Understanding Your Stone Mill: A Baker's Guide to the Astrie Design
Want to mill your own flour? This tutorial from the École Internationale de Boulangerie unveils the Astrie stone mill, explaining its components and how it works. Learn about the innovative spring-loaded system and the adjustable feeding mechanism for producing high-quality, stone-ground flour. Join us as we explore this fascinating piece of baking equipment!
Welcome to the world of milling your own flour! Many artisan bakers are now choosing to mill their own grain, and that’s a fantastic step towards greater control and flavor in your sourdough. In this tutorial, we'll explore the Astrie stone mill, a compact and efficient option for small-scale flour production. This exploration is brought to us by the École Internationale de Boulangerie, and we’re excited to share their expertise with you.
What is an Astrie Stone Mill?
The Astrie mill, as showcased here at the École Internationale de Boulangerie, is a clever piece of machinery designed to produce high-quality flour from stone-ground grain. Let’s break down its key components and understand how it works.
Key Components of the Astrie Mill
The mill primarily consists of three core sections:
- The Stone Bed & Feeding System: This is the heart of the mill. It features two stone grinding wheels, a hopper (trémie) for grain storage, and a feeding system to control the flow of grain onto the stones.
- Sifting/Burelie: Located centrally, this section screens and separates the milled flour into different grades.
- Packaging: The right side of the mill is dedicated to bagging the finished flour.
Understanding the Grinding Stones
The stones themselves are a fascinating piece of engineering. One stone is fixed (the 'bedstone'), while the other rotates. The Astrie design uses a unique spring-loaded system. This allows the rotating stone to move slightly, mimicking the principles of 'floating stones' used in older milling techniques. This flexibility contributes to a more gentle grinding process, preserving the grain's flavor and nutrients.
The Feeding System: Precision Grain Delivery
Above the stones sits a hopper (trémie) holding around 30 kilograms of grain. A clever system regulates the release of grain, ensuring a consistent feed to the millstones. A small beak, with its adjustable inclination, controls the amount of grain released. This is finely tuned using a simple cord and pulley system – a brilliant example of simple, reliable mechanics!
Adjusting the Mill for Optimal Results
The École Internationale de Boulangerie highlights two key adjustments for this type of mill:
- Grain Flow Rate: The speed at which grain is fed into the mill.
- Pressure Bar Adjustment: Controlling the pressure between the stones using springs and levers.
They also emphasize the importance of leveling the mill itself to ensure smooth operation and minimize vibration. Rubber pads are used to dampen vibrations and reduce noise.
Looking Ahead: Fine-Tuning and Flour Quality
While this video provides a great overview, the École Internationale de Boulangerie plans to release a follow-up tutorial demonstrating the mill in action and delving deeper into the adjustments needed to produce flour of varying qualities. This will cover grain moisture levels and the impact on milling performance.
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