FieldengMechanical & Motion
Belt Drive Ratio
Driven pulley speed from pitch diameters, with optional belt slip.
Mechanical & Motion
Driven pulley speed from pitch diameters, with optional belt slip.
App id: MECH-09. Reference version 1.0.
How to fill it
Fill the inputs. The tool shows the outputs.
On the tool screen, Calc is the working sheet. Presets stores values you reuse. Reference is the formula, assumptions, and provenance below.
Formula
N₂ = N₁ D₁ / D₂ × (1 − slip)Inputs
| Name | Unit |
|---|---|
| Driver diameter | mm |
| Driven diameter | mm |
| Driver speed | rpm |
| Slip (optional) | % |
| Measured driven speed (optional) | rpm |
Outputs
| Name | Unit |
|---|---|
| Driven speed (hero result) | rpm |
| Speed ratio N₂/N₁ | 1 |
Diagnose
Observations are context. They do not pass or fail a structure. See Diagnose.
| When | Observation | Severity |
|---|---|---|
reduction ≥ 10 | Extreme ratio | caution |
relative > 0.03 | Belt speed ratio mismatch | caution |
Assumptions
- Leave slip blank for no slip. Slip reduces driven speed.
Provenance
- Open belt drive. Diameters are effective pitch diameters.