p14311: gate review
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DECEMBER 12 T H , 2013
P14311: Gate Review
Agenda
Overview of PCB Isolation Routing System Design 20 minutes
Review of Bill of Materials and Sourcing Status 5 minutes
Review of Technical Action Items from DDR 30 minutes
Team Evaluation and Improvements for MSD II 5 minutes
PCB Isolation Routing System
Mobile Enclosure Assembly
Miscellaneous Electronics
Lighting
Interlock Switch
Emergency Stop Switch
Tower Light
Solid State Relay
Low Voltage Power Supply
Electronic Controls
Box
Controller PCBA
I/O Interfa
ce Board
Motor Drivers PCBA (3)
Cooling Fans
Milling Machine
Assembly
Zen Toolwork
s CNC DIY Kit
Router Support Structur
e
Vacuum Clamp
Assembly
Sacrificial Layer
Registration Pins (2-4)
Pressure Sensor
Air Pressure Solenoid
Router Assembl
y
Router
Collet
Temp Sensor
Shop Vacuum
Computer
Supply/Interconnect
Pressurized Air Line
120 VAC
Power Cord
Vacuum Table
Ducting
Debris Vacuum Ducting
Wiring
User Interface Assembly
PC Monito
rMach3 Interfa
ce
Keyboard Mouse
V00100- PCB Isolation Routing System
V00001- Mill CNC Kit
Electrical/Mechanical Characteristics:
Travel capacity: 7” (X) x 7” (Y) x 2” (Z)
High density PVC frame Steel guide rods with
precision linear bearings Stainless steel M8 x 1.25
lead screws with ball bearing supports
Brass anti-backlash lead screw nuts
Shinano dual shaft NEMA 17 stepper motors
V00006-Router V00005-Specialty Collet
Bosch Colt Variable Speed Router16,000-35,000 rpm
Specialty Collet Kit1/8 in. Precision Grade (PG) Colt collet, nut, wrench, and lubricant Helps decrease TIR
V00035- Router Support Plate
V00036- Router Support Brackets
V00010- Vacuum Table Assembly
Made from aluminum13 x 13 grid patternHoles are ½” spacingSupport brackets inside of table to ensure a flat
surfaceUse RTV sealer during assembly to prevent leaks
V00010- Vacuum Table Assembly
Registration System
Originally Plan: User defined pin locations
Problems with vacuum hole interference
Revised system includes pre-set pin hole locations
V00064- Milling Machine Assembly
V00011- Vacuum System
Shop-Vac 5895400 model Fits nicely into our system design Provides more CFM and Power than Vacuum used for testing Low cost(~ $70)
Purchased: Shop-Vac
Test Vacuum: Rigid
CFM 170 110
HP 4.5 5
Size(gallons) 4 4
Air Watts 290 167
Vacuum Table Ducting
Rigid components supplying vacuum comprised of 1 ½” Schedule 40 PVC pipe and fittings
Adapters from PVC to ¾” NPT to connect to 1” flexible ducting
Flexible ducting attached to vacuum table using ¾” NPT components
PVC and Brass fittings from Home DepotFlexible ducting from anver.com
Debris Vacuum Ducting
Ridgid Components made from off the shelf 1 ½” Schedule 40 PVC pipe and fittings
Adapters from PVC to ¼” NPT to connect to ¼” flexible ducting
Flexible ducting attached mill head to collect debris
PVC and Brass fittings from Home DepotFlexible ducting from anver.com
V00014-Air Solenoid V00026- Pressurized Air Tubing
Safety Devices: V00018- Interlock Circuit
Interlock will stop power to the following devices when door is opened:• Router• Stepper Motors and Drivers• Vacuum• Air Pressure Solenoid
All Logic Systems will remain on
Safety Devices: V00022- E-Stop
When pressed, E-stop will stop power to all devices requiring power except PC
V00046/47- Electronic Controls Box
Mounted on outside of enclosure for maintenance access
Includes: Controller PCBA I/O Interface Board Motor Drivers PCBA (3) Cooling Fans
V00024- Electrical Box Cooling Fans
From calculations, Determined we need ~18CFM to keep box under 100°F.
Selected 2 Comair Rotron 19032622A.10 CFM0.256 in H2O static pressure.$10.50 each
User Interface Assembly
V00019- Mach3 Interface
Open Source software solution
Fully customizable GUI Allows direct import of DXF,
BMP, JPG, and HPGL files through LazyCam
Router Speed Control Video Display of machine Wide variety of wizards
available Supports large files
(10,000,000 lines) Widely used with online
support
Bill of Materials & Budget Analysis
Go to Spreadsheet for Ease of Viewing
Remaining DDR Action Items to Review (add slides where applicable)
Further review of Router support (if necessary)Power SchematicPower Consumption TableI/O Schematic ReviewI/O Signal TableStepper Motor VoltageLow Voltage Power Supply SelectionPressure SensorRelayLimit SwitchesDrawings/Test Plans
Team Improvements for MSD II
Problem: Setting deadlines
Actions for Improvement:• Integrate Project
Schedule into every meeting
• Discipline teams develop “building blocks” (aka schedule work elements)during break, input into MS Project schedule
• Start every meeting with project schedule review to determine if we are on schedule with all tasks
Problem: Communication across disciplines
Actions for Improvement:• Interface Managers will
have more frequent meetings outside of class time to talk about discipline crossover
• Notes will be taken at every meeting, and all team members are required to review notes from a meeting they were not present at prior to next full team meeting
Problem: Poor utilization of MSD Class time
Actions for Improvement:• Streamline meeting
process so only 1-1 ½ hours used on full group meeting
• Continue using agendas • Team members come
prepared for discussions and complete items by deadline
Break Action Items
1. Develop Schedule Work Elements for Master Schedule
2. Complete Purchase Drawings for all remaining Purchase parts
3. Source remaining non-critical items4. Finish refining Test Plans
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