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EGAD Final > GD&T > Flashcards

GD&T Flashcards

1
Q

Benefits of GD&T

A
  1. Uniformity of design practice
  2. Less chance of misinterpretation
  3. Promotes interchangeability of parts
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2
Q

Different standards of GD&T

A

American National Standards Institute (ANSI); American Society for Mechanical Engineers (ASME); International Standards Organization (ISO)

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3
Q

In mass manufacturing, parts are required to be designed with some tolerance so they will:

A

fit any assembly

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4
Q

Each dimension has a:

A

tolerance

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5
Q

Dimensioning and tolerancing shall be

A

complete

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6
Q

Every dimension of a product shall be shown:

A

no more and no less

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7
Q

Dimensions are slected and arranged to suit the:

A

function and mating relationship of the part

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8
Q

Dimensions are slected and arranged to suit the:

A

function and mating relationship of the part

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9
Q

Dimensions should not be subject to more than one:

A

interpretation

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10
Q

Tolerances are used for:

A

lengths, widths, diameters and locations

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11
Q

What type of hole deviations are allowed for using just location tolerance for a through hole?

A

Several deviations from a perfect hole through the plate, all within the range of tolerance (the hole could be bent or at an angle that is not perpendicular)

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12
Q

Datum definition and what they can be

A

A datum is a reference locations for a dimension. A datum can be: a point, a centre line, or a plane. Note: these are virtual positions, not real positions.

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13
Q

Centrelines

A

derived for shafts and holes

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14
Q

Centrelines

A

derived for shafts and holes

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15
Q

Centreline locations for shafts

A

located half the measured diameter to the edge of the shaft

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16
Q

Centreline location for holes

A

the centreline is derived from the largest size pin that will fit into the hole (the ID)

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17
Q

Feature

A

a general term applied to a physical portion of a part (eg. a surface or a hole)

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18
Q

Datum feature

A

a feature of a part that contacts a datum (real, but datum is virtual)

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19
Q

Datum planes

A

If a part has an irregular surface, many different measurements are possible. Using a datum place (place irregular part on a flat plane) makes for a more accurate measruement.

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20
Q

Benefits of planning

A

Provides communication framework, helps allocate resources, provides benchmark for progress

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21
Q

Challenges of planning

A

realistic estimates of how long it will take and how long, how much effort/detail to put into planning

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22
Q

Gantt Chart

A

List of project activities, chronological time scale of activities; can include milestones (indicated by arrows); can include progress (indicated by bars)

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23
Q

Limitations of Gantt charts

A

Activity sequence (if one activity can start before another ends) is not obvious), no clear way of adjusting start-times to compensate for delays

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24
Q

CPM: activity

A

Any process; graphical representation is line with name (letter) above and duration below

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25
Q

CPM: events

A

graphically represented as a dot; shows which activities must be completed before the event can occur

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26
Q

Precedence

A

Graphically represented as all activities that come into an event; chart represented as ‘precedenc’ (eg. Acitvity : E | Precedence : D means D must happen before E)

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27
Q

How to draw chart before determining CP:

A

All events that have nothing preceding them begin at project start; all activities that don’t precede anything go to project end; all activities that preced etwo things, branch out after the event. Put duration under the line!!

28
Q

Critical path

A

the path through which any delay (of any event) will delay the entire project). Normally the longest way way. Can be determined using the earliet time forward sweep and latest time reverse sweep.

29
Q

Earliest time forward sweep/ latest time reverse sweep

A

Forward sweep: from each event, find the next single activity that takes the least amount of time. The latest time reverse sweep is the same (shortest activity = latest time). The CP is the path along which the earliest and latest times are the same for all events.

30
Q

Critical Path and non-critical events.

A

Criticial path = least amount of time possible given no delays. Other events can be delayed without impacting project deadline.

31
Q

CPM Steps

A

List all activities and expected durations, determine precedence, construct CPM diagram, determine earliest start time and latest start time, identify CPM

32
Q

How to read sectional views:

A

Arrows indicate the direction of viewing, line (slicing plane) indicates where view is cut; line is dashed in the middle; put letters by arrows in normal view and lable the sectional view SECT A-A

33
Q

Where to hatch

A

every object the cutting plane touches (not holes); hatch what touches the glass

34
Q

uneven slicing planes

A

do not show corners of slicing plane

35
Q

linetype for cross-sectioning

A

phantom linetype

36
Q

hatching two adjacent pieces

A

different spacing, different directions

37
Q

hatching three adjacent pieces

A

different directions

38
Q

hatching lines

A

must be non-parallel to all edges; even spacing

39
Q

revolved cutting planes

A

show holes and features at radial distance: the distance it would be at if it were revolved

40
Q

cross-sectioning with ribs

A

omit hatching the rib (as if the plane were just before the ribs

41
Q

hidden lines and cross-sectioning

A

hidden lines beyond cutting plane not usually shown unless needed for clarity

42
Q

Setting tolerances

A

+/- 0.005 OR +0.3/-0.1 OR 5.7/5.6

43
Q

Minimum clearance for mating parts

A

The smallest female part - the largest male part

44
Q

Maximum clearance for mating parts

A

The largest female part - the smallest male part

45
Q

Three standard fits between shafts and holes

A

clearance, transitional, interference

46
Q

Clearance fit

A

the max diameter set by tolerance is always smaller than the min hole diameter (up to and including a zero clearance. Loose fit, free running fit, close running fit, sliding fit

47
Q

Interference fit

A

The minimum shaft diameter is always larger than the maximum allowed hole diameter. They eliminate the need for threads, welds or other means of joining; often assembled by hydraulic press with lubricant and heat. Locational transition fit, medium drive fit, and force fit.

48
Q

Transition fit

A

Can either be a clearance or interference fit for securely locating parts in an assembly while allowing disassembly.

49
Q

How to denote screw threads

A

internal: leave a notch in inner circle; external: leave a notch in outer circle

50
Q

fully defined

A

new definitions cannot be applied to a skecth without conflicting with those already existing

51
Q

types of relations

A

horizontal, vertical, parallel, perpendicular, parallel, collinear, coincident, merge, intersection, concentric, tangent

52
Q

Maximum material condition

A

MMC or M: shafts - at MMC when it is at the maximum diameter allowed by the tolerance, holes - at LMC when it is at minimum diameter allowed by tolerance

53
Q

Least material condition

A

LMC or L: shafts- at min diameter, holes - at max diameter

54
Q

What happens in terms of tolerance of the shaft as a hole departs from MMC

A

More tolerance is allowed

55
Q

Features of size

A

a type of feature ( a cylindrical surface, or pair of two opposed parallel surfaces, etc.) associated with a size dimension. If you can use a calliper (big side) to measure it, it is a feature of size.

56
Q

GD&T: Form

A

Straightness, flatness, circularity, cylindricity

57
Q

GD&T: Orientation

A

Angularity, perpendicularity, parallelism

58
Q

GD&T: Location

A

Position, concentricity, symmetry

59
Q

Object line weight

A

heavy: 0.6mm

60
Q

hidden line weight

A

medium : 0.3mm

61
Q

center line weight

A

thin: 0.05mm

62
Q

dimension and extennsion line weight

A

thin: 0.05mm

63
Q

hatch line weight

A

thin: 0.05mm

64
Q

phantom line weight

A

thin: 0.05mm

65
Q

dimension line spacing

A

10mm from object and 6mm from eachother

66
Q

crossing dim lines

A

never

EGAD Final (1 decks)

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