basic size is called,

A

Tolerance

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2
Q

The difference between the upper limit of a shaft and the lower limit of a whole is called,

A

Allowance

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3
Q

Largest and smallest permissible size of a dimension is called,

A

Limits of size

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4
Q

The dimension from which the limits of size are derived by the application of Tolerance is called,

A

Basic size

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5
Q

The type of fit resulting when the limits given to the meeting parts will permit either an interference or a clearance fit is called

A

Transition fit

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6
Q

The most common system of limits and fits in North America.

A

Hole basis system

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7
Q

The size used for reference purposes is

A

Nominal size

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8
Q

The class of fit of those listed below that has the largest tolerance

Rc2
Rc4
Rc6
RC8

A

RC8

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9
Q

Which grade of Gage blocks is used for the shop floor inspections and set up?

A

Grade A S - 1

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10
Q

If producing a hole with a diameter of 2.5 in plus or minus 2 thou what would be the limits of size for a no-go plug gauge class y?

A

2.502 - 2.50188

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11
Q

To accurately position a workpiece in a repeatable manner using the 3-2-1 rule how many datum points are required?

A

6

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12
Q

Which tools are used as a reference to calibrate a ring gauge?

A

Gauge blocks and precision rollers

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13
Q

Quality control can be broken into which two groups?

A

Measuring and gauging

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14
Q

Three grades of Gage blocks and their applications

A

Grade 0 inspection standard
Grade AS-1 used in shops for parts set up and inspection
Grade AS2 shops looking for cheaper Gage blocks with tolerance is higher than AS1

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15
Q

Why use wear blocks?

A

Protect your gauge blocks from damage and abrasion

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16
Q

What materials are Gage Blocks made from?

A

Hardened steel ceramic and carbide

Hardened steel is cheapest ceramic and carbide last longer but cost more

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17
Q

Define limits of size

A

Maximum and minimum the sizes are allowed specified on the print. Don’t have to calculate, use sizes on the drawing.

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18
Q

Define fit

A

How the meeting parts fit together either clearance interference or transition

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19
Q

Define tolerance

A

Permitted variation in a part size the difference between the upper and lower limits of size the total amount size is permitted to vary

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20
Q

Define allowance

A

Intentional difference in size of mating Parts at their MMC. To calculate, subtract largest shaft from smallest hole

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21
Q

Define datum

A

Where most points are measured from the zero point

22
Q

Define datum simulator

A

Simulated datum is established from a design datum

23
Q

Two types of error in micrometre threads?

A

Periodic error and Progressive error

24
Q

Two types of error in dial indicators?

A

Repetition error and Progressive error

25
Q

Types of dial indicators?

A

Type a standard
Type b perpendicular
Type c Universal

Dials are meant for repeatability not accuracy

26
Q

Define roughness width cutoff

A

Greatest spaces between adjacent grooves when measuring roughness height

27
Q

Difference between waviness and roughness?

A

Widely spaced marks caused by vibration and chatter, heat treatment, and deflection

Closely spaced marks caused by the cutting tool

28
Q

The difference between balanced and continuous reading dial indicators?

A

Continuous are numbered one through 360 degrees, balanced reads in both directions from zero

29
Q

Three types of precision squares?

A

Blade (try square), cylinder, block.

30
Q

Name to master squares

A

Cylinder and block, AA grade

31
Q

What is the 3-2-1 rule?

A

Restricting and securing peace in three axes in One Direction

32
Q

Two types of air gauges?

A

Column, pressure

33
Q

What are the 7 parts of a dial indicator?

A 
Contact point 
 Spindle
 Rack Spring
 Rack
 Hair spring
 Bezel 
 Gear train
34
Q

What are the two types of optical comparators?

A

Shadowgraph, gears in a watch

Mechanical Optical, Reed type

35
Q

What is the advantage of using a fixed gauge for inspection instead of a micrometre?

A

You eliminate the stupidity of the operator.

36
Q

How does comparison measurement differ from other types of measurement?

A

Comparison determines how much the actual size of a part differs from the size of a standard

37
Q

What is the difference between a continuous reading dial indicator and the universal dial test indicator?

A

Continuous reads from 0 to 360 degrees, Universal reads both directions from zero

38
Q

An air gauge uses air pressure to compare the diameter of a bore with what?

A

Master Ring gauge

39
Q

What is a micro inch? Micrometre?

A

.000001

.0000001

40
Q

What is lay?

A

The direction of the roughness pattern

41
Q

What is Centerline average?

A

The average height of the Peaks and valleys on the surface pattern

42
Q

What is the term for the joining of Gage blocks?

A

Wringing

43
Q

What takes the backlash out of the gear train on a dial indicator?

A

A hair spring

44
Q

What is the most common contact point for dial indicators?

A

The half sphere

45
Q

What would you use to measure the included angle of a high speed steel lathe tool for cutting an Acme thread, 29.5 degrees?

A

A protractor screen

46
Q

What is an optical flat used for?

A

Flatness, parallelism, and size

47
Q

What do you call the patterns of dark bands stretching across the optical flat?

A

Fringe patterns

48
Q

What do you call the pattern of Shadows that the coordinate measuring system relies on?

A

Moire Fringe

49
Q

What three abbreviations are Centerline average known as?

A

CLA, Ra, AA

50
Q

What are the two ways of checking for lack of flatness or parallelism on a micrometres anvils?

A

An optical flat or a Precision ball

51
Q

What is the result of an incorrectly set up coordinate system?

A

Provides defective measurements.

Machinist Period 4 2019 Cash (24 decks)

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