Fiber Stretching Instrument

Peggy BrownMAT Design TeamUniversity of Idaho

http://seniordesign.engr.uidaho.eduhttp://www.appl-tech.com

Project Description

Design and fabricate an apparatus capable of stretching a fiber specimen.

Establish and maintain a testing point for a laser.

Measure a uniform load of 5 grams.

Measure the deflection traveled

Be able to withstand a corrosive effect

Design Alternatives: Motion System

Three motion systems were considered for the final design. Each ranges in complexity and price.

Alternative 1

Alternative 3

Alternative 2

Decision Matrix: Motion System

0

1

2

3

4

5

6

Weight 5 -3 4 -3

Concern Precision MachiningRequired

Userability Cost FinalScore

Ra

w S

co

re

left/right handed screw

gear

micrometers

Design SolutionMechanical Design features1. 56 pitch screw and

backlash system2. Light weight designMeasurement components3. Load measurement– GSO – 10 load cell– DPM – 3 load cell

amplifier and display4. Deflection measurement– E6S rotary optical

encoder – ED3 rotary encoder

display counter

1. 56 pitch screw with backlash system

• CNC machined• Left and Right threaded screw• Design used in micrometer • CNC Machined Brass nut and insert

Design SolutionMechanical Design features1. 56 pitch screw and

backlash system2. Light weight designMeasurement components3. Load measurement– GSO – 10 load cell– DPM – 3 load cell

amplifier and display4. Deflection measurement– E6S rotary optical

encoder – ED3 rotary encoder

display counter

2. Light weight design

• Spectroscope specimen platform constraints

• Aluminum 6061 construction

• Frame sides CNC machined to remove excess material

• Weighs 4 pounds

Design Solution

Mechanical Design features1. 56 pitch screw and

backlash system2. Light weight designMeasurement components3. Load measurement– GSO – 10 load cell– DPM – 3 load cell

amplifier and display4. Deflection measurement – E6S rotary optical

encoder – ED3 rotary encoder

display counter

3. Loading

• GS0 10– Full scale value of 10 grams

– Excitation voltage of 10 Vdc

– Output of 1mV/V

• DPM-3– Capable of functioning with

many measurement systems

Design SolutionMechanical Design features1. 56 pitch screw and

backlash system2. Light weight designMeasurement components3. Load measurement• GSO – 10 load cell• DPM – 3 load cell

amplifier and display4. Deflection measurement• E6S rotary optical

encoder • ED3 rotary encoder

display counter

4. Deflection

• E6S– Incremental rotary optical

encoder– 100 counts per revolution

(1:11200 inches : encoder counts in 4x mode)

– Optical disk can be changed for better resolution

• ED3 – Digital encoder counter– Six digit display– Capable of 4x counting

mode

Total Cost - $1,600.00

• Material and mechanical costs - $380.00

• Measurement components - $1,220.00

• 13 hours of CNC machining

• 50 hours of manual mill machining

• Many, many, hours of research, design, and shop preparations.

Questions?