Which mill is right for your material?
Five mechanisms, five fineness ranges, five trade-offs. This table pulls the numbers straight from each platform's technology page so you can shortlist before reading the full physics.
| Model | Mechanism | Typical fineness | Typical materials | Key trade-off |
|---|---|---|---|---|
| Hammer Mill | Impact + shear | 200 µm – 5 mm | Grain, biomass, ores | Fine screens (<150 µm) blind on moist or greasy feeds |
| Pin Mill | Unrestrained impact | 50 – 300 µm | Sugar, lactose, spices | Abrasive feeds (Mohs >3.5) wear pins fast |
| Jet Mill | Autogenous collision | d90 < 5 µm | APIs, pigments, cosmetics | Needs a steady supply of oil-free compressed air |
| Ball Mill | Tumbling media | 20 – 200 µm | Iron ore, silica, cement clinker | Heavy drum and media demand reinforced foundations |
| Air Classifier | Aerodynamic separation | 2 – 150 µm (cut point) | Cement, talc, recycled plastics | Separates only — needs a pre-milled feed |
Fineness ranges and trade-offs are typical figures drawn from each platform's technology page — consult the linked article for the full physics and specification range.
Match the mechanism to the material
Hammer and pin mills lead on throughput for coarse-to-medium feed, but both hit a physical ceiling: hammer mills lose efficiency below roughly 40 microns d90, and abrasive minerals wear pins fast. Ball mills bring the same tumbling-media reliability to hard, dense ores and cement clinker, at the cost of a reinforced foundation. Jet mills go furthest into sub-micron territory with zero grinding-media contamination, but need compressed-air infrastructure to run. Air classifiers don't grind at all — they sharpen the cut on a pre-milled feed, which is why they're most often paired with one of the other four in a closed loop.
If your target fineness sits below 40–50 microns, start with the Jet Mill or an Air Classifier loop. Above that, the Hammer Mill, Pin Mill or Ball Mill will usually be the simpler mechanical choice, without the compressed-air or classifier-loop infrastructure the finer platforms need.
Read the full physics
Each platform's technology page covers the equations behind these numbers