English Apple Press — Cross-Section

Turn the screw, watch the pomace compact and the juice run.

Grind fineness (finer = more juice, slower drainage)
Presets
What to try
  1. Raise the pressure from 100 to 200 kPa: how much extra juice, and how much more hand force?
  2. Switch Medium to Fine: more juice, but watch the drainage time constant grow.
  3. Raise friction μ to 0.30: the same pressure needs a larger lever force.
The science

Square-thread power screw with a thrust collar: T = F·k, k = (dm/2)·tan(λ+φ) + μcrc, λ = atan(lead/(πdm)), φ = atan(μ). The plate presses the cake with F = P·A. Hand force at the lever end is T/L.

Juice drains like a first-order process: dV/dt = (V∞ − V)/τ, where the ultimate volume V∞ grows with the peak pressure (1 − e−P/P0) and grind efficiency, and τ grows with cake thickness squared and with pressure as the cake closes its pores. The cake height shrinks as air is squeezed out and juice leaves.

This is a simplified teaching model, identical to the 3D page, not a design guide. Virtual demonstration only — not instructions for building or operating a real press.

Independent numerical checks (run in this page)