Week 8 review

Agenda• Critical Subsystems– Electrical/Mechanical Head Interface Subsystem– Motion Control Subsystem– Storage Subsystem

• Sub-Critical Subsystems • Non-Critical Subsystems

Electrical/Mechanical Head Interface Subsystem Ideas

1 3

42

Electrical/Mechanical Head Interface Subsystem Pugh Chart

P14551 1 2 3 4

EMHI Subsystem Tongue and Solenoid with 2 Alignment Pins

Shaft and Solenoid with 1 Alignment Pinn

Solenoid Driven Locking Arms

Ball Bearing/Roller Bearing Alignment

Parameter Number

Criteria Number

Conceptual Image Judgement Criterion

1 1 Linear Alignment (X,Y,Z) D S - +

2 2 Rotational Alignment A S - +

3 3 Active-off Mechanical Connection T + + +

4 4 Reliability of Electrical Connection U S S S

5 5 Amount of Custom Parts M + - -

6 6 Machining Complexity - - -

7 7 Ease of Servicing Unit + - +

8 8 Complexity of Release Mechanism S - S

9 9 Overall Cost ? - ?

10 10

11 11

12 12

13 13

14 14

Total (+) 0 3 1 4

Total (-) 0 1 7 2

Net Score 0 2 -6 2

Motion Control Ideas

4

31

2

Motion Control Pugh ChartP14551 1 2 3 4

Process Head Storage Subsystem Basic Cartesian Ball & Belt Drive

Basic Cartesian Lead & Chain Drive

Complex Cartesian Ball & Belt Drive Wench - Cable Drive

Parameter Number

Criteria Number

Conceptual Image Judgement Criterion

1 1 Technical Difficulty S - -2 2 Motion System Cost D + - +3 3 Load Bearing Capability S ? -4 4 Accuracy (X) A - S -5 5 Max Drive Speed (X) + S +6 6 Accuracy (Y) T - S -7 7 Max Drive Speed (Y) + S +8 8 Accuracy (Z) U - S -9 9 Max Drive Speed (Z) ? - S

10 10 Maintenance Requirements M - - +11 11 12 12 13 13

14 14

Total (+) 0 3 0 4Total (-) 0 4 4 5

Net Score 0 -1 -4 -1

Storage Subsystem Ideas

1

2

3

4

5

6

Storage Subsystem Pugh Chart

P14551 1 2 3 4 5 6

Process Head Storage Subsystem Horizontal Pins with Z Motion

Horizontal Pins with Spring Loading

Solenoid-Driven Pin Locking (Back Plate)

Solenoid-Driven Pin Locking (Side Plates) Magentic Storage Vertical Pins with Z

Motion

Parameter Number

Criteria Number

Conceptual Image Judgement Criterion

1 1 Required Range of Z Motion D + + + + -

2 2 Complexity of Storage Area Element A - + - + +

3 3 Complexity of Process Head Element T S - + + +

4 4 Machining Complexity U - - S + +

5 5 Estimated Cost M - - - - -

6 6 Added Space Envelope for Storage S - - - -7 7 Stablility Without Power S S S - -8 8 Number of Actuating Elements - - - S S9 9 Precision/Repeatability of storage location - + + S S

10 10 11 11 12 12 13 13

14 14

Total (+) 0 1 3 3 4 3

Total (-) 0 5 5 4 3 4

Net Score 0 -4 -2 -1 1 -1

Sub-Critical and Non-Critical Subsystems

Sub-Critical Subsystems• Enclosure• Safety System• Power Supply• Exact HRMT Design• Computer Controller

Non-Critical Subsystems• User Interface• Bed System