Transcript Blueprint Reading for the Machine Trades, Sixth Edition Unit 15

Blueprint Reading for the
Machine Trades, Sixth Edition
Unit 15: Spur Gear Terminology
Russ Schultz and Larry Smith
PowerPoint presentation created by
LaVonne Vichlach
1
Spur Gear Terminology



Addendum-radial distance on tooth
from pitch circle to outside circle
Center distance-center-to-center
distance between axes of two meshing
gears
Chordal addendum-radial distance from
the top of the tooth to the chord of the
pitch circle
Schultz and Smith:
Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
2
Spur Gear Terminology



Chordal thickness-length of chord along
the pitch circle between the two sides
of the tooth
Circular pitch-length of pitch circle arc
between corresponding points of
adjacent teeth
Circular thickness-thickness of tooth
measured along chord of pitch circle
Schultz and Smith:
Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
3
Spur Gear Terminology



Clearance-distance allowed between top of
tooth and bottom of mating tooth space-to
avoid interference when meshing
Dedendum-redial distance on tooth from
pitch circle to root circle
Diametral pitch-ratio of number of teeth to
the number of inches of pitch diametermating gears must have same diametral pitch
Schultz and Smith:
Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
4
Spur Gear Terminology



Number of teeth-total quantity of teeth
formed along the pitch circle
Outside diameter-maximum diameter
Pitch diameter-diameter of pitch circle
Schultz and Smith:
Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
5
Spur Gear Terminology


