Blue = DriverGold = Driven / OutputGray = Idler
Overall Gear Ratio
3.00 : 1
Reduction
Output Speed
200 rpm
Ideal rotational speed
Ideal Output Torque
1.50 N·m
Ignoring friction and losses
Output Direction
CCW
1 external mesh
Live calculation
GR = driven ÷ driver = 36 ÷ 12 = 3.00
ωout = 600 × (12 ÷ 36) = 200 rpm
Tout = 0.50 × (36 ÷ 12) = 1.50 N·m
Engineering interpretation
Speed decreases to one-third of the input while ideal torque increases by a factor of 3. One external mesh reverses direction.
Investigation Log
| Trial | System | Driver | Output | GR | Input rpm | Output rpm | Input T | Output T | Direction |
|---|---|---|---|---|---|---|---|---|---|
| Record at least four trials for your worksheet. | |||||||||
Challenge 1 — 3:1 Reduction
Create a two-gear system with a gear ratio of exactly 3.00.
Challenge 2 — Speed-Up
Create a gear pair where output speed is exactly twice input speed.
Challenge 3 — Idler Direction
Build a 3-gear train so the final output rotates in the same direction as the driver.