Why it matters in the cup.
Coffee glossary
Rotary and Vibratory Pump
Parts that change the shot
What it means
Two common pump types used to generate brewing pressure. Vibratory pumps use an electromagnetic piston and are common in home machines; rotary pumps are quieter and typically found in premium or commercial setups. Pump type influences noise, pressure feel, and serviceability — but it does not override good workflow or a sound recipe.
Keep going
Where this leads
Each one pushes this into the cup, compares it, or helps you act on it.
Before the water hits
Puck
Hardware matters because it shapes the brew environment.
Think of the puck as the extraction environment, not just the spent material left after the shot.
Problems that show up later
Backflushing
Parts stay useful only when they stay clean.
Follow the maker's cleaning schedule and rinse thoroughly after detergent cycles.
How the shot starts
Pre-infusion
See where the component changes the first seconds of flow.
Use pre-infusion to smooth the beginning of the shot, not to compensate for careless preparation.
What people mean when they say "extraction"
Espresso Extraction
Translate parts into what changes in the cup.
Separate extraction from strength in your thinking. One asks how much was dissolved, the other how concentrated the drink feels.