manufacturing status review - colorado.edu machine/process timeremaining completion date top fixture...
TRANSCRIPT
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ManufacturingStatusReview
Presenting:AnthonyAnglin,LindsayGoldworm,ElizabethLuke,Nicholaus Monahan,MaryScites
OtherTeamMembers:AspenCoates,EmmettBailey,ZachMcConnel,SierraWilliams
Customer:ScottTaylor,
SurreySatelliteTechnologyU.S.
PABAdvisor:JoshStamps,
SierraNevadaCorporationBaffling
BuffsBAFFLING BUFFS
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Overview2Overview Schedule Manufacturing Budget
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Motivation – Star tracker baffles• Startrackersneedtoseedimlightfromdistantstars
• Theycompare whattheyseewithonboardstarcatalogtomakespacecraftattitudeadjustments
• Nearbybodiesemit/reflectstraylightwhichhinders startrackersabilitytoseedimlight
• Bafflesattenuateandeliminatestraylightfromnearbybodies
• Lightweightdeployablebaffleforsmallsats
Overview Schedule Manufacturing Budget
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Project Goals•Developaprototypedeployablebaffleforastartrackertobeusedonasmallsatelliteplatform
•Designandmanufacture adeployablebaffletolimitstraylightintoanopticalsensor
•Developatestmethodologyandinstrumentationsuitetomeasureperformanceofthebaffleforstraylightelimination
•Performthetests forthedeploymentandstraylighteliminationofthebaffle
Overview Schedule Manufacturing Budget
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Smallsatdeployment
Star tracker saturated by sun
Deploy baffle
Excess light attenuated
Star pattern detected and attitude determined
Attitude changed
Project Scope
Y
X
Y
X
Mission CONOPS
Overview Schedule Manufacturing Budget
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Project CONOPS - Deployment
V
Powersenttomotor
PowerScrewRotatesBaffleDeploys
Overview Schedule Manufacturing Budget
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Project CONOPS – Light Attenuation
0degrees 10to15degrees
Morethan30degrees
Sensor
*Intestingthesensorwillnotbedisplacedfromthebaffle
Overview Schedule Manufacturing Budget
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BaffleDeploymentAssembly
PrecisionMicrodrivesDCMotor
PowerScrew
τMOTOR
3-TieredBaffle
FLIFT
KillSwitchAssembly
BatteryPoweredLaser
Photo-transistor
NPNTransistor
5VtoBase
NarrowLightBeam
3VtoCollector
ExternalComponents
PowerSupply
LabVIEWStation
NIUSB-6009DAQ
3VtoMotor
Windings
LightGenerationandDetection
14-BitDigitalVoltage
30V
HamamatsuPhotodiode
Current-to-VoltageOp-Amp
Light
Light
Photo-current64LED
Source
AnalogVoltage
8FunctionalBlockDiagram
Overview Schedule Manufacturing Budget
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•FR1: Baffle shall be deployable
•FR2: Baffle shall fit within volume constraints
•FR3: Baffle shall adhere to mass constraints
•FR4: Baffle shall attenuate light
TIER 2DEPLOYBAFFLE(FR1)
Electronicdeploymentwithawiredconnection
STOWEDBAFFLEVOLUME(FR2)
Constrainedby:125 mmwidth125mmlength50mmheight
BAFFLEMASS(FR3) <300grams
BAFFLELIGHTEXCLUSION(FR4)
30degreelightexclusionangle
Requirements & Levels of Success
Overview Schedule Manufacturing Budget
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Baseline Design From CDR & Major Changes
Tier3
Tier2
Tier1
Vane3
LinearBearing
SteelShaft5/8-20ThreadedRod
PrecisionMicrodrive212-117
Vane2
Vane1
88.25mm
118mm
No Major Structural Changes Between CDR
and MSR
Overview Schedule Manufacturing Budget
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CPEs & Manufacturing ChallengesCPE ProjectIntegration ManufacturingChallenges
Deployment(FR1-3)
• ElectricalInterface• MechanicalIntegration• ManufacturingBaffle Challenges&Tolerances
• PCBcreation• TimeIntensive
LightAttenuation(FR4)
• ManufacturingVaneTolerances• SimulationAccuracy
• Bending/warpingsheetmetal
Testing(FR1&4)
• ElectricalInterface• MechanicalIntegration• ManufacturingTestingParts• Simulation AccuracyandPrecision
• Complex
Overview Schedule Manufacturing Budget
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ScheduleOverview Schedule Manufacturing Budget
