COFFEE GRINDING GUIDE
Choose the Right Coffee Grinder for Better Extraction
Learn the main grinder characteristics that affect grind consistency and workflow, including grinder type, burr size, burr geometry, grind adjustment and dose delivery.
WHY GRINDING MATTERS
The Grinder Has a Major Impact on Coffee Quality
Grinding coffee beans is a crucial part of achieving the flavour you want from your coffee. The grinder determines how evenly the beans are broken down and how precisely you can adjust the grind for your brewing method.
When choosing a grinder, consider the grinding mechanism, burr size, burr geometry, adjustment system and dosing workflow. These characteristics affect grind consistency, ease of use and how precisely you can dial in your coffee.
Electric Grinders: Burr vs Blade
The two most common electric grinder mechanisms are blade grinders and burr grinders.
For users who prioritise coffee quality, a burr grinder is generally the preferred choice because it produces a more consistent grind. Blade grinders tend to create a wider mix of particle sizes, which can make extraction less predictable.
Burr grinders usually cost more, but their ability to produce a more uniform grind makes them a worthwhile option for users who want greater consistency.
Burr Size
Burr size is one factor to consider when comparing grinders. Larger burrs can grind a given amount of coffee with fewer rotations, which can help reduce heat generated during grinding.
The original guide describes a 40mm conical steel burr as a reasonable starting point and notes that grinders with larger burrs, such as 50mm designs, are often paired with more substantial construction and cutting profiles.
Regardless of burr size, consistent particle size remains important for achieving repeatable extraction.
Conical or Flat Burr?
The original guide highlights different characteristics of conical and flat burr grinders.
Lower-Speed Grinding
Conical burr grinders are described as tending to operate at lower RPM, which can reduce friction and heat during grinding.
Uniform Grind Distribution
Flat burr grinders are described as producing a more uniform grind-size distribution and being well suited to espresso-focused use.
The best choice depends on the grinder design, brewing method and the type of workflow you prefer.
Stepped vs Stepless Grind Adjustment
Fixed Adjustment Positions
A stepped grinder uses defined grind settings. This makes settings easy to repeat and works well for users who prefer clear adjustment positions.
Fine-Tuned Adjustment
A stepless grinder allows very small changes between settings, which can be useful when dialing in espresso or compensating for changes in coffee freshness and extraction.
Auto Timer and Manual Dose
Espresso grinders commonly use either programmable timed dosing or manual dosing to control how much coffee is ground into the portafilter.
Auto Timer Dosing
A timed grinder runs for a programmed number of seconds and stops automatically. Once the timer is calibrated to your target dose, it provides a fast and repeatable workflow for everyday espresso preparation.
Manual Dosing
Manual mode keeps the grinder running only while the control is activated, allowing you to stop when the desired amount of coffee has been ground.
Timed dosing is convenient, but grinding time does not guarantee exactly the same weight forever. Changes in grind size, coffee density, bean freshness and hopper conditions can alter how much coffee is dispensed during the same programmed time. For the best consistency, periodically check the output with a scale and adjust the timer when required.
Doser vs Doserless Grinders
A doser grinder stores ground coffee in a dosing chamber, while a doserless or on-demand grinder dispenses ground coffee directly into the brewing equipment.
Ground Coffee Chamber
A doser can hold ground coffee for later use and may help organise repeated dosing in some workflows.
Grinding on Demand
A doserless grinder sends coffee directly toward the portafilter or brewing equipment and generally involves less stored ground coffee.
SUMMARY
Choose the Grinder That Fits Your Coffee Workflow
The right grinder can make a major difference to extraction consistency. The original guide recommends considering grinder type, burr size, burr geometry, stepped or stepless adjustment and dosing style when comparing options.
If you are choosing a grinder for espresso, focus on consistent grinding and an adjustment system that gives you enough control to dial in your coffee.