Pressure angle-standard angle at which
pressure from the tooth of one gear is
passed to tooth of another-involute
gears use 14 1/2° or 20°
Root diameter-diameter of the root
circle
Schultz and Smith:
Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
6
Spur Gear Terminology
Schultz and Smith:
Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
7
Spur Gear Formulas
Schultz and Smith:
Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
8
Spur Gear Terminology
Schultz and Smith:
Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
9
Spur Gear Terminology
Schultz and Smith:
Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
10
Spur
Gear
1. What is the
outside
diameter of
the spur
gear?
6.500
Schultz and Smith:
Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
11
Spur
Gear
2. What is the
pitch
diameter of
the spur
gear?
6.00
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Machine Trades, 6th edition
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12
Spur
Gear
3. Are mating
spur gear
spacings
determined
by (a) their
OD or (b)
their PD?
(b) their PD
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Machine Trades, 6th edition
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13
Spur
Gear
4. What
pressure
angle is
specified?
20°
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Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
14
Spur
Gear
5. Calculate the
addendum
using the
formula on
page 357.
.25
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Blueprint Reading for the
Machine Trades, 6th edition
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15
Spur
Gear
6. Calculate the
dedendum
using the
proper
formula.
.28925
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Machine Trades, 6th edition
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16
Spur
Gear
7. Calculate the
root
diameter.
5.4215
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Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
17
Spur
Gear
8. What is the
minimum
wall
thickness
between the
bore and the
hub?
.369
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Blueprint Reading for the
Machine Trades, 6th edition
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18
Spur
Gear
9. Show the
limits of the
gear
thickness.
.9951.005
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Machine Trades, 6th edition
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19
Spur
Gear
10. What is
the
thickness
of the
spokes?
.50
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20
Spur
Gear
11. What is the
width of the
keyway?
.250
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Machine Trades, 6th edition
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21
Spur
Gear
12. What is the
fillet radius?
.25
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22
Spur
Gear
13. What is the
length of
each
spoke?
1.25
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Machine Trades, 6th edition
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23
Spur
Gear
14. What is the
approximate
spoke width
midway
between
the hub and
the rim?
.94
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24
Spur
Gear
15. Would a
mating
gear have a
diametral
pitch of
(a) 4, (b) 5,
or (c) 8?
(a) 4
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25
Splined
Shaft
1. What
method of
dimensioning
was used?
dual
dimensioning
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Splined
Shaft
2. What type of
section was
used on the
left side of
the shaft?
broken-out
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Machine Trades, 6th edition
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Splined
Shaft
3. What type of
view was
drawn to
dimension
the neck?
partial
enlarged
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Splined
Shaft
4. What is the
metric
diameter of
the neck?
11
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29
Splined
Shaft
5. What is the
outside
diameter
(inches) of
splines A and
B?
1.000
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Machine Trades, 6th edition
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Splined
Shaft
6. Is the
specified
material (a)
carbon steel
or (b) an
alloy steel?
(a) carbon
steel
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Splined
Shaft
7. How many
chamfers are
to be
machined on
the outside?
6
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Machine Trades, 6th edition
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Splined
Shaft
8. What
pressure
angle is
specified for
the splines?
20°
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Blueprint Reading for the
Machine Trades, 6th edition
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Splined
Shaft
9. Are the
spline teeth
(a) parallelsides or (b)
involute?
(b) involute
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Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
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Splined
Shaft
10. What is the
pitch
diameter
(inches) of
the spline?
.9286
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Machine Trades, 6th edition
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Splined
Shaft
11. What are
the metric
limits of the
shaft
length?
177.55 –
178.05
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Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
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Splined
Shaft
12. What is the
metric
depth of the
blind hole?
44.5
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Machine Trades, 6th edition
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Splined
Shaft
13. What is the
effective
length
(inches) of
spline A?
(Include the
chamfer.)
.75
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Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
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Splined
Shaft
14. What is the
length
(inches) of
spline B?
(Include the
chamfer.)
1.594
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Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
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Splined
Shaft
15. What is the
length
(inches) of
the .812
Dia?
1.3695
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Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
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Splined
Shaft
16. What is the
maximum
length
(inches) of
the 1.125
Dia?
1.52
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Splined
Shaft
17. What is the
minimum
length
(millimeters)
of the .812
Dia?
33.41
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Blueprint Reading for the
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© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
42
Splined
Hub
1. How many
teeth does
the external
spline
contain?
20
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Splined
Hub
2. How many
teeth does
the internal
spline
contain?
11
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Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
44
Splined
Hub
3. What is the
maximum
OD of the
part?
1.738
Schultz and Smith:
Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
45
Splined
Hub
4. What is the
minimum ID
of the part?
.6306
Schultz and Smith:
Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
46
Splined
Hub
5. What is the
pressure
angle of the
teeth?
20°
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Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
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Splined
Hub
6. Are the
spline teeth
(a) involute
or (b)
parallelsided?
(a)
involute
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Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
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Splined
Hub
7. What is the
diametral
pitch of the
external
spline?
12
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Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
49
Splined
Hub
8. What is the
diametral
pitch of the
internal
spline?
16
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Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
50
Splined
Hub
9. What is the
pitch diameter
of the external
spline?
(Calculate.)
1.6667
Schultz and Smith:
Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
51
Splined
Hub
10. What is the
pitch
diameter of
the internal
spline?
(Calculate.)
.6875
Schultz and Smith:
Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
52
Splined
Hub
11. What is the
maximum
length of
the 1.250
diameter?
(Disregard
radius.)
.361
Schultz and Smith:
Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
53
Splined
Hub
12. What is the
minimum
length of
the 1.250
diameter?
(Disregard
radius.)
.338
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Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
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Splined
Hub
13. What size
pins are
specified for
measuring
the external
spline?
.1600
Schultz and Smith:
Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
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Splined
Hub
14. How many
chamfers
does the
part
contain?
3
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Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
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Splined
Hub
15. What is the
carbon
content of
the steel?
0.20%
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Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
57
Splined
Hub
16. What type
of section is
the top
view?
full
section
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Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
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Splined
Hub
17. What type
of lines are
used to
represent
teeth on the
front view?
phantom
lines
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Blueprint Reading for the
Machine Trades, 6th edition
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Splined
Hub
18. What is the
maximum
surface
roughness
tolerance
specified?
250
Microinches
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Splined
Hub
19. What
Rockwell
hardness is
specified?
(Include the
letters.)
RC 56 Min
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Splined
Hub
20. What is the
diameter of
the bar
stock
specified?
1.750
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Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
62
Spur
Gear
1. What
diametral
pitch would
be required
for a mating
gear?
10
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Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
63
Spur
Gear
2. Do the
material
specifications
designate a
carbon steel
or an alloy
steel?
Alloy
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Blueprint Reading for the
Machine Trades, 6th edition
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Spur
Gear
3. Do the
geometric
tolerances
apply at
LMC, MMC,
or RFS?
RFS
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Blueprint Reading for the
Machine Trades, 6th edition
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Spur
Gear
4. Show the
pressure
angle of this
gear’s teeth.
20°
Schultz and Smith:
Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
66
Spur
Gear
5. Interpret the
geometric
characteristic
symbol on
the pitch
diameter.
Position
Schultz and Smith:
Blueprint Reading for the
Machine Trades, 6th edition
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Spur
Gear
6. Interpret the
geometric
characteristic
symbol on
datum C.
Perpendicularity
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Blueprint Reading for the
Machine Trades, 6th edition
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Spur
Gear
7. Interpret the
geometric
characteristic
symbol on
datum B.
Cylindricity
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Spur
Gear
8. Show the
addendum
dimension
on this
gear’s teeth.
.100
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Blueprint Reading for the
Machine Trades, 6th edition
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Spur
Gear
9. Show the
MMC of
datum A.
1.000
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Spur
Gear
10. Show the
MMC of
datum B.
2.679
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Blueprint Reading for the
Machine Trades, 6th edition
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Spur
Gear
What is the
dimension for
the letter?
A
2.679
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Blueprint Reading for the
Machine Trades, 6th edition
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73
Spur
Gear
What is the
dimension for
the letter?
B
12°
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Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
74
Spur
Gear
What is the
dimension for
the letter?
C
1.298
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Blueprint Reading for the
Machine Trades, 6th edition
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75
Spur
Gear
What is the
dimension for
the letter?
D
.128
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Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
76
Spur
Gear
What is the
dimension for
the letter?
E
.08
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Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
77
Spur
Gear
What is the
dimension for
the letter?
F
.26125
Schultz and Smith:
Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
78
Spur
Gear
What is the
dimension for
the letter?
G
.2157
Schultz and Smith:
Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
79
Spur
Gear
What is the
dimension for
the letter?
H
.047 MIN
Schultz and Smith:
Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
80
Spur
Gear
What is the
dimension for
the letter?
I
.685 MAX
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Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
81
Spur
Gear
What is the
dimension for
the letter?
J
.615 MIN
Schultz and Smith:
Blueprint Reading for the
Machine Trades, 6th edition
© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
82