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Custom POM and Nylon Injection Molded Gears
moulded with the tooth profile, bore position and hub geometry repeating shot to shot, verified on T1 before production release.
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Product Overview
We mould injection moulded gears, so the tooth profile, the bore position and the hub geometry repeat from the first shot to the last. Against a machined gear, a moulded gear runs quieter because the tooth flank is formed rather than cut, needs no secondary tooth operation, and can carry the hub, the web, the snap features and the shaft bore in one part.
Material is selected to your drawing and the duty the gear has to survive. The grades below are the ones we run most often for this kind of gear, and any of them can be quoted — we confirm the choice with you at DFM rather than assuming it.
Gear types
- Spur gear discs with knurled rim and rib-reinforced web
- Helical gears with upper and lower hub bosses
- Worm shafts and multi-start worm gear pairs
- Double gears, planet gears and pinion gears
- Internal ring gears and gear segments
Tooling and process
- Gear parameter check and mould flow simulation before steel is cut
- Cavity steel NAK80 or S136, 1 to 16 cavities, hot or cold runner
- Tooth form verified on the T1 samples before production release
- Mould life 500,000–1,000,000 shots with maintenance
Materials
POM, PA66, PBT and PEEK. POM gives the lowest friction and the best dimensional stability, PA66 and PA66+GF30 carry load and heat, PEEK is used where the gear runs hot and dry.
Material is selected to your drawing. The grades listed are the ones we run most often for this type of part; we confirm the choice at DFM rather than assuming it.
Specifications
| Parameter | Value |
|---|---|
| Gear types | Spur, helical, worm, planet, double, internal and segment gears |
| Material | Selected to your drawing. We run POM, PA66, PBT and PEEK for this kind of part and confirm the grade with you at DFM. |
| Module | m0.5 to m3 typical; larger modules quoted on request |
| Accuracy | Tooth profile and bore position verified on T1; grade confirmed at DFM against your drawing |
| Shrinkage | POM 1.8%, PA66 1.8%, PP 1.6% — applied to the tooth form as well as the body |
| Cavity layout | 1 to 16 cavities, set by annual volume and press size |
| Core and cavity steel | NAK80 (HRC 38±2) or S136 (HRC 50±2) |
| Tool life | 500,000–1,000,000 shots on hardened inserts |
| Inspection | CMM and gear tooth check on T1 and per batch on request |
Related Custom Services
- Overmolding a soft-touch or wear layer onto the gear body
- Insert molding of a metal shaft or bush into the gear hub
- Two-shot molding of a gear with a different material web
- CNC machining of sample gears before the tool is cut
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