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Mockup Review

josew avatar
josew
10 diapositives · 133 Views · Jan 01, 2020

This mockup review focuses on a manioc shredder designed to increase daily productivity of Haitian manioc grating and produce food-quality manioc flour on a portable, individual scale. The critical issues addressed in this mockup include the ability to produce the desired particle size, ability to produce flour, and finding ways to increase throughput, decrease cost, and improve practicality of the mechanical design. The outcomes and achievements of the grater mockup are discussed, along with future steps and lessons learned.

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  1. Mockup Review Manioc Grater Mika Tomczak Steve Amanti Emil CuevasDean Ljubicic Deanna Lentz Sam Felton Chris Rhodes

  2. Purpose of Manioc Shredder • Increase daily productivity of Haitian manioc grating • Produce food-quality Manioc flour • Be used on a portable, individual scale

  3. Critical Issues • Resolved in this mockup: • Ability to produce desired particle size • Ability to produce flour • Remaining challenges • Increase throughput • Decrease cost • Address practicality of mechanical design

  4. Our Challenge: Small Particle Size • Purpose of shredding: to rupture cell walls to release starch granules • Current methods produce strips 1/16”-1/8” thick, 1/4”-1” long • To test whether particles are small enough to grind and sun-dry manioc, observe the consistency of the flour produced, and compare to output of current processes

  5. To achieve smaller particles : Decrease blade thickness (0.125”) Vary teeth height (0.3” , 0.15”) Increase number of blades (6  14) Decrease space between spacers and blades to prevent fall through Smaller Blade Size 1/8 inch

  6. Single-Axle Design Advantages : • Fewer blades / less material required • One axis of rotation – no gear system needed • Disadvantages: • The smaller cutting size is more likely to clog or cake with manioc pulp

  7. Second Stage Screw • Sketch model suggested second stage needed. • Large manioc pieces are put through second stage cranked screw mechanism Outcome: • Production rate: 2.4 kg/hr • 20% increase over traditional methods

  8. Comparing Final Flour Product • Manioc grated by the different methods were dried and crushed to compare flour output • Two-stage method produced flour of comparable size and consistency to old method (although new method seemed to yield smaller particles)

  9. Grater Mockup Analysis Achievements • Appropriately small sized grated manioc produced by reasonable mechanical means. Future Steps • Speed up process to make product commercially viable. • Couple first and second stage mechanisms. • Improve cost efficiency Lessons • Shredding cannot achieve desired particle size in single stage with low precision. • Screw works, but manioc needs preparation stage. • Need more mechanical advantage to increase output speed.

  10. Conclusion Must reconsider the manner in which we rasp manioc if we are going to pursue this idea.