Auxiliary Views, Inclined Planes, Oblique Planes

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Unit 12

• Auxiliary Views, Inclined Planes, Oblique Planes

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Unit 12

• Auxiliary views show the true shape
• True Shape is needed for dimensioning
• Does not always create an additional view on a
  drawing
• Can be used to replace one of the principal views

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Inclined Planes

• Appears as an edge in a principal view
• True shape may be shown by projecting a view
  perpendicular to it
• Accomplished by drawing a primary auxiliary view
• Often drawn as partial views-exposing only true
  shape of inclined plane

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Inclined Planes

• Partial views may terminate with short break
  lines
• May terminate with visible lines where applicable
• May use existing visible lines where applicable

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1. What type of iron is specified for the
casting? (Do not abbreviate.)
Malleable Iron
8
2. What principal view did the auxiliary view
replace?
Right-Side View
9
3. Is the auxiliary view a partial view or is it
complete?
Partial View
10
4. What view shows the real shape of the reamed
holes?
Top View
11
5. What view shows the true height of the bosses?
Front View
12
6. What view shows the true shape and spacing of
the tapped holes?
Auxiliary View
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7. What tap drill size is specified for the
threaded holes?
.312
14
8. How many threads does each hole contain?
8
15
9. What is the total tolerance on the reamed
holes?
.0005
16
10. What would be the overall height of the
casting before machining?
1.62
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Determine the dimensions for the letter
A-Max
Max .33
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Determine the dimensions for the letter
B
60
19
Determine the dimensions for the letter
C
.70
20
Determine the dimensions for the letter
D
.65
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Determine the dimensions for the letter
E
.10
22
Determine the dimensions for the letter
F
.67
23
Determine the dimensions for the letter
G
.38
24
Determine the dimensions for the letter
H
.30
25
Determine the dimensions for the letter
I
.45
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Determine the dimensions for the letter
J
.50
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1. Is the auxiliary view a complete view or a
partial view?
Partial View
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2. Are the tapped holes true shape or elliptical
on the auxiliary view?
True Shape
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3. Would the tapped holes be round or elliptical
on the principal view?
Elliptical
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4. What is the major thread diameter of the
tapped holes?
.375
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5. What size tap drill is specified?
.312
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6. What thread series is specified?
Coarse
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7. What is the pitch of the thread? (Answer
decimally.)
.0625
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8. What class of fit may be assumed for the
threaded holes?
Class 2
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9. How many full threads will the blind hole
contain?
12
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10. What type of section is used to expose the
blind holes?
Broken Out
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11. What type of section is used to show the
radius on the rib?
Revolved
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12. How much material remains between the side of
the slotted hole and the ribs?
.4245
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13. What is the overall length of the slotted
hole?
3.531
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14. What size fasteners are intended for use in
the slotted holes?
.500
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Determine the dimension for the letter
A
1.00
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Determine the dimension for the letter
B
1.00
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Determine the dimension for the letter
C
.62
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Determine the dimension for the letter
D
1.250
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Determine the dimension for the letter
E-Max
Max 6.53
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Determine the dimension for the letter
F-Max
Max 4.025
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1. What type of sectional view is the left-side
view?
Full
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2. How many auxiliary views does the part contain?
2
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3. What is the pitch of the threads tapped into
the tee-slot? (three decimal places.)
.036
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4. Do the coarse threads require a larger or
smaller tap drill than the fine threads?
Smaller
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5. How many threads will the tapped hole in the
tee-slot contain?
7
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6. What is the MMC of the blind drilled hole
diameter?
.244
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7. What is the maximum permissible length of the
slotted holes?
3.264
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8. Is the view showing the true shape of the
holes in the tee-slot a primary auxiliary view?
Yes
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Determine the dimensions for the letter
A
1.60
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Determine the dimensions for the letter
B
2.45
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Determine the dimensions for the letter
C
.505
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Determine the dimensions for the letter
D
.190
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Determine the dimensions for the letter
E
.300
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Determine the dimensions for the letter
F
1.225
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Determine the dimensions for the letter
G
.925
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Determine the dimensions for the letter
H
.297
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Determine the dimensions for the letter
I
2.187
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Determine the dimensions for the letter
J MAX
3.974
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Determine the dimensions for the letter
K MIN
.403
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Determine the dimensions for the letter
L MAX
.614
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Oblique Planes

• Oblique surface will never appear as an edge in
  any principal view
• True shape of oblique surface requires an
  auxiliary view to show edge

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Oblique Planes

• Secondary auxiliary view must be projected
  perpendicular to the edge
• Produces true shape

