P14651: Drop Tower for Microgravity
Simulation
Adam Hertzlin
Dustin Bordonaro
Jake Gray
Santiago Murcia
Yoem Clara
Agenda
 List of experiments
 Engineering Requirements
 Concept Design
 Subsystem / System Analysis
 Data Analysis Software Files
 Risk Assessment
 Test Plan
 MSD II Schedule
 Bill of Materials
List of Experiments
1.
Vacuum vs. Atmosphere
Time
– Fall
4.
 Undergraduate Level (Fluids / Numod)
 Middle School Level (Science)
 Requires Complete System
 Requires Vacuum Chamber
 Start and End Time Required
 No Calculations Needed
2.
Calculate Drag Coefficient
 High School Level (Physics)
Decreasing Object Acceleration (Air
Resistance)
 Requires Complete System
 Undergraduate Level (Fluids)
 Start and End Time Required
 Requires Release / Laser System
Gravity in Vacuum Conditions
5.
 Multiple Data Points Required
3.
Gravity in Atmospheric Conditions
 Undergraduate Level (Physics)
 Requires Release / Laser System
 Start and End Time Required
6.
Extra Vacuum Experiments
 Middle School Level (Science)
 Requires Vacuum Chamber
 No Data Required
Engineering Requirements
Rqmt.
#
SR1
SR2
SR3
SR4
SR5
SR6
SR7
SR8
SR9
SR10
SR11
SR12
SR13
SR14
SR15
SR16
SR17
I
9
9
9
9
9
9
9
9
9
3
3
3
3
3
3
3
3
Unit of
Measure
Marginal Value
Ideal Value
ft
sec
psi
min
psi / sec
Yes / No
in
FOS
millisecond
ft
in
0-15
0-2
0-14.7
1-10 mins
0-?
Yes
0-?
0-5
0-?
10-15
6-8
>Tower Height
Pump Flow Rate
ft3/min
2-10
10
Impact Energy Dissipation Method
Joule
0-(mmaxvfinal2/2)
(mmaxvfinal2/2)
ft3/min
% error
Yes / No
0-?
0 - 1%
Yes
?
0%
Yes
in
(0.50*ID)-(0.99*ID)
(0.99*ID)
Engr. Requirement (metric)
Measure Relative Object Position
Measure Relative Object Drop Time
Measure Pressure
Cycle Run Time
Pressure Leak Rate Minimized
Aesthetic Structure with Supports
No Horizontal Motion
Tube Collapse Pressure
Timing difference of object release
Tower Height
Tower Cross - Section (Diameter)
Air Intake - Tower Pressure Change Rate
Minimal Error in Calculations
Aesthetic Data Display
Platform for Stationary Experiments
0 - 14.7
1 min
0
Yes
0
5
0
15
8
Drop Tower Design
Tower Height Distribution
Total Height of Tower
11’ 1.30”
3.385 m
Drop
Distance
8’ 3.77”
2.535 m
Total Height Available
11’ 7”
3.53 m
Results
 Total available height: 3.53 m (11ft 7in)
 Total used height: 3.385 m (11ft 1.3in)
 Total clearance: 0.145m (5.7 in)
 Total drop distance: 2.535m (8ft 3.77in)
 In Vacuum:
 Total drop time with standard gravity is .719s
 Speed at impact is 7.052 m/s
Full System Analysis
Release Mechanism Analysis
Solid Model
Section View
Motor Type w/ Specifications
 Speed at 6V
 0.12 sec/60°
 0.04 sec/60°
 0.24 m/s
 Torque
 61 oz-in
 3.81 in-lb
 0.43 Nm
 Weight
 43g
Max Applied Force
 Gear Ratio
 3
 Length of the door
 1.5 in (0.038 m)
Micro-Controller
Future Use Compatibility
•
The tower that will be built will have the capabilities of hosting a
continuous lift system within the pipe. All the other subsystems would
be able to work as regular with the moving system.
•
The only thing that would have to be address would be the modification
of the software so it can monitor the displacement of the platform.
Displacement
Platform
This platform would be the
one responsible to catch the
objects at the bottom of the
tower and to bring them to
be pick up by the release
mechanism.
Object
Positioning
Assembly
This assembly will allow the
object to be picked up by the
release mechanism doors.
A stopper in the release
mechanism fixture will
activate the motion upwards,
and gravity would do the work
to bring it back to a regular
position.
Object Positioning Assembly
Frame Analysis
Tube Deflection
 Assumes a worst case, where the entire structure is laying
horizontally, 10ft (~3m) tower.
