What changes the engineering choice
Temperature changes both the dimensions and mechanical response of polymer gears.
As temperature shifts, stiffness, creep tendency and thermal expansion can alter tooth deflection, bore fit and working backlash. The magnitude depends on the specific resin grade and reinforcement.
The most important temperature may not be ambient. A motor, bearing or sliding worm mesh can warm the local housing while the surrounding machine remains cooler. That local gradient can change both gear stiffness and center distance. During validation, place temperature measurement near the gear train and run a duty cycle that resembles actual acceleration, dwell and load rather than a short no-load spin.
Drawing and application data
Define continuous and short-duration temperatures, heat sources near the gear train, duty cycle and whether the housing/shaft materials expand differently.
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A common source of error
Ignoring the housing and shafts can be as misleading as ignoring the gear material because center distance is also temperature-dependent.
How to prove the design
Validate critical fits and mesh clearance across the realistic temperature window, not only at laboratory ambient.
For Temperature Effects on Plastic Gears, record the exact material grade and conditioning/environment used during validation. Material names alone are too broad for a repeat-production acceptance record.
Supplier brief
Before requesting a price for temperature effects on plastic gears, identify the current drawing revision, production quantity, material constraint and the feature that most strongly affects function. Ask the supplier to flag any deviation from those inputs in the quotation so technical alternatives stay visible.
