ME 360 – H12
Name _________________________
1) Identify dimensions of involute gear tooth form (e.g. use terms like xxx radius, xxx depth,
xxx height, xxx thickness, xxx space, xxx pitch, xxx angle).
1) ______________________________
8) ______________________________
2) ______________________________
9) ______________________________
3) ______________________________
10) ______________________________
4) ______________________________
11) ______________________________
5) ______________________________
12) ______________________________
6) ______________________________
13) ______________________________
7) ______________________________
14) ______________________________
SECOND PROBLEM ON FOLLOWING
PAGE
ME 360 – H12
Name _________________________
2) Select a pair of spur gears with standard full-depth 20 degree AGMA teeth that provide an
EXACT speed ratio 2/3 = 3 and operate at a center distance of approximately 2.1 inches.
a) You must specify integer numbers of teeth for each gear and standard AGMA coarse
diametral pitch pd. Your actual center distance must be as close as possible to the design
specification requested above and the smaller gear must have at least 15 teeth. Show your
work.
N2 __________
N3 __________
pd __________
CACTUAL __________
b) Use “gear_AGMA.xls” to determine contact ratio, tip thickness of the pinion and
interference.
Attach hardcopy of the spreadsheet with your values.
mp __________
ta2 __________
Interference?
YES
NO
c) What are the minimum inside length and inside height for a rectangular gear box to hold your
gear pair?
LMIN __________
HMIN __________
pitch circles for gears 2 and 3
(not to scale)
C
HMIN
O2
O3
LMIN
EXTRA CREDIT ON FOLLOWING PAGE
ME 360 – H12
Name _________________________
EXTRA CREDIT
Generate two different random data sets each with size (10,000 x 1) using MATLAB "rand" and
"randn" random number generators. Plot histograms for each data set. Attach hardcopy of your
code and the histograms. Use the table below to describe differences between these two random
data sets.
rand
expected mean value
expected minimum value
expected maximum value
expected standard deviation
type of probability
distribution function (PDF)
randn