Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

EGAD Final > GD&T > Flashcards

GD&T Flashcards

(66 cards)

Start Studying
1
Q

Benefits of GD&T

A
  1. Uniformity of design practice
  2. Less chance of misinterpretation
  3. Promotes interchangeability of parts
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Different standards of GD&T

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

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

A

fit any assembly

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Each dimension has a:

A

tolerance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Dimensioning and tolerancing shall be

A

complete

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Every dimension of a product shall be shown:

A

no more and no less

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Dimensions are slected and arranged to suit the:

A

function and mating relationship of the part

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Dimensions are slected and arranged to suit the:

A

function and mating relationship of the part

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Dimensions should not be subject to more than one:

A

interpretation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Tolerances are used for:

A

lengths, widths, diameters and locations

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Centrelines

A

derived for shafts and holes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Centrelines

A

derived for shafts and holes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Centreline locations for shafts

A

located half the measured diameter to the edge of the shaft

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Centreline location for holes

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Feature

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Datum feature

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Benefits of planning

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

CPM: activity

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
CPM: events
graphically represented as a dot; shows which activities must be completed before the event can occur
26
Precedence
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)
27
How to draw chart before determining CP:
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
Critical path
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
Earliest time forward sweep/ latest time reverse sweep
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
Critical Path and non-critical events.
Criticial path = least amount of time possible given no delays. Other events can be delayed without impacting project deadline.
31
CPM Steps
List all activities and expected durations, determine precedence, construct CPM diagram, determine earliest start time and latest start time, identify CPM
32
How to read sectional views:
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
Where to hatch
every object the cutting plane touches (not holes); hatch what touches the glass
34
uneven slicing planes
do not show corners of slicing plane
35
linetype for cross-sectioning
phantom linetype
36
hatching two adjacent pieces
different spacing, different directions
37
hatching three adjacent pieces
different directions
38
hatching lines
must be non-parallel to all edges; even spacing
39
revolved cutting planes
show holes and features at radial distance: the distance it would be at if it were revolved
40
cross-sectioning with ribs
omit hatching the rib (as if the plane were just before the ribs
41
hidden lines and cross-sectioning
hidden lines beyond cutting plane not usually shown unless needed for clarity
42
Setting tolerances
+/- 0.005 OR +0.3/-0.1 OR 5.7/5.6
43
Minimum clearance for mating parts
The smallest female part - the largest male part
44
Maximum clearance for mating parts
The largest female part - the smallest male part
45
Three standard fits between shafts and holes
clearance, transitional, interference
46
Clearance fit
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
Interference fit
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
Transition fit
Can either be a clearance or interference fit for securely locating parts in an assembly while allowing disassembly.
49
How to denote screw threads
internal: leave a notch in inner circle; external: leave a notch in outer circle
50
fully defined
new definitions cannot be applied to a skecth without conflicting with those already existing
51
types of relations
horizontal, vertical, parallel, perpendicular, parallel, collinear, coincident, merge, intersection, concentric, tangent
52
Maximum material condition
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
Least material condition
LMC or L: shafts- at min diameter, holes - at max diameter
54
What happens in terms of tolerance of the shaft as a hole departs from MMC
More tolerance is allowed
55
Features of size
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
GD&T: Form
Straightness, flatness, circularity, cylindricity
57
GD&T: Orientation
Angularity, perpendicularity, parallelism
58
GD&T: Location
Position, concentricity, symmetry
59
Object line weight
heavy: 0.6mm
60
hidden line weight
medium : 0.3mm
61
center line weight
thin: 0.05mm
62
dimension and extennsion line weight
thin: 0.05mm
63
hatch line weight
thin: 0.05mm
64
phantom line weight
thin: 0.05mm
65
dimension line spacing
10mm from object and 6mm from eachother
66
crossing dim lines
never

EGAD Final (1 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions