Recommended Speeds for Standard Materials with High Speed Steel Drills Material Recommended speed (SFM) Iron-Cast (Soft) Cast (Medium Hard) Hard Chilled Malleable 75-125 50-100 10-20 80-90 Magnesium and its Alloys 250-400 Monel Metal or High-Nickel Steel, Stainless Steel 30-50 Plastics or Similar Materials 100-300 Click to see full answer. Regarding this, what is the best speed for drilling steel? Drill at a Slow Speed Hard metals like steel and larger drill bits require even slower speeds. With a small twist bit (1/16 in. to 3/16 in.), you can drill through most metals at 3,000 rpm. For larger twist bits (11/16 in. to 1 in.), 350 to 1,000 rpm is recommended.Secondly, how do I know my drill speed? R.P.M. = (3.8197 / Drill Diameter) x S.F.M. S.F.M. = 0.2618 x Drill Diameter x R.P.M. Feeds and Speeds – Formulas. R.P.M. = Revolutions Per Minute I.P.R. = Inches Per Revolution S.F.M. = Surface Feet Per Minute Feed Stroke = Drill Depth + 1/3 I.P.M. = Inches Per Minute Car Reamer = 1/2 Speed of Drill In respect to this, what is a good RPM for a drill? Quick Summary: Some approximate starting advice is to set the spindle speed between 700-1000 rpms for steel, above 2000 for aluminum, and slow down from there if you get discolored chips or heavy drill bit wear.What is drill speed?The speed of a drill is measured in terms of the rate at which the outside or periphery of the tool moves in relation to the work being drilled. The common unit and term for this velocity is surface feet per minute, abbreviated sfm. Every tool manufacturer has a recommended table of sfm values for their tools.
