How do you calculate spindle speed?

For turning applications we do not need this formula since Spindle Speed is usually given in Constant Surface Speed (CSS), which uses SFM value directly. But if you still want to use RPM formula, then diameter value is the actual diameter of work piece. Calculating Spindle Speed (RPM): RPM= 12 x SFM 3.14 x Diameter Click to see full answer. Keeping this in consideration, what is the formula for spindle speed? When maximum speed of the machine spindle less than value of recommended milling conditions Maximum Speed of the Spindle Speed Spindle Speed of Recommended Milling Conditions n min-1 ÷ n1 min-1 how do you calculate cutting speed? Divide by 1000 to change to m from mm. vc (m/min) : Cutting Speed. Dm (mm) : Workpiece Diameter. π (3.14) : Pi. f (mm/rev) : Feed per Revolution. I (mm/min) : Cutting Length per Min. n (min-1) : Main Axis Spindle Speed. h (µm):Finished Surface Roughness. f (mm/rev):Feed per Revolution. RE (mm):Insert Corner Radius. People also ask, how do you calculate spindle speed and feed rate? Given the diameter of the tool and the surface speed, the RPMs of the spindle can be calculated. Then if the tooth load for the cutter is know, and the number of teeth, the feed rate can be determined. Feed Rate Calculator. Units English Surface Speed: (sfm) (See tables below) Spindle Speed (RPM) What is spindle speed?The spindle speed is the rotational frequency of the spindle of the machine, measured in revolutions per minute (RPM). The preferred speed is determined by working backward from the desired surface speed (sfm or m/min) and incorporating the diameter (of workpiece or cutter).