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Overall Schedule
13Overview Schedule Manufacturing Budget
- Ordering and Development- Class Deliverable Prep- Class Presentations & Break - Manufacturing- Testing- Critical Path
ManufacturingPrep
BraceManufacturingBaffleManufacturing
VaneManufacturingBaseplateManufacturing
ManufacturingMarginDeployment&StrayLightTesting
ResultCompilation
FinalPresentation
Finals
OrderingParts&Material
TestingStructureManufacturing
CircuitValidation
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Manufacturing Schedule
Overview Schedule Manufacturing Budget
- Ordering and Development- Class Deliverable Prep- Class Presentations & Break - Manufacturing- Testing- Critical Path
OrderingParts&Material
ManufacturingPrep
BraceManufacturing
BaffleManufacturing TestingStructureManufacturing
VaneManufacturingBaseplateManufacturing
ManufacturingMargin
CircuitValidation
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Scheduling Concerns
Overview Schedule Manufacturing Budget
• Parts & Material • Not delivered by start of semester
• Schedule slip• As machining picks up for all of the teams, machines become less
available
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ManufacturingOverview Schedule Manufacturing Budget
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Baffle Overview
17Overview Schedule Manufacturing Budget
Vanes
Top Section
Bottom Section
Middle Section
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In House vs. COTS
18Overview Schedule Manufacturing Budget
Motor Mount
Baseplate
Vanes
Baffle Structure
Bearing ShaftThreaded Rod
Linear Bearing
COTS
Manufactured in House
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Other Pieces
19Overview Schedule Manufacturing Budget
Fixtures (x3)
Spacer
Motor Mount
Baseplate
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Top Section
Main concerns
• Time intensive processes
• Many processes to be completed
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Process Time To completeDrill holes for fixture attachment
1 hr
Use CNC mill to cut outside to size and shape
4 hrs
Use CNC mill to mill large radius circle
8 hrs
Use CNC mill to mill small radius circle (Shelf)
2 hrs
Use CNC mill to drill hole for threading
0.5 hrs
Thread drilled hole 1 hrTOTAL 17 hrs
Overview Schedule Manufacturing Budget
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Vanes
Main Concerns:
• Sheet metal
• Easy to bend or warp
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Operation TimeUse CNC mill for outer diameter
0.5 hr
Use CNC lathe for inner diameter and angle
1 hr
TOTAL 1.5 hrs each
Overview Schedule Manufacturing Budget
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Conclusion - Manufacturing
• Table of Breakdown
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Part Machine/process Time remaining Completion Date
Top Fixture CNC Mill 0 hrs 2/2Middle Fixture CNC Lathe 0 hrs 1/30Bottom Fixture CNC Lathe 0 hrs 1/23Top Baffle Section CNC Mill 17 hrs 3/3Middle Baffle Section CNC Lathe 4 hrs 2/17Bottom Baffle Section CNC Lathe 4 hrs 2/17Vanes (x3) CNC Mill & Lathe 1.5 hrs each 3/3Baseplate CNC Mill 3 hrs 3/3Motor Mount Hand Mill & Metal
Bender0 hrs 1/31
TOTAL 32.5 hrs All Complete By: 3/3
Overview Schedule Manufacturing Budget
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Testing Overview – Light Attenuation
12,069 mm
Light Stand
Table
Table
Rotary Table
Baffle Negative
Laser Pointer in trench
BaffleBase Plate
300 mm115 mm
102 mm
Expe
rim
enta
lly
Det
erm
ined
H
eigh
t
Experimentally
Determ
ined H
eight
Leveling Plate
Overview Schedule Manufacturing Budget 23
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300 mm
40 mm
Placement/Orientation Set-up
Base Plate
Light Stand
Rope
12,069 mm
300 mm
140
mm
Placement
Light Source
10 mm
74 mm74 m
m
20 mm
20 m
m
300 mm300 m
m
180 mm
140
mm
152 mm
102 mm
Orientation
24Overview Schedule Manufacturing Budget
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Calibration Test Tolerances
Part Tolerance RequirementsRope (Distance) ±200𝑚𝑚
changes sun’s arc length by <0.01°Apparent sun diameter = 0.5°
Error: <2%Laser (Orientation) ±20𝑚𝑚 + Manufacturing Error
