KEVOS® MAKEOS · Manufacturing
Radial Chip-Thinning Feed
How does reduced radial engagement change feed per tooth?
Calculate a geometric chip-thinning correction for a 90° peripheral cutter and supplied maximum chip thickness.
Open the calculatorRuns in your browser. No account needed.
How this tool works
Inputs, units and where to find them
| Input | Unit | Typical source |
|---|---|---|
| Cutter diameter | mm | Effective diameter of a cylindrical cutter with a 90° entering angle. |
| Radial width of cut | mm | Actual radial engagement on a straight peripheral pass, greater than zero and no greater than the diameter. |
| Specified maximum chip thickness | mm | Validated target maximum chip thickness from supplier data or an approved process. |
| Spindle speed | rpm | Proposed speed checked against machine, cutter and workholding limits. |
| Effective cutting teeth | teeth | Effective cutting teeth used in the feed calculation. |
Method and formulas
- Let r = width/diameter. Below r = 0.5, factor = 2√[r(1 − r)]; at or above 0.5, factor = 1.
- Feed per tooth = maximum chip thickness/factor. Table feed = feed per tooth × teeth × RPM.
- Example: 1 mm engagement on a 10 mm cutter gives factor 0.6. A 0.05 mm chip requires 0.083333 mm/tooth, giving 666.667 mm/min with 4 teeth at 2000 rpm.
Limitations
- Straight peripheral milling with a 90° entering angle only. Ball-nose, round-insert, high-feed and changing-engagement paths need other models.
- Very small engagement can request very high feed. Machine dynamics and tool limits still govern.
- No suitable chip thickness is selected and no machine program is issued.
- Default values are worked examples, not recommended settings or material properties.
Typical uses
- radial engagement
- chip thinning
- feed per tooth
Who it is for
- CNC programmers
- Manufacturing engineers
What you get
- Chip-thickness factor
- Corrected feed per tooth
- Calculated table feed
Interpreting the result
- Check corners, entry and increased engagement across the whole path.
- Compare the calculation with supplier limits, then validate the process.
References
- Sandvik Coromant: Milling formulas and definitions — https://www.sandvik.coromant.com/en-gb/knowledge/machining-formulas-definitions/milling-formulas-definitions
- Harvey Performance: How to combat chip thinning — https://www.harveyperformance.com/in-the-loupe/combat-chip-thinning/
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