SfmTurn · workshop
SfmTurn surface speed sfm
Convert diameter and RPM into surface feet per minute before comparing to a tooling chart
TECHNICAL UTILITY · SURFACE_SPEED_SFM
Result
SFM = π × D × RPM / 12
How to use this estimate
Surface feet per minute SFM=π·D·RPM/12 converts diameter (in) and rev/min into ft/min. Units: in × rev/min × π / 12 → ft/min. Out of scope as listed on this page. Screening / idealized model only — not a stamped design.
Sources, methodology, and assumptions
Methodology
Surface feet per minute SFM=π·D·RPM/12 converts diameter (in) and rev/min into ft/min
Units check
in × rev/min × π / 12 → ft/min
Assumptions
Idealized/derived model as scoped; user-supplied inputs.
Out of scope
See MODEL_VALIDITY outOfScope; not a stamped design.
Sources
Unit-context references only — exact model supported by derivation, not org homepages.
Last technically reviewed: 2026-09-11