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MACHINING CALCULATORS

Home>Tools>Machining Calculators

Machining Calculators - Cutting Speed and Spindle Speed

Machining Calculators should be used to calculate what speeds you should be machining your parts at, by taking the material, tool and tool material into account. correctly setting up your tooling and material allows you to maximise machining quality, as well as product quality.

Spindle Speed

Spindle Speed is calculated using the following formula:
Spindle speed equals cutting speed X 1000 divided by pi times tool diameter
Where:
S = Spinde Speed (normally in RPM or RPS)
V = Cutting Speed
D = Diameter of tool or part (depending on milling or turning)
​
The spindle speed formula calculates the recommended rotation speed of the tool or the part involved in the machining.

Spindle Speed Calculator

Diameter
Cutting Speed



Spindle Speed



CalculateClear



Feed Rate

Feed Rate Calculators can be used to find out if the spindle speed is correct for the tool and material you are using. the formula is as below:
Feed Rate equals spindle speed x feed per tooth x number of teeth
Where:
​S = Spindle Speed
f = Feed Per Tooth
N = Number of Teeth
Feed Rate can help you either set the spindle speed, or check the spindle speed is acceptable, a feed rate higher than the recommended will result in poor machining and shorter tool life.

Feed Rate Calculator

Feed Per Tooth
Spindle Speed
No of Teeth


Feed Rate



CalculateClear



Hot metal glowing - thermal expansion

Cutting Speed

Cutting speed may or may not be a factor given to you by the toolmaker, it will depend on the material of the tool and the material of the part to be machined. It may be given to you as a material removal rate (MRR), feed rate, or a feed per tooth, but we'll get to that later.
Cutting Speed equals pi X part Diameter x spindle speed divided by 1000

Cutting Speed Calculator

Diameter
Spindle Speed



Cutting Speed



CalculateClear



Feed Per Tooth

Feed Per tooth is normally a factor you know, however if you are trying to diagnose a poor tool life or work out why your machining quality is low, you may want to check the Feed per tooth is within limits.
feed per tooth equals feed rate divided by spindle speed x number of teeth
Tool Suppliers might give you information on what the recommendations for the tools removal rates when cutting a certain material, however you can often find an estimate by searching for the tool material and part material. an example can be found here.

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Photo used under Creative Commons from markyweiss
  • NEWS
  • Calculators/Tools
    • Inch To Metric Conversion Table
    • Thermal Expansion Calculator
    • Stress, Strain and Young's Modulus
    • Beam Deflection Calculators >
      • Single Load Cantilever Beam Deflection Calculator
      • Single load supported beam deflection calculator
      • Even load cantilever beam deflection calculator
      • Even load supported beam deflection calculator
    • Cutting Speed, Spindle, Feed Rate MRR Calculators
    • Pressure Calculator
    • MTBF, MTTR and Reliability
    • Ohm's Law Calculator
    • Laws of Thermodynamics
    • Heat Transfer >
      • Radiation, Absorbance, Emissivity and Reflectivity
    • Theory of Constraints
    • Entropy and Specific Entropy Calculators
    • Alloying Elements of Steel
  • About
  • Contact Us