Team Gravity Light
Members: Yu Hui Lui, Yong Jie Lim, Randall Lenarz, Todd Heidrich, Travis Heidrich
For our application, our team developed a low torque high rpm power train that was
designed to transmit power to a generator to power an LED light. The middle shaft transferred
the power from the input shaft by a way of two helical gears and transferred that power to the
output shaft by a way of two spur gears. The desired rpm’s output was 810rpm with a speed
ratio (out/in) of 9. As a group throughout the semester, we developed our skills as future
engineers. This final project gave us the chance to practice our collective multifaceted
knowledge to develop a power train we are proud of. Thank you for a great semester! Have a
great holiday and a MERRY CHRISTMAS to YOU !

1.43
0.43
1.33
R0.05 x 2
4.03
4.18
4.93
0.10
0.105.37
R0.350
R0.30
R0.25
0.08
0.08
Shaft 2, Shaft of Interest For Gravity Light
All Dimensions in Inches
Modeled by Randall Lenarz
Shaft Material: AISI 4130 Steel Annealed at 865 °C

6
8 7 4
5 9
11
1
3
2
10
9
11
11
11
10
10
10
2.37
2.75
2.71
3.05
3.80
R0.05 X 2
6.40
7.20
7.30
7.35
7.39
7.73
1.50
1.50
ITEM NO. PART NUMBER DESCRIPTION QTY.
1 Housing 1
2 shaft 1 Not shaft of interest (dimensions unneeded) 1
3 Gear 1, Custom
Rush Gears, Helical, Helix Angle = 30, 33
teeth, Hub Diam = .7 in., Hub Length = .25 in.,
Steel, Bore Diam = .5 in., Keyway Width = .1
in., Keyway Depth = .08in. (Keyway as long
as gear)
1
4
Custom-Made Shaft, No
Bearings Attached Dimensioned in Drawing for Second Shaft 1
5 Gear 2, Custom
Rush Gears, Helical, Transverse Pitch = 11,
Pressure Angle = 14.5, Helix Angle = 30, 11
Teeth, Hub Diam = .7 in., Hub Length = .1 in.,
Steel, Bore Diam = .5in, Keyway Width = .1
in., Keyway Depth = .05 in. (Keyway Length
of gear)
1
6 Gear 3, Custom
Rush Gears, Spur, Pitch = 11, Pressure Angle =
20, 33 Teeth, Hub Diam = .7 in., Hub Length =
.25 in., Steel, Bore Diam = .5in, Keyway Width
= .1 in., Keyway Depth = .08 in. (Keyway
length of gear)
1
7
Custom-made, includes
roller-bearings. Not shaft of interest 1
8 Gear 4, Custom
Rush Gears, Spur, Pitch = 11, Pressure Angle =
20, 11 Teeth, Hub Diam = .7 in., Hub Length =
.5in., Steel, Bore Diam = .5in, Keyway Width =
.1 in., Keyway Depth = .05 in.
1
9
Inner P/N A4050, Outer P/N
A4138
Timken TS Type Single-Row Tapered Roller
Bearing
2
10 Bolt (FMW Fasteners
Standard Part) Hex Bolts, SAE Grade 2 Steel, 3/4"-10 x 2" 4
11
Fastenal Part No. (SKU):
36554
3/4"-10 ASTM A194 2-H Plain Finish Heavy Hex
Nut
4
Final Assembly
Randall Lenarz
WEIGHT:
A1
SHEET 1 OF 1SCALE:1:2
DWG NO.
TITLE:
REVISION: NewDO NOT SCALE DRAWING
MATERIAL:
DATESIGNATURENAME
DEBUR AND
BREAK SHARP
EDGES
FINISH:UNLESS OTHERWISE SPECIFIED:
DIMENSIONS ARE IN MILLIMETERS
SURFACE FINISH:
TOLERANCES:
LINEAR:
ANGULAR:
Q.A
MFG
APPV'D
CHK'D
DRAWN

