Accessible Manufacturing
Equipment Phase 2
Proposal
Team 2
Nicholas Neumann
Ralph Prewett
Jonathan Brouker
Li Tian
Felix Adisaputra
Contents
Introduction
 Background
 Conceptual Design Descriptions
 Proposed Design Solution
 Conclusion

Introduction

Existing Ribbon Cutting Machine

PIC Programming
C
Code
 Timing Loop

Stepper Motors
 Parallel
Operation (Belt)
Cam Motors
 Rotary Cutter
 Stationary and Movable Clamps

Introduction (Continued)

Major Problems

Programming Interface
 Complexity
 Difficult

Maintenance
Stepper Motors
 Inaccuracy
and Inconsistency
 Slow Operation
 Drivers
Heat Issues
Background

Customer Requirements

Programming Interface
 Simplicity
 Easy

Maintenance
Motors
 Precision
and Accuracy
 Variable Speed Control
 Higher Maximum Speed of Operation
Background (Continued)

Primary Objectives

New Programming Interface
 Simplicity
 Future

Improvement
New Motors
 Drivers
 Better
Performance
Background (Continued)

Secondary Objectives

Cutter Replacement
 Noise
Reduction
 Safety Improvement

Rollers Replacement
 Friction

Reduction
Fan Replacement
 Reliability

Aesthetics
 Wire
Harness
FAST Diagram
Open Clamps
Prevent jam
Remove Ribbon
Flick Ribbon
Cut Precisely
Control length
Drive Servo
Display Length
Cut Ribbon
Establish Length
Basic Function
Accept Input
Announce Length
Control Speed
Accept Input
Secondary
Function
Secondary
Function
Secondary
Function
Conceptual Design Descriptions

LEGO Solution

LEGO Mindstorms NXT-G
 Easier
Approach
 Future Improvement

LEGO Servo Motor
 Compatibility
 9V
DC Motor
 Precision and Accuracy
Conceptual Design Descriptions
(Continued)
Conceptual Design Descriptions
(Continued)
Conceptual Design Descriptions
(Continued)

Simplified Code Solution

C Language Code
 Simplification
 Well

Commented
DC Motor
 PID
Controller
Conceptual Design Descriptions
(Continued)

Hybrid Solution

PIC Microcontroller (C Code)
 Audio
 Display

LEGO NXT Brick (Mindstorm)
 Movable
Clamp Control
 Future Improvement

LEGO DC Servo Motor
 Compatibility
 Precision
and Accuracy
Solution Selection Matrix
Importance
Engineering Criteria
●
⃝
Δ
Safety
4
Aesthetics
2
Revisable Software
5
Noise
2
Δ
Δ
Compatibility
3
●
Δ
Mechanical Maintenance
3
Maturity of Technology
4
Robustness
4
TOTALS
●
⃝
Δ
Δ
⃝
●
●
Flipper
5
New Controller Box
Accuracy and Precision
New Cutter
Δ
Safety Guards
●
Connectors
⃝
C++ Code
5
Δ = 1 (Weak)
RobotC
Speed of Operation
⃝ = 3 (Moderate)
LabVIEW
DC Motor
LEGO Mindstorms
Lego Servo Motor
● = 9 (Strong)
Possible Solutions
⃝
●
Δ
●
Δ
Δ
⃝
⃝
⃝
⃝
●
Δ
⃝
⃝
●
101
101
53
39
29
53
●
21
36
40
6
59
Proposed Design Solution

LEGO Solution

LEGO NXT Brick
 Controlling
the DC Motor
 Cutter Mechanism
 Stationary Clamp
 Open/Close Function of the
Clamp’s Jaws

LEGO Servo Motor
 Transporting
Clamp
the Movable
Proposed Design Solution
(Continued)

Length Input
 Current

Buttons Interface with LEGO NXT Brick
7-Segment Display
 Controlled

by PIC to Use Fewer NXT I/O Ports
Audio Output
 LEGO
NXT Brick Sound System
Proposed Design Solution
(Continued)
Cutter Replacement
 Rollers Replacement

 Metal

Rollers
Fan Replacement
 Flipper
Conclusion

Advantages
More Customizable Programming
 Better Accuracy and Precision
 Compatibility

 LEGO
NXT Brick & LEGO Servo Motors
Conclusion (Continued)

Disadvantages

LEGO NXT Brick



Limitation of I/O Ports
Lack of Complex Features in the Compiler
LEGO Servo Motor

Low Overall Torque
Conclusion (Continued)

Project Management Plan

Nicholas
 Programming
Interface
 Sensors

Ralph
 Programming
 Motor

Interface
Drivers
Jonathan
 LEGO
Servo Motor Interface
 Motor Drivers
Conclusion (Continued)

Li
 Flipper
Implementation
 Flipper Interface
 Audio Output

Felix
 Cutter
Mechanism
 Cutter Interface
 7-Segment Display
Conclusion (Continued)
Proposed Budget
Quantity Product Description
Cost
1
LEGO Mindstorms NXT 2.0* $299.99
2
Bronze Rollers
$3.02
1
New Cutter
$30.00
1
Flipper
$5.00
Miscellaneous
$10.00
TOTAL $348.01
*Note: LEGO Mindstorms NXT 2.0 is already provided by our sponsor.
References

LEGO Mindstorms NXT 2.0


http://shop.lego.com/Product/?p=8547
Extreme NXT:

Extending the LEGO Mindstorms NXT to the
Next Level