 The tube is fixed at the riser clamps pictured above, and is
analyzed with two or three riser clamps, at either 8 or 4ft (2.44 to
1.22m) apart.
 With 2, ymax is -.058in (-1.5mm)
 With 3, ymax is -.0037in (-.093mm)
 So, three riser clamps will be used as deflection is decreased
dramatically
Riser Clamp Connections
Critical Tipping Scenario
Tower Supports
Frame Subsystem Analysis
Subcomponent Selection
 Rotation joints at top (for laser adjustment):
 From McMaster-Carr
 ¼” binding post
 ¼” bolt
 Wheels and axels:
 Wheels from McMaster-Carr, each supports 250 lbs.
 Axels from McMaster-Carr, analysis follows.
 Height adjustment/leveling:
• From McMaster-Carr,
6 required, each supports 250 lbs
Axel Calculations
I= 1.27698E-09 m^4
a=.0381m
F2 (fixed)
fy=0: F1+W-F2=0
b=.026m
M(wheel)=0: -F1(.0381+.026)+F2(.026)=0
F1=522.2N; F2=1287.4N
x
Singularity Functions:
F1 (fixed)
Reaction at Wheel (weight) (free)
Deflection
M(x)=F1x-F2<x-a>^1
0.060
EI(d2y/dx2)=F1x-F2<x-a>^1
0.050
EIY=(1/6)F1x^3-(1/6)F2<x-a>^3+c1x+c2
@x=0,y=0: c2=0
@x=a,y=0: c1=-(1/6)F1a^2
deflection-mm
EI(dy/dx)=.5F1x^2-.5F2<x-a>^2+c1
0.040
0.030
0.020
Deflection
0.010
0.000
so, y=(1/EI)*((1/6)F1x^3-(1/6)F2<x-a>^3-(1/6)F1xa^2)
Also, shearing of axels:
τ= 6.69E+06 Pa
FOS=
55
-0.010
-0.020
0
10
20
30
40
x-mm
50
60
70
80
Laser & DAQ Analysis
Specifications & Setup
 Micro-Epsilon ILR 1030-8/LC1
 10ms response time -- over ~2.6m (8.5 ft) this is ~ 70 data points








(fall
time .727 seconds in a vacuum)
+/- 2.5mm accuracy
4-20 mA output related to distance fallen, and must be calibrated. So 4mA=0m
and 20mA=2.6m
Voltage will be created from mA output via a 249 ohm resistor, for DAQ purposes;
DAQ will be NI USB-6008
Can see though polycarbonate, as long as it passes through before start of data
collection (data collection starts at 0.2m (7.9in) and angle of entry +/5° from
perpendicular to surface
Laser is visible dot (important for alignment and calibration)
M12 connector for power and interface, requires 10-30 VDC
M12 cable has pigtail bare lead ends
Mounted via M5 through holes
Frame Mounting Components
Bending of Links
Assumptions:
-Treat multiple distributed loads as a point
load on the end
-Treat as a solid beam 250mm to mass
application
apllication
Total weight of all components is ~5N
Applying twice this at 250mm:
I= (1/12)*b*h^3
I=
4.06E-10 m^4
Beam dimensions:
l=
b=
h=
250 mm
19.05 mm
6.35 mm
E= 2.05E+11 Pa
y=
y=
y=
-0.000625 m
-0.63 mm
-0.024608 in
Pipe Analysis
CAD Drawing
Critical Negative Pressure
Critical Pressure Calculations for Clear PVC
P
14.7 psi
v
0.37
E
429000 psi
Formula
PCrit=(2*E/(1-v^2))*(1/((OD/t)-1)^3)
SCH 40 Pipe Maximum Pressure
Size (in)
OD (in)
Thickness (in)
Max Pressure (psi)
Factor of Safety
6
6.625
0.28
85.43
5.81
 Desired Factor of Safety = 3-4
Max Pressure Rating of Schedule 40 PVC*, from HARVEL
Size (in)
6
Max Pressure (psi)
90
*Specifications for white PVC
Pipe Dimensions Courtesy of Engineeringtoolbox.com
Factor of Safety
6.12
Energy Dissipation Analysis
Material Selection
 Polystyrene Beads (Bean Bag)
Critical Dimensions of Impact
Absorption material
Critical Dimensions of Impact Absorption material
𝑚𝑎
𝑚𝑏=
𝐶𝑅
• Assuming a Object 1 mass of 1kg.
