Feeds & Speeds
- R.P.M. = (3.8197 / Drill Diameter) x S.F.M.
- S.F.M. = 0.2618 x Drill Diameter x R.P.M.
- I.P.M. = I.P.R. (feed) x R.P.M. (speed)
- Machine Time (Seconds) = (60 x Feed minus Stroke) / I.P.M.
Recommended feeds of Various Diameter Drills
Recommended speeds for standard materials with H.S.S. Drills