changes Results Angle by 0.27°Light Attenuation:
Pre-obscuration Margin: 1.1°Obscuration Margin: 9.3°
Overview Schedule Manufacturing Budget 25
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• Support Baffle Structure
• 4 Total Negatives• 2 Symmetrical• 2 Asymmetrical
Negative Support Structure
Overview Schedule Manufacturing Budget
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Motor Controller Circuit• PCB Dimensions:
46 x 49 mm
• One HW5P-1 Phototransistor for BC337 NPN transistor base biasing
• One Jameco 22841 DPDT center-off switch and one 76523 SPST switch for baffle deployment reset
• One IN4007 flybackdiode for NPN transistor protection from inductive kickback
Overview Schedule Manufacturing Budget
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Photodiode Amplifier Circuit
• Single 18 x 18 mm Hamamatsu S1337-21 Photodiode for light detection
• Two 1MW Variable Resistors and one 0.1µF capacitor for amplification tuning and noise filtering
• Copper pours for additional noise reduction
• LM741 Op-Amp for current-to-voltage amplification
• NI USB-6009 DAQ connected to computer station running a LabVIEW voltage module for data collection
• PCB dimensions: 72 x 64 mm
Overview Schedule Manufacturing Budget
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LED Circuit• PCB Dimensions:
152 x 102 mm
• 64 surface mounted LuxeonRebel Color LEDS arranged in an 8 x 8 array
• LED Array Dimensions:74 x 74 mm
• Forty-eight 2W, 2W resistors for power dissipation
• Enlarged thermal pads for heat dissipation (suggested by the manufacturer)
Overview Schedule Manufacturing Budget
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Electronics SummaryMotor Controller
CircuitPhotodiode Amp Circuit
LED Array
PARTS Waiting on Hamamatsuphotodiode –
expected to ship end of February
All parts acquired
All parts acquired
CONCERNS
Small size of phototransistor
makes breadboard testing difficult
None
Heat Dissipation - Mitigated by expanded thermal pads and short-duration power application
Design Rule Check violations -Possible mitigation by recreating footprints manually – potentially very time consuming. Alternative solutions being investigated
PLAN Print PCBs via Advanced Circuits once breadboard testing complete and all DRCs pass. Expected cost $33/board. Expected turnaround 5
business days from order placement. 30
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Conclusion - Testing
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Part Machine/Process
Time To Complete Completion Date
PCB & Laser Support Hand Mill 1 hr 3/10Light Stand Mill 2 hr 3/10Leveling Plate Mill 2 hr (CNC) 4 hr (Hand) 3/103-D Support (x4) CNC Mill 4 hrs 3/17Motor Controller Circuit Outsourcing 5 hrs 3/3Photodiode Amplifier Circuit Outsourcing 5 hrs 3/3LED Circuit Outsourcing 5 hrs 3/3TOTAL 38 hrs 3/17
Overview Schedule Manufacturing Budget
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32Overview Schedule Manufacturing Budget
Budget
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1.4%
Electronics - $37.94Testing Equipment -$587.19Optics - $792.00Stock Metal - $258.80Baffle Add-Ons - $269.32Other - $664.20
Overview Schedule Manufacturing Budget 33
Overall Budget
Sum - $2,609.45
Margin - $2,390.55
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Financial Status
• All items (except 3) have arrived and are currently in team locker� The Si Photodiode, RapidEdge Filter, and the Aeroglaze Coating have
all been ordered and will arrive within the month• Future cost include:
� Re-ordering items/stock material if necessary� Application of coating on baffle� Batteries for laser� Material for black felt tunnel� Material for 3-D support� High density foam from bottle rocket excess supplies
Overview Schedule Manufacturing Budget 34
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Questions?
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Backup Slides
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Project Assumptions & Levels of Success• Design is proof of concept
� Need not be space grade
• Focus on attenuating light from Sun
• Spacecraft will be in L.E.O.
