KEVOS® MAKEOS · Manufacturing
Jaw Clutch Milling Set-up (Dividing-Head Angle and Indexing)
To mill the teeth of this jaw clutch on a dividing head, at what angle do I tilt the head, and what index setting moves from one tooth to the next?
Set-up for milling saw-tooth, V-shaped or straight-sided jaw clutch teeth: the angle to tilt the dividing head so a single- or double-angle cutter forms the tooth faces (as the clutch teeth dividing-head tool), the angle between teeth and the simple indexing setting for the tooth count (as the simple indexing tool), with notes for odd and even tooth counts.
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How this tool works
Inputs, units and where to find them
| Input | Unit | Typical source |
|---|---|---|
| Tooth form | choice | Form of the clutch teeth. |
| Number of teeth | Number of teeth on the clutch. | |
| Cutter angle (single) or included angle (double) | ° | Angle of the single-angle cutter, or the included angle of the double-angle cutter. |
| Dividing head worm ratio | :1 | Worm ratio of the dividing head. |
| Index plates available | choice | Index plates you have. |
Method and formulas
- Saw-tooth: cos α = tan(360° ÷ N) ÷ (2 tan θ); V-shaped: cos α = tan(180° ÷ N) ÷ (2 tan(θ ÷ 2)); straight-sided: head vertical (as the clutch teeth dividing-head tool).
- Angle between teeth = 360° ÷ N.
- Crank turns = ratio ÷ N: whole turns plus holes in a circle where the remainder × circle ÷ N is whole (as the simple indexing tool).
- Example: tilt the head to 27.321° and index 8 whole turns between teeth.
Limitations
- Handbook set-up for the cutter on the clutch centre line.
- Simple indexing only.
- Example values are illustrations. Replace them with values for your actual task.
Typical uses
- Mill a replacement jaw or dog clutch
- Set the dividing head angle for saw-tooth clutch teeth
- Check whether the tooth count can be simply indexed
Who it is for
- Machinists
- Toolroom staff
- Maintenance fitters
What you get
- Dividing-head angle
- Angle between teeth
- Index setting
Interpreting the result
- With straight-sided teeth and an odd count, one pass cuts the sides of two teeth at once.
References
- Machinery’s Handbook, 29th edition (Industrial Press, 2012), printed pp. 2452–2454, 2107–2121. Topic reference; no source tables or recommended settings are reproduced.
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Open the Jaw Clutch Milling Set-up (Dividing-Head Angle and Indexing) calculator