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Oblique Planes

• Used when a feature such as a hole is located on
  the oblique surface
• Principal views may be omitted if not needed for
  clarity

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Oblique Planes

• Auxiliary views may be partial to simplify
  drawings
• Light projection lines or continuous centerlines
  may remain on drawing to help reader visualize
  relationship of views

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Angular Base
1. How many principal views appear on this
drawing?
1
74
Angular Base
2. How many partial views appear on this drawing?
1
75
Angular Base
3. What does the heavy line beneath the 3.000
dimension symbolize?
Not To Scale
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Angular Base
4. What do the parentheses enclosing the 2.76
dimension symbolize?
Reference
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Angular Base
5. What does the box preceding the 3.75 dimension
symbolize?
Square
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Angular Base
6. What does the arrow preceding the .94
dimension symbolize?
Depth
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Angular Base
7. What size fasteners are intended for use in
the four holes?
.375
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Angular Base
8. What is the MMC of the clearance holes?
.404
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Angular Base
9. How many threads will the blind hole contain?
12
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Angular Base
10. How much deeper is the blind hole drilled
than it is tapped?
.19
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Angular Base
11. Is the surface with the tapped hole inclined
or oblique?
Oblique
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Angular Base
12. Is the view containing the thread specs a
primary or secondary auxiliary view?
Secondary
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Angular Base
13. How much material remains between the side of
a clearance hole and the radius around it?
.297
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Angular Base
14. Did the height dimension increase or decrease
as a result of the revision?
Decrease
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Angular Base
15. Did the revision affect the size of the
primary auxiliary view, the secondary auxiliary
view, or both?
Primary
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1. How many principal views appear on the drawing?
1
Angle Plate
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2. Which view (primary or secondary auxiliary)
shows the bend angle?
Primary
Angle Plate
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3. Which view (primary or secondary auxiliary)
shows true shape of the slot?
Secondary
Angle Plate
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4. Which surface (tapped hole surface or slotted
surface) is oblique?
Slotted Hole
Angle Plate
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5. How many degrees is the angle plate bent from
its flat stock position?
65
Angle Plate
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6. What dimension is the inside bend radius?
.25
Angle Plate
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7. What would be the approximate outside bend
radius?
.50
Angle Plate
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8. Is the material (a) low-, (b) medium-, or (c)
high-carbon steel?
(a) Low-Carbon
Angle Plate
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9. Is the drawing (a) half scale or (b)
double-scale?
(a) Half-Scale
Angle Plate
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10. Are threads (a) left-hand or (b) right-hand?
(b) Right-Hand
Angle Plate
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11. What class of fit are the threads?
Class 2
Angle Plate
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12. What thread form is specified?
Unified
Angle Plate
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13. What thread series is specified?
Fine Series
Angle Plate
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14. What is the thread pitch? (Answer decimally.)
.05
Angle Plate
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15. How many threads will each hole contain?
5
Angle Plate
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16. What is the overall length of the slotted
hole?
1.688
Angle Plate
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17. What is the radius at the ends of the slotted
hole?
.094
Angle Plate
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18. What do the parentheses enclosing the .25
dimension indicate?
Reference
Angle Plate
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19. What is the minimum spacing permissible
between threaded holes? (C to C.)
1.997
Angle Plate
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20. What is the maximum overall length
permissible for the slotted hole?
1.694
Angle Plate
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Bend Allowance

• Allowance must be made for the bend in sheet
  metal
• Developed length is the length before bending

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Bend Allowance

• Developed length
• Sum of flat sides
• Added to distance around bend measured along
  neutral axis

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Bend Allowance

• Neutral axis is approximately 0.44 of metal
  thickness
• Measured from inside surface

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Bend Allowance

• Use the following empirical formula
• BA(.017453R.0078T) N
• R is inside radius
• T is metal thickness
• N is number of degrees of bend

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Bend Allowance Calculations
Calculate the developed bland for the shape
shown. Use the empirical formula and round your
answer to three decimal places.
2.918
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Bend Allowance Calculations
Calculate the developed bland for the shape
shown. Use the empirical formula and round your
answer to three decimal places.
2.917
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Bend Allowance Calculations
Calculate the developed bland for the shape
shown. Use the empirical formula and round your
answer to three decimal places.
4.434
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Bend Allowance Calculations
Calculate the developed bland for the shape
shown. Use the empirical formula and round your
answer to three decimal places.
2.704
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Bend Allowance Calculations
Calculate the developed bland for the shape
shown. Use the empirical formula and round your
answer to three decimal places.
3.019
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Bend Allowance Calculations
Calculate the developed bland for the shape
shown. Use the empirical formula and round your
answer to three decimal places.
3.589