P16482: Breadfruit grinder
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Preliminary Detailed Design

Table of Contents

Team Vision for Preliminary Detailed Design Phase

Goals for this phase:

Prototyping, Engineering Analysis, Simulation

Mass and volume calculations for first auger prototype iteration

We've created a MATLAB code to determine shaking velocity of the agitating design.

Drawings, Schematics, Flow Charts, Simulations

Assembly without frame

Assembly without frame

Support Frame

Support Frame Design

Support Frame Design

Hopper

We determined our original design would be too large and add extra weight. We adjusted the size down from accommodating 4 kg to 1.8 kg of material, which meets the lower end of our requirements. The shaft support bar was edited to fit the dimensions of the smaller hopper design.

Hopper and Shaft Support

Hopper and Shaft Support

We also altered the preliminary agitator design to simplify it and improve its ability to prevent clogging.

The top portion of the hopper shouldn't need agitation, so we focused on agitating the portion directly above the opening to the auger.

Hopper Agitator Design

Hopper Agitator Design

Auger

Based on these calculations, we determined we needed to reduce the volume of breadfruit being fed into the grind stones to prevent overwhelming them.

The key changes include an increased inner diameter, increased number of threads, and a sharp edge to encourage shearing of large breadfruit chunks.

New Auger Design

New Auger Design

Gearbox and Grinding System

We purchased a 2:1 gearbox and modeled it in Solidworks below. Purchasing an existing gear system reduced the time, effort and money required to create the individual parts. It also allows the gears to be enclosed, thereby protecting the flour from coming in contact with them.

We then reworked how this new component would fit into the existing design and determined how it will interface with adjacent parts and drive mechanism.

Assembly of Gearbox with Grind Stones

Assembly of Gearbox with Grind Stones

Collection System Concept

The resultant flour will fall directly into a bucket placed below the stones. For simplicity, we will either have someone agitate the screens on top of the bucket or require sifting by hand.

If we believe we have time and budget available, we've developed a method to agitate the sifting screens and collecting bucket:

Concept Sketch of Collection System

Concept Sketch of Collection System

Collection System Design

Collection System Design

Bill of Material (BOM)

Bill of Materials

Bill of Materials

Risk Assessment

Risk Assessment

Risk Assessment

We've updated our risks.

Design Review Materials

Design Review Notes

Plans for next phase

High level goals:

We've updated our Gantt chart with smaller tasks to make it more useful.


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