Fiber Stretching Instrument Peggy Brown MAT Design Team University of Idaho

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

Design Solution Mechanical Design features 1.56 pitch screw and backlash system 2.Light weight design Measurement components 3.Load measurement –GSO – 10 load cell –DPM – 3 load cell amplifier and display 4.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 Solution Mechanical Design features 1.56 pitch screw and backlash system 2.Light weight design Measurement components 3.Load measurement –GSO – 10 load cell –DPM – 3 load cell amplifier and display 4.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 features 1.56 pitch screw and backlash system 2.Light weight design Measurement components 3.Load measurement –GSO – 10 load cell –DPM – 3 load cell amplifier and display 4.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 Solution Mechanical Design features 1.56 pitch screw and backlash system 2.Light weight design Measurement components 3.Load measurement GSO – 10 load cell DPM – 3 load cell amplifier and display 4.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, Material and mechanical costs - $ Measurement components - $1, hours of CNC machining 50 hours of manual mill machining Many, many, hours of research, design, and shop preparations.

Questions?