⚙️ TECH READS® — Part 07: Basic Gear Train Module
JIS B1701 Involute Spur Gear Educational Simulation | m = 2.0 mm | α = 20° | 12T → 24T → 16T
JIS B1701 · M2.0 · 20°PA
Gear A — Input 12T (CW)
Gear B — Idler 24T
Gear C — Output 16T
Pitch Circle
Mesh Point
Backlash Gap
⚙️ Simulation Controls
📊 Live Output
Gear A Speed
60 rpm
Gear B Speed
30 rpm
Gear C Speed
45 rpm
Output Torque
1.33 Nm
Gear Ratio A→C
0.75 : 1
Efficiency
98%
📐 Gear Geometry
| Gear | Z | PCD | OD | Root Ø |
|---|---|---|---|---|
| A Input | 12T | 24mm | 28mm | 19.0mm |
| B Idler | 24T | 48mm | 52mm | 43.0mm |
| C Output | 16T | 32mm | 36mm | 27.0mm |
// Gear Ratio (A→C via Idler B)
N_C = N_A × Z_A / Z_C
N_C = N_A × 12 / 16 = 0.75 × N_A
// Torque
T_C = T_A × Z_C / Z_A = 1.333 × T_A
// Center Distances
a_AB = m(Z_A+Z_B)/2 = 36.0 mm
a_BC = m(Z_B+Z_C)/2 = 40.0 mm
N_C = N_A × Z_A / Z_C
N_C = N_A × 12 / 16 = 0.75 × N_A
// Torque
T_C = T_A × Z_C / Z_A = 1.333 × T_A
// Center Distances
a_AB = m(Z_A+Z_B)/2 = 36.0 mm
a_BC = m(Z_B+Z_C)/2 = 40.0 mm
📚 Idler Gear Note: Gear B changes rotation direction and bridges center distance — but does not affect the final speed ratio between A and C.
💾 3D STL Downloads
⬇ Gear A — Input 12T 3,264 tri · 159KB
⬇ Gear B — Idler 24T 6,528 tri · 319KB
⬇ Gear C — Output 16T 4,352 tri · 213KB
✅ JIS B1701 Involute Profile · Bambu / Cura / PrusaSlicer ready