Setup
MillingMaterial
Tool material
Coating
Pass
Work support
Aggressiveness
Hobby-shop defaults. Conservative starts near 55% of book speed — the value most small, lower-rigidity machines actually hold. Open it up by ear once the cut proves quiet.
0
rev / min
Feed & engagement
Rigidity & deflection
Stickout ratio (L/D)
—: 1
Est. tool deflection
—
Going-to-fail checks
Clear
These are starting points, not guarantees. Figures follow Machinery's-Handbook conventions
(RPM = 3.82 × SFM ⁄ D; feed = RPM × chip-load × flutes) with cutting speeds and chip loads seeded from
published tooling-maker data, then derated for hobby rigidity. Real limits depend on your exact tool,
holder, workholding and machine. Ease in, watch chip color and sound, and trust your ears over the number.