• Assuming a Coefficient of Restitution of 0.712
• Assuming a Ball Radius of 0.0508 m (2 in)
.
Height of
energy
absorbing
material
= 0.16 m
̴ 16 cm
(6.30 in)
Volume =Mass / density
Area= Pi x Radius^2
Height = Volume / Area
Pump Analysis
Specifications
 Free Air Displacement – 6.25 CFM @ 60Hz
 Horse Power – 1/2 HP
 RPM – 3440 @ 60Hz
 Ultimate Vacuum – 15 microns (2 Pa)
 Intake Ports (male flare) – 1/4", 3/8" SAE Male & 1/2"
ACME Male
 Oil Capacity – 15 oz./450 ml
 Dimensions – 13.7'' x 5.6'' x 10.4''
 Shipping Weight – 25.4lb/11.5kg
Evacuation Time
 Equivalent Length, Le, based on pipe losses
 Effective Pump Speed based on pipe geometry and flow regime
 Evacuation Time based on Volume, Pump Speed and flow regime
Main Pipe
Secondary Pipe
Combination of Pipes
Evacuation Time
Total Le (ft.)
60.0
3.9
Conductance (cfm)
Viscous
Transitional Molecular
4268347.2
315.4
49.0
16135.4
2.4
1.5
Sp
(cfm)
6.25
Effective Pump Speed (cfm)
Viscous
Transitional Molecular
6.25
1.70
1.17
4.74
1.38
 Total Evacuation Time (no leaks): 6.12 mins
N/A
Connection Port Analysis
Cable Feed Through
•
•
•
•
•
•
By recommendation of Dr. Robert Pearson and a
price vs. effectiveness research. The use of potting
compound is preferable for our application
Apiezon Sealing compound Q is an economic option
to seal a leak in a vacuum system. It is sufficiently
firm at room temperature to remain in position, yet
soft enough to be molded by hand and is readily
removed
Some Properties:
temperature range, °C: -10 to + 30
Vapor pressure @ 20°C, in torr: 1x10-4
Packaging: 1 kg
Cable
Polycarbonate Plate
Shrink Tubing
Sealing Compound
Pipe Connection - Bottom
 Connection allows for vacuum hose to be
Brewer’s Hardware
- P/N WLFM12F12
-Weldless Bulkhead
- 1/2" MPT X 1/2" FPT
connected though the bottom
polycarbonate cap
 Seals against each side via gasket
 Allows for pipe to be screwed on inside
drop tower to pass by polystyrene beam
bag
Pipe Fitting
Analysis
Pipe End Cap Fittings
Top
Bottom
Tower Fittings
Pressure Gauge Analysis
Digital Vacuum Gauge
Specifications
 Range
 Atmospheric to 0 microns
 Max Working pressure 400 PSIG
 Acurracy
 +/- 10%
 Powered By
 9V Battery
 Operating Temp. Range
 32° - 120° F (Compensated)
 -22° - 158° F (Non-Compensated)
 Mechanical Connection
 Standard 1/4” female SAE refrigerant
hose type with core depressor
Labview / Matlab Code
Vacuum Conditions
 Calculating Gravity within a vacuum
 Base chamber pressure will be considered as the optimal vacuum condition (Goal = 2Pa
or 15 microns)
𝑔
𝛥𝑔
𝜕𝑔
∗ 𝛥𝑥
𝜕𝑥
2𝑥
𝑡2
2
𝜕𝑔
+
∗ 𝛥𝑡
𝜕𝑡
Note: Pressure threshold between Vacuum and Non-vacuum will be
determined through tested
2
Model Sensitivity - Vacuum
 Which measurement is the most critical?
 Assume Δ# is 1% of # (for each variable)
 𝛥𝑔
𝜕𝑔
𝜕𝑥
∗ 𝛥𝑥
2
+
𝜕𝑔
𝜕𝑡
∗ 𝛥𝑡
2
 Use position (x) component of 𝛥𝑔 as datum
 Compare other variables relative to position


𝜕𝑔
∗𝛥𝑥
𝜕𝑥
𝜕𝑔
∗𝛥𝑥
𝜕𝑥
𝜕𝑔
∗𝛥𝑡
𝜕𝑡
𝜕𝑔
∗𝛥𝑥
𝜕𝑥
100% (𝐷𝑎𝑡𝑢𝑚)
200%
 In other words, the time measurement is 2x more critical than the
position measurement.
