We machine matched worm and wheel sets for 20:1 to 300:1 reduction. Bronze wheels, hardened alloy shafts, ±0.005 mm tolerances, and DFM feedback within 12 hours of your upload.
Most worm drive complaints trace back to a small number of process decisions made long before assembly.
A worm cut with the wrong axial pitch or pressure angle mates badly with the wheel. The contact patch moves to one edge of the tooth flank, load concentrates, and the drive runs hot within minutes. Re-cutting the worm means scrapping both members of the set.
Worm and wheel center distance sets backlash. Miss it by 0.05 mm and the drive either binds or rattles. Either way the wheel wears unevenly and the reduction ratio no longer holds under reversing loads.
Tin bronze and aluminum bronze behave differently against a hardened steel worm. Pick the cheaper one and the wheel becomes the wear part, especially in continuous-duty applications where sliding contact dominates.
Worm gears work on sliding contact, not rolling contact. A soft worm running against a hard wheel will gall. The usual rule is a hardened and ground worm paired with a softer bronze wheel, and that pairing has to be planned at the material stage.
Matching the two members of a worm drive is easier when the same team cuts both.
Worms are turned from alloy steel such as 4140 or 4340, heat treated, then thread ground to final form. Grinding after heat treat is what keeps the axial pitch and pressure angle stable. A worm cut before hardening will move during quench.
For lower-duty drives we can hob and finish turn without grinding. For drives running above roughly 1,000 rpm at the worm, ground threads are the safer choice.
The wheel is cut with a hob that matches the worm's thread form. If both parts come from us, we hold the pair together and check contact pattern on a mating fixture. That avoids the classic problem of two good parts that do not run well together.
Throated wheels are the norm for higher ratios. Straight-faced wheels are cheaper and work fine for light loads and low speeds.
Use this as a starting point. Final geometry depends on load, speed, duty cycle, and lubrication.
| Configuration | Typical ratio | Best for | Watch out for |
|---|---|---|---|
| Cylindrical worm, straight-faced wheel | 5:1 to 20:1 | Light loads, intermittent duty | Lower contact area, faster wear |
| Cylindrical worm, throated wheel | 20:1 to 100:1 | General reduction, continuous duty | Alignment sensitive |
| Ground worm, throated bronze wheel | 20:1 to 300:1 | Higher speed, higher duty | Needs proper lubrication |
| Multi-start worm | 5:1 to 20:1 | Higher speed reduction | Lower self-locking tendency |
| Single-start worm | 40:1 and up | Self-locking, high reduction | Lower efficiency, more heat |
Worm gears sit inside a wider set of gear and shaft work we run every week.
Matched worm and wheel pairs cut together, checked on a mating fixture before shipment.
Hobbed and shaped gears up to 4,000 mm, with grinding for hardened parts.
Cut and lapped pairs for right-angle drives where a worm box is too tall.
Turned and milled to the same datum scheme as the gear, so bearing fits line up.
Case hardening, through hardening, and nitriding arranged with the finishing step in mind.
One set for a test rig or a 10,000-piece run, on the same process and inspection plan.
| Item | Range | Notes |
|---|---|---|
| Maximum part size | 4,000 mm | Larger worms split into sections |
| Tolerance | ±0.005 mm | ±0.0002 in, on critical diameters |
| Thread flank finish | Ra 0.8–1.6 μm | Ground worms, sliding contact |
| Materials | 4140, 4340, 17-4PH, bronze | Other alloys on request |
| Quantities | 1 to 10,000+ | No minimum order quantity |
| Inspection | 100% before shipment | Reports on request |
Held on bore, journal, and center-distance features. That is ±0.0002 in.
Upload a drawing or STEP file and get a quotation plus manufacturability notes within 12 hours.
Once drawings and material are confirmed, cutting can begin within 24 hours.
16 simultaneous 5-axis centers, 16 mill-turn centers, plus lathes and gear cutters.
Measured across shipped lots, with 100% inspection before shipment.
7,600 m² in Dongguan plus a Singapore factory at Joo Koon Circle.
Indexing tables and conveyor drives need repeatable backlash after thousands of cycles.
Small worm boxes in joints need low backlash and quiet running at low speed.
Actuator and steering drives need a documented process chain from bar stock to shipped set.
Positioning drives need smooth motion and a finish that will not shed particles.
A single-start worm commonly lands between 20:1 and 300:1. Ratios above roughly 100:1 are achievable but efficiency drops and heat becomes the limiting factor.
If you need more than 300:1, a two-stage arrangement is usually the better call than pushing one set harder.
The worm. Worm drives work on sliding contact, so a hardened and ground steel worm running against a softer bronze wheel gives the longest life.
Reversing that pairing causes galling, especially at higher sliding speeds.
We hold ±0.005 mm on critical diameters and bores. Center distance in an assembled housing is a different number because it stacks the housing bore tolerances with the gear tolerances.
Send the full assembly drawing and we will check the stack rather than the individual parts.
Yes, if you send the wheel and its measured thread form. We reverse the geometry from the wheel, then cut a worm that produces the contact pattern you want.
Without the mating part, we can only work from the drawing, and the result may need lapping at assembly.
Tin bronze for continuous duty and higher sliding speeds. Aluminum bronze when shock loads are the bigger concern.
If the drive runs dry or with marginal lubrication, neither alloy will save it. Fix the lubrication first.
100% inspection before shipment covers the critical diameters, thread form, and bore fits. Worm and wheel pairs are checked together on a mating fixture for contact pattern and backlash.
Inspection reports are available on request.
One piece for a test rig, up to 10,000+ parts for production. There is no minimum order quantity.
Prototype and production runs use the same process plan, so what passes on the bench will match what ships later.
Yes. Uploads are treated as confidential, and an NDA is available on request before you send drawings.
We can also restrict which engineers see the files if your program requires it.
Upload a drawing or STEP file and get a quotation with manufacturability notes within 12 hours. No minimum order quantity, 100% inspection before shipment.
12-hour quoteNo minimum order100% inspectionNDA on request
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Upload your 3D model or 2D drawing and get a quotation with a free DFM analysis. Maximum processing size 4,000 mm.
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