Grinding
Blade grinder
A spinning blade that chops beans rather than grinding them, producing a wide mixture of particle sizes at once.
- Type
- Grinder
- What it is for
- Grinding
- Who needs one
- Most people do not need one
- Materials
- Stainless steel blade, Plastic housing
Safety
Unplug before reaching inside. The blade coasts after the motor stops.
What it is
A blade grinder is a small blender. A blade spins at high speed and smashes beans into whatever fragments happen to result, so there is no setting and no particle size — only how long you ran it for. It is included here because it is the grinder most households already own, and because knowing precisely what it can and cannot do is more useful than being told to throw it away.
How it works
Impact fracture. Fragments that are already small keep being hit, so a longer run produces both more dust and, still, the same large pieces that avoided the blade.
Why people use one
It is cheap, widely sold, and grinds spices well.
What this actually changes
Separated by what it affects, because “improves your coffee” is not something you can act on. Where the evidence is thin or contested, it says so.
Taste
Real differenceReasoned, not measuredNegatively, and unavoidably. Dust and large pieces in the same brew extract to different degrees, so the cup cannot be adjusted towards one or the other.
Consistency
No differenceReasoned, not measuredThere is no setting to be consistent with. Two batches ground for the same time are not reliably the same grind.
Who it is for
Worth having if
- Anyone who owns one already and brews immersion coffee such as French press or cold brew, where the tolerance for uneven grind is widest
Probably skip it if
- Anyone making espresso — a blade grinder cannot produce a usable espresso grind at all
- Anyone making pour-over, where the fines choke the bed and the boulders never extract
- Anyone about to buy their first grinder: a burr grinder, hand or electric, gives a setting that can be repeated
Using it well
- Pulse in short bursts rather than running continuously, and shake the grinder between pulses
- Grind only what you need; the heat generated is real and pre-ground coffee stales fast
- Accept a coarser average and use it for immersion brewing rather than fighting it
Common mistakes
Running it longer to get a finer grind for espresso
Produces dust and heat, and still will not make espresso.
Instead: Blade grinders and espresso are incompatible. Use a pressurised basket with pre-ground coffee, or change grinder.
Cleaning and care
Wipe out with a dry cloth; most are not immersible. Cleaning with rice is a folk remedy; follow the grinder maker's cleaning instructions instead.
What you could use instead
Similar money, and a setting you can repeat and adjust, which a blade cannot give.
How to use it
Step-by-step techniques this equipment is part of.
When it goes wrong
Often used alongside
Other equipment this one is used with, or that the same brewing methods call for.
Drinks it appears in
Drinks that name this equipment, or that are brewed by a method requiring it.