Cast Salt & Pepper Mills

Industrial Design




Project Overview

Introduction

This project was completed for a class on investment casting. As part of the project, we were required to design and prototype an object that makes use of the investment casting process. The class took me through the entire design process, beginning with market research, initial ideation, model making, and then on to prototyping and branding, before finally presenting my design.

salt pepper grinders

Process

Inspiration and Market Research

The process began with thorough research into existing products on the market. What makes some products successful and others unsuccessful? I read numerous consumer reviews of different pepper grinders on the market to get a sense of what users want.



inspiration

Process

Insights

One of the biggest issues people had with existing products was the excess pepper grinds left behind after use. I looked through eBay and Amazon reviews, and noticed a consistent trend:



pepper grinder

“I keep my grinders in a glass butter dish bottom in the spice cabinet to collect all the stray grinds!”

pepper grinder

“It's a good grinder but if it's not shut properly, it will spill pepper all over the place”

pepper grinder

“Almost any pepper/salt grinder will have some seepage, but I keep mine on a tray to contain it”

Developing a Plan

Mission Statement

Design and prototype a set of high quality salt and pepper mills that make use of a bold, simple visual language. The design will be marketed as an “affordable luxury” item, and will be targeted towards homeowners age 20 to 60.


Criteria:

1. The design will be neutral in color, and fit into a variety of different settings.

2. The design should prevent excess pepper grinds from accumulating where it is placed.

3. The grinder will fit many different hand sizes.



Design Process: Sketches

Initial Ideation

Keeping this problem in mind, I developed a mission statement prior to sketching or model-making that would seek to address the issue.

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Mechanical Design

Internal Components

I used the internal components of an existing product, since most salt and pepper mills use standard sizes. With these dimensions in mind, I was able to build my design around them.

grinder internals
grinder internals
grinder internals

Process

Model-Making Process

In addition to the sketches that I did, I also built many different models. Starting with wood, I eventually used 3D printing to quickly make changes to my design in preparation for mold-making. In order to get my wax investment, I made a mold directly from my final 3D print.



grinder internals
3d print

Step 1: 3D Print Output

"I keep my grinders in a glass butter dish bottom in the spice cabinet to collect all the stray grinds!"

model making

Step 2: Mold Making

"It's a good grinder but if it's not shut properly, it will spill pepper all over the place"

wax output

Step 3: Wax Injection Output

"Almost any pepper/salt grinder will have some seepage, but I keep mine on a tray to contain it"

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The Design

Final Cast Prototype

The final product: a salt and pepper mill set that achieve my design criteria. The issue of residual grinds on the table is solved by simply inverting the design - the grinding end is now facing upward instead of downward.

After hours and hours of sanding and polishing, I had two working salt and pepper grinders. I prototyped the knobs at the bottom through 3D printing, although ultimately I anticipate that they would be injection moulded. Due to the difference in weight between the top portion and the bottom portion, if I had done the project over again, I would’ve swapped the material selection. If the metal portion were on the bottom instead of the top, that would help weigh the grinders down better to prevent tipping over.



salt pepper grinders