Element Length Moment Modulus Dist Load Dist Load Shear Moment M
(in.) (in.^4) (psi) (lb/in.) (lb/in.) (lb) (lb-in.)
1 0.25 0.003068 29730000 0 0 -2.1 0
2 0.375 0.003068 29730000 0 0 -2.1 0.5354
3 0.375 0.003068 29730000 0 0 -0.2418 1.34
4 0.05 0.003068 29730000 0 0 -0.2418 1.43
5 2.6 0.01179 29730000 0 0 -0.2418 1.44
6 0.05 0.003068 29730000 0 0 -0.2418 2.07
7 0.375 0.003068 29730000 0 0 -0.2418 2.08
8 0.375 0.003068 29730000 0 0 -4.9 -2.35
9 0.1 0.003068 29730000 0 0 -4.9 -0.4942
Node Concentra Concentra Specified Specified xy-plane Slope
(lb) (lb-in.) (in.) (radians) (in.) (radians)
1 0 0 0 0 0 1.659E-05
2 0 0 0 0 4.085E-06 1.585E-05
3 1.9 0 0 0 9.411E-06 1.2E-05
4 0 0 0 0 1.286E-05 6.31E-06
5 0 0 0 0 1.315E-05 5.523E-06
6 0 0 0 0 1.159E-05 -7.499E-06
7 0 0 0 0 1.119E-05 -8.637E-06
8 -4.7 -4.52 0 0 6.322E-06 -1.738E-05
9 0 0 0 0 1.136E-06 -1.154E-05
10 0 0 0 0 0 -1.127E-05
Slopes MD Solids xy-plane
MDSolids - Educational Software for Mechanics of Materials Copyright © 1997-2014 Timothy A. Philpot

Shear Moment M
(lb) (lb-in.)
2.1 -0.5354
2.1 -1.34
0.2418 -1.43
0.2418 -1.44
0.2418 -2.07
0.2418 -2.08
0.2418 -2.17
4.9 0.4942
4.9 0
MDSolids - Educational Software for Mechanics of Materials Copyright © 1997-2014 Timothy A. Philpot

MDSolids - Educational Software for Mechanics of Materials Copyright © 1997-2014 Timothy A. Philpot
Element
Number Length
Moment
of Inertia
of
Elasticity
at Start
Node
Dist Load at
End Node
Shear Force V
at Start Node
M at
Start
Force V
at End
M at End
Node
(in.) (in.^4) (psi) (lb/in.) (lb/in.) (lb) (lb-in.) (lb) (lb-in.)
1 0.25 0.00307 3E+07 0 0 -6.1 0 6.1 -1.53
2 0.375 0.00307 3E+07 0 0 -6.1 1.53 6.1 -3.83
3 0.375 0.00307 3E+07 0 0 -0.9247 3.83 0.9247 -4.17
4 0.05 0.00307 3E+07 0 0 -0.9247 4.17 0.9247 -4.22
5 2.6 0.01179 3E+07 0 0 -0.9247 4.22 0.9247 -6.63
6 0.05 0.00307 3E+07 0 0 -0.9247 6.63 0.9247 -6.67
7 0.375 0.00307 3E+07 0 0 -0.9247 6.67 0.9247 -7.02
8 0.375 0.00307 3E+07 0 0 14.8 7.02 -14.8 -1.48
9 0.1 0.00307 3E+07 0 0 14.8 1.48 -14.8 0
Node
Number
Concentr
ated
Force
Concentr
ated
Moment
Specified
Deflectio
n
Specified
Slope
XZ-plane
Deflection Slope
xy-plane
deflectio
ns
Total
deflectio
n
(lb) (lb-in.) (in.) (radians) (in.) (radians) inches inches
1 0 0 0 0 0 5.18614E-05 0 0
2 0 0 0 0 1.2791E-05 0.000049763 4.1E-06 1.3E-05
3 5.2 0 0 0 2.9681E-05 3.87464E-05 9.4E-06 3.1E-05
4 0 0 0 0 4.1171E-05 2.22957E-05 1.3E-05 4.3E-05
5 0 0 0 0 4.2228E-05 1.99945E-05 1.3E-05 4.4E-05
6 0 0 0 0 4.5784E-05 -0.000020232 1.2E-05 4.7E-05 <=== Maximum
7 0 0 0 0 4.4681E-05 -2.38765E-05 1.1E-05 4.6E-05 Deflection from MD Solids
8 15.7 0 0 0 3.0495E-05 -5.20179E-05 6.3E-06 3.1E-05
9 0 0 0 0 7.0022E-06 -6.94824E-05 1.1E-06 7.1E-06
10 0 0 0 0 0 -7.02923E-05 0 0
FEA Maxium
Deflection
(in)
MD Solids
Max
Deflection (in) Percent Differnce (%)
4.34E-05 4.723E-05 8.17
Slopes MD solids xz-plane