Calculation

Surface Roughness and Feed

Created on · surface-roughness-feed

Estimates geometric surface roughness from feed and tool edge radius or tool diameter.

Process

Feed per cutting edge

Nose radius

Cutter diameter

Practical factor

How to use the result

The calculation describes the specified model. Check the tool, workholding, and machine limits before use.

turning: Rz ≈ f² / (8r)peripheral milling: Rz ≈ fz² / (4D)Ra ≈ 4Rz / (9√3)

Sources: https://www.sandvik.coromant.com/en-gb/knowledge/machining-formulas-definitions/milling-formulas-definitions