Arithmos · Volume 1

Arithmos — A 3D-Printed Mechanical Calculator

Landing pad — full build deep dive coming. The working CAD/build artifacts live in 03-outputs/ (drum, pinion, carry-mechanism scripts + render screenshots). This volume will narrate the build.

1.1 The project

Arithmos — Jeff’s from-scratch 3D-printed mechanical adding/calculating machine: parametric drums, pinion teeth, a carry mechanism, engraved digits. (To author: goal, inspiration — including the Curta lineage — and where the design stands.)

1.2 The mechanism

(To author: how the drums + pinions + carry stage work; the tens-carry problem and the chosen solution.)

1.3 Designing it in CAD

(To author: the parametric scripts in 03-outputs/, joint/rabbet strategy, tolerances for printed gears.)

1.4 Build & test

(To author: carry-test rigs, what printed cleanly, what needed iteration — see the session render screenshots.)

  • Curta (the mechanical-calculator that inspires this) — within Calculators.
  • Slide Rules (related analog-calculation instruments).