MecE265 > Week 4 > Flashcards

Week 4 Flashcards

(60 cards)

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1
Q

kerf

A

the width of material removed by a cutting process. it is a void left behind. the slot created by the tool

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2
Q

2 examples of high kerf

A

mechanical sawing/band machining

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3
Q

2 examples of low kerf

A

laser / EDM

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4
Q

Process of mechanical kerf: sawing

A

physicaly teeth tear through material

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5
Q

characteristics of mechanical kerf: sawing

A

used for roughing out shapes

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6
Q

results of mechanical kerf: sawing

A

wide kerf, lower precision, rough finish

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7
Q

another name for vaporization

A

laser

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8
Q

another name for EDM

A

erosion

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9
Q

In Laser/EDM process, kerf is determined by? and removed by what?

A

the beam focus or wire diameter.
by vaporization or erosion

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10
Q

is kerf constant or variable

A

variable

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11
Q

What affects kerf width

A

vibration (waviness) and friction (roughness)

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12
Q

offset

A

you cannot cut on the line. to maintain dimensional accuracy, the tool path must by offset by exactly half the kerf width

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13
Q

how wide must you make the offset

A

half the kerf width

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14
Q

roughing

A

high kerf processes

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15
Q

net shape

A

low kerf processes get you the final dimension

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16
Q

advantage of section view (2)

A

more clear in displaying the interior shape of the object

eliminates hidden lines

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17
Q

should you show hidden lines in a section view

A

no

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18
Q

should you show center lines in a section view

A

yes

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19
Q

full section

A

cutting plane goes completely through the object

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20
Q

half section

A

go halfway through the object

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21
Q

offset and aligned section cutting plane

A

be bent to go through featurs of interest

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22
Q

broken-out

A

go through part of the object

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23
Q

which has precendence, cutting plane (section) lines or centerlines

A

cutting plane lines

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24
Q

can you create multiple section views on a single object

A

yes. justs label the section lines as different letters

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25
how do you determine cross-hatching line direction
- avoid aligning the cross hatching with other drawing lines - typically done at 45 degree angle. but can be changed for adjacent parts
26
spacing of hatch lines should be?
1.5 - 3 mm
27
where do you place the full section view
the same direction in the multi-view drawing that the normal view would occupy
28
what do you include and not include on a half section view of a drawing
1. do not include hidden lines on either side 2. external features are drawn on the un-sectioned half of the view 3. a centerline (not a object line) is used to seperate the sectioned half from the un-sectioned half of the view
29
how many arrows are included on a half section cutting line
1 arrow. (the plane is bent at 90 degrees)
30
when do we typically use half section view
parts that are symmetrical (cylinders) or when we need external features to be shown
31
offset section
the cutting plane has been bent at one or more 90 degree angles to pass through important features
32
when do we use offset sections
complex parts that have a number of important features that cannot be sectioned using a straight cutting plane
33
how do you show where the cutting plane depth changes on an offset section in the section view
you don't. Do Not draw lines to show it.
34
broken-out section
used when only a portion of of the object needs to be shown in section. cutting plane is free-form and usually not labelled
35
do you label a broken out section in the multiview?
nope
36
revovled section
you cut so that the plane is into the plane, then rotate that image by 90 degrees so the plane is parallel to the page made by revoliving a cross-section 90 degrees and superimposing on an orthographic view
37
how do we indicate a revoved section
special revolved section line or broken view. arrows connecting the cutting plane section lines to a center line to indicate the rotation
38
when do we use revolved section
elongated features such as spokes wings beams and girders
39
when do we use removed section
when there is not enough room on the orthographic view for a revoled section
40
revolved section vs removed section
same view and cross section. Revolved has the image captured by the cutting plane in line with the rest of the drawing removed has the image captured by the cutting plane next to the drawing
41
5 rules for removed section
1. do not follow standard view alignments 2. can be a different drawing scale than parent view 3. labeling cutting plane lines are very important 4. good for showing details at larger scales 5. frequently, the removed section is drawn to an enlarged scale for clarification and easier dimensioning
42
multiple removed sections
do not follow stanndard view alidgnments can be at a different drawing scale than parent
43
webs and spokes section standards
thin sections that are cut by the cutting plane are not hatched
44
how do we determine if something is a web or spoke + why does this matter
thin compared to its height/length Its main job is stiffening or supporting, not being a bulky solid It looks like a wall, fin, rib, or spoke you do not use hatching on them
45
rule for voids in sectional views for webs and spokes
you outline the spoke or web's void in the shape of the object but you do not cross hatch.
46
aligned section
start at point in centre and extend lines out at different angles. ie, 30 degrees from each other
47
what kind of section do we typically use in assemblies
full or half
48
hatching rules for standard parts on the cutting plane
they're not hatched
49
line pattern for section view
long, short, long
50
auxillary views purpose
show surfaces as true shape
50
rule for hatching adjacent parts in assemblies
must have different hatch patterns
51
true shape + why do we use it
actual shape and size of a feature — not distorted by perspective or projection. inclined and oblique surfaces do not appear true shape in any normal orthogonal view. they are foreshortened
52
auxillary view
an additional view of an object from a different viewpoint to clarify shape look at object (your line of site) is at an angle (often 45 degrees) between right side view and top view used when standard views wont allow dimensioning
53
what makes an orthographic view true shape
line of sight is normal to surface of interest
54
two types of auxillary views
inclined surfaces (primary or first auxillary) oblique surfaces (second auxillary)
55
can you have more than one auxilliary view
yes
56
full auxiliary view
shows the entire object not usually necessary or desirable since it makes the view hard to understand and it contains a lot of information that is irrelevant for what the view is trying to achieve
57
partial auxiliary view + dimension rules
shows ONLY the surface of interest. what you typically used. dimension true shape features in auxiliary view
58
does full auxiliary view show hidden lines
yes
59
does partial auxiliary view show hidden lines
no
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