##### Asked by: Kilyan Revathi

asked in category: General Last Updated: 27th June, 2020# How do you calculate spindle speed?

**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 |

Furthermore, 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} |

Also Know, 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.

^{-}

^{1}) : Main Axis Spindle Speed.

Also question is, 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).