Transcript Gate Review
P14311: Gate Review D E C E M B E R 1 2 TH, 2 0 1 3 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 Miscellaneous Electronics Lighting Interlock Switch Emergency Stop Switch Tower Light Solid State Relay Low Voltage Power Supply Electronic Controls Box Controller PCBA I/O Interface Board Motor Drivers PCBA (3) Cooling Fans User Interface Assembly Supply/Interconnect Mobile Enclosure Assembly Milling Machine Assembly Zen Router Toolworks Support CNC DIY Structure Kit Shop Vacuum Vacuum Clamp Assembly Computer Air Pressure Solenoid Sacrificial Layer Registration Pins (2-4) Pressure Sensor Router Assembly Router Collet Temp Sensor Pressurized Air Line 120 VAC Power Cord Vacuum Table Ducting Debris Vacuum Ducting Wiring PC Monitor Keyboard Mach3 Interface 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 Router 16,000-35,000 rpm Specialty Collet Kit 1/8 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 aluminum 13 x 13 grid pattern Holes are ½” spacing Support brackets inside of table to ensure a flat surface Use 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 Depot Flexible 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 Depot Flexible 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 CFM 0.256 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 Schematic Power Consumption Table I/O Schematic Review I/O Signal Table Stepper Motor Voltage Low Voltage Power Supply Selection Pressure Sensor Relay Limit Switches Drawings/Test Plans Team Improvements for MSD II Problem: Setting deadlines Problem: Communication across disciplines Problem: Poor utilization of MSD Class time Actions for Improvement: Actions for Improvement: 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 • 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 • 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 Develop Schedule Work Elements for Master Schedule 2. Complete Purchase Drawings for all remaining Purchase parts 3. Source remaining non-critical items 4. Finish refining Test Plans 1.