Atmospheric Condition
 Calculating Gravity with Drag
 Pressure range: Atmospheric Pressure –Vacuum Pressure Threshold
𝑚𝑎
𝑑𝑉
𝑑𝑡
𝑔
𝛥𝑔
𝜕𝑔
∗ 𝛥𝑥
𝜕𝑥
2
𝐹𝐷
𝑚𝑔
𝜌𝐶𝐷 𝑉 2 𝐴
2𝑚
𝑔
𝑥𝜌𝐶𝐷 𝐴
2𝑚
2𝑚
∗ 𝑖𝑛𝑣𝑐𝑜𝑠ℎ 𝑒
2
𝜌𝐶𝐷 𝐴𝑡
𝜕𝑔
+
∗ 𝛥𝑡
𝜕𝑡
2
𝜕𝑔
+
∗ 𝛥𝑚
𝜕𝑚
2
𝜕𝑔
+
∗ 𝛥𝐴
𝜕𝐴
2
2
𝜕𝑔
+
∗ 𝛥𝜌
𝜕𝜌
2
𝜕𝑔
+
∗ 𝛥𝐶𝐷
𝜕𝐶𝐷
2
Model Sensitivity - Atmospheric
𝛥𝑔
𝜕𝑔
∗ 𝛥𝑥
𝜕𝑥

𝜕𝑔
∗𝛥𝑥
𝜕𝑥
𝜕𝑔
∗𝛥𝑥
𝜕𝑥

𝜕𝑔
∗𝛥𝑡
𝜕𝑡
𝜕𝑔
∗𝛥𝑥
𝜕𝑥

𝜕𝑔
∗𝛥𝑚
𝜕𝑚
𝜕𝑔
∗𝛥𝑥
𝜕𝑥
2
𝜕𝑔
+
∗ 𝛥𝑡
𝜕𝑡
2
𝜕𝑔
+
∗ 𝛥𝑚
𝜕𝑚
100% 𝐷𝑎𝑡𝑢𝑚
200%
0.213%
2
𝜕𝑔
+
∗ 𝛥𝐴
𝜕𝐴
2
𝜕𝑔
+
∗ 𝛥𝜌
𝜕𝜌
2
𝜕𝑔
+
∗ 𝛥𝐶𝐷
𝜕𝐶𝐷

𝜕𝑔
∗𝛥𝐴
𝜕𝐴
𝜕𝑔
∗𝛥𝑥
𝜕𝑥
0.213%

𝜕𝑔
∗𝛥ρ
𝜕ρ
𝜕𝑔
∗𝛥𝑥
𝜕𝑥
0.213%

𝜕𝑔
∗𝛥𝐶𝐷
𝜕𝐶𝐷
𝜕𝑔
∗𝛥𝑥
𝜕𝑥
0.213%
2
Example:
𝛥𝑔
𝜕𝑔
∗ 𝛥𝑥
𝜕𝑥
2
𝑔
𝜕𝑔
+
∗ 𝛥𝑡
𝜕𝑡
2
2𝑚
𝜌𝐶𝐷 𝐴𝑡 2
∗ 𝑖𝑛𝑣𝑐𝑜𝑠ℎ 𝑒
𝜕𝑔
+
∗ 𝛥𝑚
𝜕𝑚
2
𝑥𝜌𝐶𝐷 𝐴
𝜕𝑔
+
∗ 𝛥𝐴
𝜕𝐴
2
2
2𝑚
𝜕𝑔
+
∗ 𝛥𝜌
𝜕𝜌
2
𝜕𝑔
+
∗ 𝛥𝐶𝐷
𝜕𝐶𝐷
2
Gravity = g +/- Δg
Given Variables:
m= 0.067278 kg
t= 0.782895 sec
ρ= 1.2041 kg/m^3
x= 3.0 m
A= 0.0005067075 m^2
Cd= 0.47
Scenario #1
Scenario #2
Scenario #3
+/- 1% for all variables
+/- 10% for Cd
+/- 1% for all other variables
+/- 10% for t
+/- 1% for all other variables
g= 9.81 +/- 0.2195 m/s^2
(2.24% Error)
g= 9.81 +/- 0.2195 m/s^2
(2.24% Error)
g= 9.81 +/- 1.9645 m/s^2
(20.03% Error)
Labview Front Panel
Matlab Code
 Drag Coefficient, 𝐶𝐷
 Cannot solve directly for 𝐶𝐷
𝑔
𝑥𝜌𝐶𝐷 𝐴
2𝑚
2𝑚
∗
𝑖𝑛𝑣𝑐𝑜𝑠ℎ
𝑒
𝜌𝐶𝐷 𝐴𝑡 2
2
 Use root finding method to solve for 𝐶𝐷
 Secant Method (or other)
 Must assume value for gravity (9.81 m/s^2)
 Import Position and Time Data from Labview
 Experiment will require numerical methods and physics
knowledge
Test Plan
#
Main Component
Description
Status
1
Catching System
Dissipate Objects Energy from Falling
Open
2
Release Mechanism
Quick Release w/ No Horizontal Motion
Open
3
Tower Frame
Test Tower Stability During Operation
Open
4
Laser Sensor
Best Position to Track Objects Fall
Open
5
DAQ Device
Appropriate Signal is Programmed and Functional
Open
6
Labview Program
Compare Results to Analytical Predictions
Open
7
Pressure Gauge
Calibrate and Test Entire Pressure Range
Open
8
Vacuum Pump
Vacuum Tube
& Fittings
Stationary Platform &
Objects
Attach Pressure Gauge Directly to Pump
Open
Test Ultimate Pressure
Open
Observe Behavior of Objects in Vacuum
Open
9
10
High Leak Rate
Importance
1
Risk Item
Severity
ID
Likelihood
Risk Assessment – High Risk Items
3
2
6
• Improper sensor alignment
• Sensor range inadequate
• Power loss
2
3
6
Effect
•
•
•
Loss of Vacuum
Noisy
Increased depressurize time
Cause
