Double-flank Gear Roll Tester

Selection criteria

Measuring range (module, diameter), resolution, automatic evaluation to ISO 1328-2 / AGMA classes.

Supply chain

Offered by German and US gear-metrology makers and by Chinese instrument makers for small-module gears. It is the practical incoming check for gearbox gears, as composite deviation correlates closely with gearbox noise.

Buyer FAQ

What does a gear roll tester measure?

It meshes the gear under test with a master gear on a floating centre and records the centre-distance change: total composite deviation (Fi″) over one turn and tooth-to-tooth composite deviation (fi″). This quickly shows run-out, size and nicks — the defects that make gearboxes noisy.

Double-flank or single-flank testing — which do motor gearboxes need?

Double-flank (tight-mesh) rolling is the standard 100 % production check for small PM and plastic gears: fast, cheap and good at catching run-out and nicks. Single-flank testing measures transmission error under real working contact and is used for development or for low-noise, high-precision gear sets.

Which standards apply?

Radial composite deviations are defined in ISO 1328-2 (GB/T 10095.2) and AGMA 2015-2. Agree the accuracy grade and the master gear class with your gear supplier, and ask for the roll-test chart with each first-article report.

Where it is used