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Flashcards in TEST 1 Deck (76):
1

Feature of Size

Measure with a caliper - Regular and Irregular - Each is associated with a directly toleranced dimension - Cylinder or spherical surface, a circular element, a set of two opposed parallel elements or opposed parallel surfaces

2

Feature without Size

Surfaces

3

Special rule for form tolerances

Cannot reference Datum

4

basic dimension

shown in box; theoretically perfect; no title block tolerances apply

5

rule number 1

define size and form limits ; requires perfect form at MMC; No relation between features

AKA envelope priniciple - Taylor prinicple

6

When would a MMC modifier be used? What type of application?

Clearance Application

7

When would a LMC modifier be used? What application?

Wall thicknesses

8

When would a RFS modifier be used? What application?

Press fit/ Force fit

9

Geometric tolerance categories

Form, Orientation, Location

10

Form

Flatness, Straightness, Cicularity, Cylindricity

11

Orientation

Angularity, Parallelism, Perpendicularity

12

Location

Postition, Profile

13

How many Geometric Characteristics are there?

14 - We only use 12. Minus concetricity and symmetry.

14

What is it called when you attach GDT to a datum?

Qualify

15

Special rule for Orientation Tolerances?

Has to reference datum.

16

What is the difference between a datum feature and a datum plane?

Plane - theoretical perfect , the surface the part sits on
Feaure- the part itself

17

How many characteristic symbols are there?

14

18

how many orientation controls are there?

3 - perpendicularity, angularity, parallelism

19

what does position control?

feature of size

20

what does profile of surface control?

feature without size

21

what is a basic dimension

theoretically perfect, title box tolerances do not apply, in a square

22

what would a feature modifier of MMC be used for?

clearance holes

23

what would a feature modifier of LMC be used for?

wall thickness

24

what would a feature modifier of RFS be used for?

press fits

25

what does FCF stand for

FEATURE CONTROL FRAME

26

what does DRF stand for

DATUM REFERENCE FRAME

27

how many degrees of freedom are there?

6 - 3 translation, 3 rotation

28

Do form tolerances use Datums?

NO

29

What is RMB?

Regardless of Material Boundary

30

What is datum feature simulator?

Equipment that clamps onto part. (Close chuck onto part)

31

What is mating envelope?

The mating envelope is a perfect form check. Checking at perfect form at MMC. Prefixed.(Leave chuck at same size - MMC - and slide part in)

32

What is the datum itself?

The axis - Theoretically perfect

33

What is the datum feature?

The surface of the part.

34

local size

spherical cross section check

35

mating envelope

perfect form envelope at mmc check

36

What is the American standard for GD&T?

ASME y14.5 - 2009

37

Identify different types of fits

If internal feature dimension is bigger than external feature dimension it is a clearance fit - vice versa for interference fit

38

What is the implied perpendicularity tolerance of two concentric cylinders with different diameters?

NONE - APPLY RULE NUMBER 1 - NO RELATIONSHIPS BETWEEN FEATURES

39

What does position control?

Features of Size

40

What does Profile of a surface control?

Features without size

41

What is the shape of the flatness tolerance zone?

2 parallel planes

42

What is the shape of a cylinder or hole (feature with diameter symbol) tolerance zone?

Axis

43

What is the shape of profile of a surface tolerance zone?

Uniform 3D boundary

44

Calculate the allowance

MMC of hole - MMC of shaft
MMC of internal feature - MMC of external feature

45

Define allowance

The tightest fit between mating parts

46

Define clearance

The loosest fit between mating parts

47

Calculate clearance

LMC of hole - LMC of shaft
LMC of internal feature - LMC of external feature

48

Calculate virtual size

MMC +or- Tolerance
Holes appear smaller and pins appear larger
- for hole, +for shaft

49

Calculate MMB

MMC +or- Tolerance
Holes appear smaller and pins appear larger
- for hole, +for shaft

50

Calculate allowed position

Actual size - MMC + Tolerance

51

What is the first step to creating a DRF?

Largest mating surface

52

Datum Symbol

The letter with the box and the line and the triangle

53

Datum feature

The part itself

54

Datum feature simulator

Inspection equipment - Surface plate , chuck, cmm, gage pin

55

Simulated datum

Based off DFS - actual physical equipment - top of surface plate - axis of chuck

56

What are the six degree of freedom?

XYZ, UVW

57

What are the 3 datum targets?

Area shown as a shape or X , Line shown as a phantom line or X , Point shown as an X or X

58

What are datum target symbols used for? What type of part?

Organic surfaces , casting

59

What are the three tolerance zone shapes we have learned thus far?

2 parallel planes, Cylinder, 3d Uniform Boundary

60

What is the benefit of using profile of a surface over a flatness control?

CoPlanar control

61

PROFILE OF A SURFACE

LOCATION - 3D UNIFORM BOUNDARY

62

POSITION

LOCATION - 2 PARALLEL PLANES OR CYLINDER

63

STRAIGHTNESS (FEATURE OF SIZE)

FORM - CYLINDER

64

SYMMETRY

LOCATION - 2 PARALLEL PLANES

65

CIRCULAR RUNOUT

LOCATION - 2 CONCENTRIC CIRCLES

66

PARALLELISM

ORIENTATION - 2 PARALLEL PLANES OR CYLINDER

67

CIRCULARITY

FORM - 2 CONCENTRIC CIRCLES

68

ANGULARITY

ORIENTATION - 2 PARALLEL PLANES OR CYLINDER

69

STRAIGHTNESS (SURFACE)

FORM - 2 PARALLEL LINES

70

PROFILE OF A LINE

LOCATION - 2D UNIFORM BOUNDARY

71

TOTAL RUNOUT

LOCATION - 2 PARALLEL PLANES OR 2 CONCENTRIC CYLINDERS

72

FLATNESS

FORM - 2 PARALLEL PLANES

73

CONCENTRICITY

LOCATION - CYLINDER

74

PERPENDICULARITY

ORIENTATION - 2 PARALLEL PLANES OR CYLINDER

75

CYLINDRICITY

FORM - 2 CONCENTRIC CYLINDERS

76

Position - coaxial control

Axis to axis

Controls - Orientation /location