1. Team Gravity Light developed a low torque, high rpm power train to transmit power from an input shaft to an output shaft via gears in order to power an LED light. 2. The power train used helical gears to transfer power from the input shaft to a middle shaft, and spur gears to transfer power from the middle shaft to the output shaft. 3. The power train achieved its desired output of 810 rpm with a 9:1 speed ratio, and allowed the team members to improve their engineering skills over the course of the project.

1. 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 !

2. 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

3. 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

12. 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

13. 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

14. 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