For spur, helical, pinion, planetary, internal, compound, worm-wheel, and sector gears.
Balanced / unfilled POM
Key validation: Validate fatigue and dimensional stability at the actual torque, speed and temperature.
A balanced POM option when stiffness, fatigue capability, dimensional control, moldability, and sliding behavior all matter.
It still requires validation at the actual torque, speed, temperature, lubrication condition, and target life.
Wear-resistant or low-friction POM
Key validation: Test the actual mating part and lubrication. Friction data alone does not predict gear life.
Relevant when dry running, flank wear, stick-slip, frictional heat, or noise has been confirmed as the limiting mechanism.
A generic friction result does not predict gearbox life; screen it with the actual mating gear and lubricant.
Reinforced POM
Key validation: Check fiber-related shrinkage and warpage, as well as wear on the mating part.
Relevant when tooth or hub deflection, creep, or structural stiffness is more limiting than surface wear.
Fiber orientation can change shrinkage, warpage, tooth-surface behavior, and counterface wear.
When POM may not fit
High temperature, humidity, chemical exposure, or a defined electrical requirement may move the project outside the practical POM window. In those cases, compare another polymer family instead of forcing POM into the application.
Open the topic that matches your current design or test question.
Wear or debris
Checkpoints: Check actual torque and rpm, tooth temperature, contact pattern, alignment, counterface finish, and lubrication.
Material response: Screen wear-resistant or low-friction POM only when contact behavior remains the limiting factor.
Noise, heat, stick-slip, or binding
Checkpoints: Check backlash, runout, center distance, shaft and housing alignment, hot and cold dimensions, and duty cycle.
Material response: Consider a friction-modified formulation only after geometry, assembly variation, and thermal clearance are separated from material behavior.
Root cracking or broken teeth
Checkpoints: Check the crack origin, peak and stall loads, shock history, root geometry, gate and weld-line position, and molding defects.
Material response: Compare balanced or reinforced POM only after fatigue, stiffness, and overload have been identified as the governing constraint.
Bore, hub, or dimensional variation
Checkpoints: Check interference, hub-web-rim balance, cooling, packing, gating, process history, and cavity-resolved measurements.
Material response: Correct tooling or process variation first; reinforcement can add anisotropic shrinkage and warpage risk.
Load and fatigue
Review continuous, peak, startup, stall, reversing, and shock loads together with tooth-root geometry.
Validate with production-intent geometry, duty cycle, temperature, and expected life.
Speed and frictional heat
Review rpm, continuous or intermittent duty, enclosure, cooling, and tooth temperature.
Track flank wear and temperature during a representative running test.
Contact system
Review mating material, hardness and finish, contact pattern, clearance, and lubrication.
Use the production counterface and lubricant when comparing wear behavior.
Accuracy, environment, and life
Review backlash, runout, tooth accuracy, temperature, humidity, fluids, service life, and noise together.
Confirm performance in the conditioned complete assembly, not from a loose gear alone.
Molded structure
Balance hub, web, rib, rim, and tooth sections to reduce uneven cooling and shrinkage.
Review bore, shaft, press-fit, spline, knurl, and insert stresses with the gear geometry.
Flow and dimensions
Review gate and weld-line position before tooling is frozen.
Set shrinkage compensation, packing, cooling, and inspection timing from the selected material and measured trial parts.
For reinforced compounds, evaluate fiber orientation and cavity-specific dimensional variation.
Molded-part checks
Measure profile, pitch, runout, bore position, backlash, and cavity-to-cavity variation after the agreed conditioning period.
Inspect active flanks, tooth roots, gates, weld-line regions, flash, mismatch, and ejection damage.
Assembly checks
Run with the actual mating gear at representative torque, rpm, temperature, lubrication, and duty cycle.
Track wear, temperature, noise, backlash change, counterface condition, and failure location over the required period.
