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 is calculated using the following formula:
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.
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:
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.
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.
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.
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.