•
•
•
Bad Sealant
Gaps in o-rings
Surface impurities
2
Laser Sensor Looses • Loss of data
Item
(position and time)
3
Unsuccessful
Release of Objects
•
•
•
Items does not fall
Horizontal motion occurs
Unsynchronized release
•
•
•
Mechanism doesn’t open
Release timing off
Loss of power
2
2
4
4
Pipe Implodes
•
•
Safety Hazard
Project ruined
•
•
Pipe wall thickness
Material
1
3
3
Tower Falls Over
•
•
•
Safety Hazard
Damages to Surroundings
Project Ruined
•
•
•
Poorly supported
Earthquake
Weak structure
1
3
3
5
MSD II Schedule
Bill of Materials
Tower Pricing: 6in Diameter-10ft Tall
NOTES: * Sale Price.
Item
Pipe
Union Fitting
Polycarbonate Sheet
Polycarbonate Sheet
Size (in)
6in
6"slip x 6"slip
1/4"
1/2" THK
Item
Range
0 micron - atm; 1/4 SAE F
CPS Vacuum Gauge
Laser Distance Sensor
0.2m - 15m
DAQ
8 Analog inputs
Arduino Uno
Arduino Motor Controller (SAINSMART)
Item
Length
10 ft
n/a
12" x 24"
15 Microns
Item
Brass Connector: SAE x NPT
Brass Adapter: SAE x NPT
Pipe
Hose
Hex Nipple Adapter
Ball Valve
Brass Cross NPT
Pipe Feed Through Fitting
Dimensions
1/4" SAE M - 1/2" MPT
1/2" SAE F - 1/2" MPT
2"
1/2"ID - 5/8"OD
1/2" MPT x 1/2" MPT
1/2" FPT
1/2" FPT
Polycarbonate
Gages, Sensors, & DAQ
Vendor
Part # / Size
Century Tool
VG200
Micro-Epsilon
ILR-1030
National Instruments
Amazon
Amazon
Rating
2 Stage Rotary Pump
** Price and vendor could change based on pipe clarity
Tower Pipes & Fittings & Gaskets
Material
Rating
Vendor
Part #
Clear PVC
SCH40
clearpvcpipe
1395-061
white PVC
SCH40
mc master
4880K311
Voltage
Pump
Flow Rate
110-120V / 220V 50/60Hz
6.25 CFM
Length
n/a
n/a
10 ft
25 ft
1.81"
2 5/16"
n/a
n/a
mc master
Price for 1
$146.45
$545.00
$149.00
$17.50
$10.88
Power Supply
8574K45
Price for 1
$410.40
$88.44
$54.22
Quantity
1
2
1
1
Subtotal:
Price per Qty
$410.40
$176.88
$0.00
$0.00
$587.28
Quantity
Price per Qty
Quantity
Price per Qty
1
$146.45
1
$545.00
1
$149.00
1
$17.50
1
$10.88
Subtotal:
$840.45
Vendor
Part # / Size
Price for 1
120V rms @ 60Hz
CPS products
VP6D
$268.92
Pump Piping, Fittings, and Hose
Rating
Vendor
n/a
fastenal
n/a
fastenal
SCH40
lowes
29.9"Hg Vacuum
mc master
1200PSI
fastenal
29.9"Hg Vacuum
mc master
1200PSI
fastenal
Material
brass
brass
White PVC
Polyethlene
brass
brass
brass
Part # / Size
Price for 1
69535
$3.69
440292-131280
$4.61
23832
$6.97
50375K51
$8.00
440049-131280
$5.33
47865K23
$9.84
