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Involute Gear Cutters – Lalson Cutting Tools
Precision Cutting Solutions by LALSON
Involute gear cutters are form-relieved cutters used mainly on milling machines to cut gear teeth by machining out each gap individually — different from hobbing, which is a continuous generating process. Here’s the full picture:
What they are
An involute gear cutter is a disc-shaped (or end-mill type) cutter whose tooth profile is machined to match the exact involute curve of the gear space it’s meant to cut. It’s mounted on a milling machine arbor, and the gear blank is indexed (rotated) tooth-by-tooth between cuts.
Why a “set” of 8 cutters exists
Here’s the catch with involute gearing: the tooth shape changes with the number of teeth, even for the same module/DP and pressure angle. A 12-tooth gear has much more curved (deeper cut) flanks than a 100-tooth gear, which is nearly straight-sided (approaching a rack).
Since it’s impractical to make a separate cutter for every tooth count, standard sets use 8 cutters per module/DP, each covering a range:
Product Details
Cutter Specification — What You Need To Order/Select One
- Module or DP — must match the gear exactly (same rules as hobs)
- Pressure angle — 14.5° or 20° (most common today), must match gear design
- Cutter number (1–8) — based on the number of teeth on the gear you’re cutting
- Bore size — to fit the milling arbor
Practical note
If you’re cutting a gear on a milling machine with a dividing head, the workflow is:
- Calculate module/DP and pressure angle to match the mating gear
- Pick the cutter number from the table above based on tooth count
- Set up indexing (e.g., using a dividing head plate) for the correct number of divisions
- Cut each tooth space, indexing between passes
Product Specification
| Cutter No. Teeth Range | |
|---|---|
| 135 | Rack |
| 55 | 134 |
| 35 | 54 |
| 26 | 34 |
| 21 | 25 |
| 17 | 20 |
| 14 | 16 |
| 12 | 13 |
Why Choose LALSON Annular Cutters?
High precision and accuracy
Premium tool steel construction
Long tool life
Excellent wear resistance
Superior surface finish
Consistent cutting performance
Available in standard and custom sizes
Trusted by global manufacturers
