# Worm wheel (helical, non-throated), module 1.5, 30 teeth, helix 5.36° RH, for the 1-start Ø16 worm

> What worm wheel runs with a 1-start, module 1.5 worm?

- Category: Mechanisms › Gears
- Kind: Modern device
- Basis: Xem Studio design following Brown's figure (1868); true size, no printing allowance
- Page: https://xemstudio.com/objects/worm-wheel-helical-m1-5-30t-for-1start-d16/ · JSON: https://xemstudio.com/api/geometry?object=worm-wheel-helical-m1-5-30t-for-1start-d16 · Plain text: https://xemstudio.com/objects/worm-wheel-helical-m1-5-30t-for-1start-d16/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files Xem Studio Design License (free to use and sell from, not to redistribute as files: https://xemstudio.com/license/)
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

## Overall (mm)

| length | width | height |
|---|---|---|
| 47.99 | 47.95 | 10.0 |

**Exact dimensions.** True size, with no printing tolerance added.

## Notes

- Involute helical gear used as a worm wheel: transverse module 1.5 (= the worm's axial module), 30 teeth, helix angle 5.36° right hand (= the worm's lead angle, same hand), normal module 1.49, normal pressure angle 20°; pitch Ø45, tip Ø47.99, root Ø41.27, face 10 mm, Ø8 bore. Centre distance with its worm 30.5 mm, axes crossed at 90°.
- A non-throated worm wheel: worm and wheel are both involute helicoids, so the pair is a crossed-helical gear pair — exactly conjugate at every position, with point contact (a hobbed, throated wheel wraps round the worm and gives line contact; this plain helical form is the one used for light drives and for 3D-printed sets, and it needs no axial positioning).
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

## Sizes

| dimension | value |
|---|---|
| transverse module | 1.5 |
| teeth | 30 |
| helix | 5.36° RH |
| normal module | 1.49 |
| pitch Ø | 45 mm |
| tip Ø | 47.99 mm |
| face | 10 mm |
| bore | Ø8 |
| centre distance | 30.5 mm |

## Where the files are

- Henry T. Brown (1868, public domain): [Five Hundred and Seven Mechanical Movements — scan on archive.org](https://archive.org/details/fivehundredseven00browiala) — web — Publisher's page; dimensions are facts
- 507movements.com: [Brown's movement No. 31: figure, his text and an animation](https://507movements.com/mm_031.html) — web — Publisher's page; dimensions are facts
- Xem Studio: [drawing](https://xemstudio.com/objects/worm-and-worm-wheel-mechanism/) — web — Publisher's page; dimensions are facts

## Free STEP/STL (1 parts, Xem Studio Design License, Xem Studio)

Index: https://xemstudio.com/files/hardware/worm-wheel-helical-m1-5-30t-for-1start-d16/index.json · license: https://xemstudio.com/files/hardware/worm-wheel-helical-m1-5-30t-for-1start-d16/LICENSE.md

- worm-wheel-helical-m1-5-30t-for-1start-d16: [STEP](https://xemstudio.com/files/hardware/worm-wheel-helical-m1-5-30t-for-1start-d16/worm-wheel-helical-m1-5-30t-for-1start-d16.step) · [STL](https://xemstudio.com/files/hardware/worm-wheel-helical-m1-5-30t-for-1start-d16/worm-wheel-helical-m1-5-30t-for-1start-d16.stl) — wheel, axis Z, z 0..10, a tooth centred on +X at z = 0

## Questions

**What worm wheel runs with a 1-start, module 1.5 worm?**

Involute helical gear used as a worm wheel: transverse module 1.5 (= the worm's axial module), 30 teeth, helix angle 5.36° right hand (= the worm's lead angle, same hand), normal module 1.49, normal pressure angle 20°; pitch Ø45, tip Ø47.99, root Ø41.27, face 10 mm, Ø8 bore. Centre distance with its worm 30.5 mm, axes crossed at 90°.

## Fits with

- [Worm and worm wheel, module 1.5, 1-start, 30 : 1](https://xemstudio.com/objects/worm-and-worm-wheel-mechanism/)