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