440095-131280
$19.09
$25.00
1
Subtotal:
$268.92
$268.92
Quantity
1
1
1
1
2
2
1
1
Subtotal:
Price per Qty
$3.69
$4.61
$6.97
$8.00
$10.66
$19.68
$19.09
$25.00
$97.70
Bill of Materials
Item
Square Metal Tubing
3/16" Sheet
Plug Caps for Aesthetics
Riser Clamp (Includes Bolts)
Wheels
Axels
Bolts, washers, nuts
M5 bolts
M5 nuts
Bolts
Barrel screw
Washers
Nuts
Thumb screw
Wing nut
Height Adjustors
Size (in)
1-1/2 X 1-1/2 x .12thk x 12ft
30" x 30"
1-1/2 x 1-1/2
6"
4"
4"
1/2-13 x 2.5"
40 mm
M5
1/4-20 x 2.5in
1/4-20 x .5in
1/4-20
1/4-20
6-32
6-32
M6
Frame Components
Vendor
Part # / Size
Klein
Klein
mc master (50 pk)
9565K29
Fastenal
$49,140.00
mc master
2319T11
mc master
23595T45
RIT
Lowes (4 pk)
91280A240
Lowes (4 pk)
$138,357.00
mc master (25 pk)
91309A552
mc master
92463A403
RIT
RIT
mc master
94567A270
Lowes (3 pk)
$58,091.00
mc master
62805k49
Dimension
7.487"x .103"
48DP, 60Tooth
48DP, 20Tooth
3/16" x 5"
50ft
#4-40 x.5"
#8-32 x 1.75"
n/a
3001HB
Release Mechanism
Vendor
Material
Rubberstore
servocity
plastic
servocity
plastic
servocity
Steel
servocity
RIT
RIT
amazon
n/a
pololu
Price for 1
$22.14
$40.00
$9.32
$25.37
$14.31
$6.24
$0.00
$0.80
$0.68
$3.78
$2.72
$0.00
$0.00
$1.47
$1.18
$2.36
Quantity
4
1
1
3
2
2
1
1
1
1
1
1
6
Shipping
Price per Qty
$20.00
$108.56
$0.00
$40.00
$0.00
$9.32
$0.00
$76.11
$0.00
$28.62
$0.00
$12.48
$0.00
$0.00
$0.00
$0.80
$0.00
$0.68
$0.00
$3.78
$0.00
$2.72
$0.00
$0.00
$0.00
$0.00
$0.00
$1.47
$0.00
$1.18
$0.00
$14.16
Subtotal:
Item
O-ring (AS568-169)
Servo Pinon
Gear
Shaft
Servo wires
Cap Head Bolt
Cap Head Bolt
on/off Switch (for release mech.)*
Servo
Part # / Size
RSA48-2FS-60
SPBD48-23-20
634122
n/a
Price for 1
$1.00
$5.60
$1.56
$0.79
$12.95
$0.00
$0.00
$6.73
$9.95
Quantity
2
2
2
2
2
18
8
1
2
Subtotal:
$299.88
Price per Qty
$2.00
$11.20
$3.12
$1.58
$25.90
$0.00
$0.00
$6.73
$19.90
$70.43
Bill of Materials
Misc.
Item
Polystyrene Beads
Computer
Ladder
PTFE Pipe tape
Clear Cement/Glue
Vacuum Sealant
Final Total:
Dimension
3 ft3
n/a
6ft
50ft roll
1 quart
n/a
Vendor
Material
Hayneedle
Polystyrene
n/a
n/a
RIT
aluminum
mc master
PTFE
pvcfittingsdirect
Clear Cement
Ideal Vacuum products
thermal-plastic
Part # / Size
HN-CT110
n/a
n/a
4591K13
n/a
n/a
Price for 1
$29.99
$0.00
$0.00
$3.05
$38.02
$49.75
Quantity
1
1
1
1
1
1
Subtotal:
Price per Qty
$29.99
$0.00
$0.00
$3.05
$38.02
$49.75
$120.81
$2,285.47
Questions?