• From spacecraft bus:� Voltage available: 28 V� Current available: 2.5 Amps� Power available: 70 Watts
TIER 1 TIER 2DEPLOYBAFFLE(FR1)
ManualDeployment
Electronicdeploymentwithawiredconnection
STOWEDBAFFLEVOLUME(FR2)
Constrainedby:175 mmwidth175mmlength50mmheight
Constrainedby:125 mmwidth125mmlength50mmheight
BAFFLEMASS(FR3) <500grams <300grams
BAFFLELIGHTEXCLUSION(FR4)
40degreelightexclusionangle
30degreelightexclusionangle
Overview Manufacturing Schedule Budget
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Requirements•FR1: Baffle shall be deployable
• DR1.1: Deployable using 28V � DR1.2: Full deployment ground testing shall be conducted
•FR2: Baffle shall fit within volume constraints
• DR 2.1: Fit within 125x125x50mm box
•FR3: Baffle shall adhere to mass constraints
• DR 3.1: Weight less than 300g
•FR4: Baffle shall attenuate light� DR 4.1: Ground testing shall be done to determine light obscuration
• DR 4.2: 99.9% light attenuation at 30 degrees� DR 4.3: Baffle shall have a Pre-Obscuration angle of ≥ 10⁰
Overview Manufacturing Schedule Budget
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Manufacturing Safety Status
• Risk Mitigation for Machine Shop• Personal protective equipment• Proper clothing• Proper disposal of materials• Clean up after machine use• Supervision of machining where necessary
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Category Breakdown• Electronics
� Includes PC board, resistors, and other small components• Testing Equipment
� Includes LEDS, lasers, and rotary table• Optics
� Includes filter and photodiode• Stock Metal
� Includes Aluminum 2024-T4• Baffle Add-Ons
� Includes thread tap, bearing, shaft, motor, and gear• Other
� Includes epoxy, adhesive, and shipping costs
Overview Schedule Manufacturing Budget 40
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Full Baffle
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Top Tier
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Top Vane
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Middle Manufacturing Brace
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Middle Tier
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Middle Vane
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Bottom Manufacturing Brace
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Bottom Tier
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Bottom Vane
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Spacer for Linear Bearing
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Base Plate
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Sheet Metal Motor Mount
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LED Stand
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Rotary Table Level Table
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CAD Negative
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56Overview Schedule Manufacturing Budget
Baffle FixturesTop Section Middle & Bottom Sections
Machine Time RemainingCNC Mill 0 hrs
Machine Time RemainingCNC Lathe 0 hrs
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57Overview Schedule Manufacturing Budget
Baffle SectionsMiddle Section Bottom Section
Machine Time RemainingCNC Lathe 4 hrs
Machine Time RemainingCNC Lathe 4 hrs
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58Overview Schedule Manufacturing Budget
Baseplate & Motor MountBaseplate Motor Mount
Machine Time RemainingCNC Mill 3 hrs
Machine Time RemainingHand Mill & Metal Bender
0 hrs
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59Overview Schedule Manufacturing Budget
Light Stand & PCB & Laser Support Light Stand PCB & Laser Support
Machine Time Remaining2 hrs
Machine Time RemainingHand Mill 1 hr
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60Overview Schedule Manufacturing Budget
Leveling Plates & 3-D Supports Leveling Plates 3-D Supports (x4)
Machine Time Remaininghrs
Machine Time Remaininghrs
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Orientation Verification
Light Source
Laser Beam
10 mm
74 mm
74 mm
20 mm20
mm𝜃+
300 mm
300 mm
12,069 mm
20 mm
𝜃+ = tan/020
12069𝜃+ = 0.10°
180 mm 40 mm13
0 m
m
𝜃 = 𝜃+ +𝜃6𝜃 = 0.10° + 0.17°𝜃 = 0.27°
𝜃688.25 mm
0.254 mm
𝜃6 = tan/00.25488.25
𝜃6 = 0.17°
152 mm
102 mm
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Need for Black Felt RoomProblem:Dark room has many reflective surfaces• Floor/Ceiling• Walls• Pipes
Solution:Covering Dark room surfaces in black felt, which will help block the reflectiveness of the surfaces underneath
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Placement Set-up11
5mm
140 mm
2x12,069 and 2x12,070 mm
300 mm
300
mm
140 mm
107 mm
115
mm
Light StandBase Plate
RopeHook
2 mm4 mm
4 mm
102.5 mm
102.5 mm
132 mm
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Testing Safety StatusHealth and Safety Equipment and Lab Failure
15% Complete, still compiling hazards
10% Complete, lab design is still changing
Further Steps to Take:• Continue compiling hazards to health and safety as well as
equipment and our lab hallway.• Assemble checklists in parallel with testing procedure.• Delegate out requests for input on failure modes as time demands.• Be pessimistic.• Regularly reach out to the PAB.
Overview Schedule Manufacturing Budget 64
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-The purpose of this structure is to hold the baffle in position for optical testing
-Two Support structure manufacturing methods will be explored
1) A 3D printed design, the Solidworks file was made from the CAD of the baffle itselfwill include pieces that must be cut away2)A high density foam block cut away to fit the baffle and hold it in place
Once one of each is made and checked for accuracy, one of the methods will be chosen to make the remaining 3 support structures
Negative Support Structure
Overview Schedule Manufacturing Budget
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Electronics Overview
Photodiode Amplifier and LED Circuits
Motor Controller Circuit
Overview Schedule Manufacturing Budget
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Maximum Deployment
89 mm88 mm
2 mm
Bottom of laser pointer at maximum
deployment height!
Laser Pointer Laser
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Deployment Test Set Up
Laser Pointer Support
Laser Pointer
Laser Pointer
Laser Pointer Support
Phototransistor
PC Board
“Beam of Light”
“Beam of Light”
PCB Support
PCB Support
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