How to find the right Mechanical Spur Gears AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Mechanical Spur Gears
- Pitch and pressure angle
- Match module/DP and pressure angle (20° or 14.5°) to the mating gear These two values decide whether spur gears mesh at all.
- Center distance
- Standard center distance = (sum of pitch diameters) / 2; profile-shifted gears change this Wrong spacing causes binding or excess backlash.
- Minimum teeth
- Avoid very small standard pinions (roughly under 17 teeth at 20°) unless they are profile-shifted Small tooth counts undercut, which weakens the teeth.
- Bore and hub
- Confirm plain or finished bore, keyway, setscrew and hub length These determine whether the gear fits without machining.
- Material and load
- Use steel for torque, and acetal or nylon for quiet, light-duty or dry running, sized from rated load Spur teeth carry the full load on a few teeth at a time.
Brands that matter
- Boston Gear: Extensive inch-pitch spur gear range.
- Martin Sprocket & Gear: Industrial inch spur gears.
- KHK (Kohara Gear): Metric spur gears in many grades and materials.
- SDP/SI (Stock Drive Products): Fine-pitch instrument spur gears.
- igus: Polymer spur gears for lubrication-free use.
What to avoid
- Measuring a 14.5° gear and buying a 20° replacement.
- Very small standard pinions under load.
- Listings without stated pitch or pressure angle.
Questions
Are module 1 and 24 DP the same?
No. 24 DP is about module 1.06, so they look close but do not mesh properly.