Carbide End Mill Speeds and Feeds


The most important aspect of carbide tooling is to run the tool at the proper speeds and feeds.  

We have broken these recommendations down into categories so you can make better decisions with how to run your end mills.  Certain high performance end mills have very specific running parameters relative to their material families.  We have listed these also as individual recommendations. Please check our our website,


When choosing the right parameters to run, most people focus on the speed which relates to the machine RPM.  

This is a mistake!  Focus on on the proper feed per tooth (FPT), and then adjust the speed.  Often when a part is programmed, and is being proven out for production, the programmer will choose conservative parameters and encounter chatter.  Chatter is nothing more that part vibration (noise), because the tool is not cutting properly.  Usually, the first response is to slow the RPM and the chatter will go away.  

This often works, but this is unproductive.  What has just happened is that by reducing the speed and keeping the feed constant, the FPT has increased.  And most likely the FPT before was too low in the first place and that was what caused the chatter. 


1.Choose the material to be machined from the left side of the chart.

2.Choose the correct FPT for that material based on the diameter of your mill. FPT is in inches per tooth (IPT) or millimeters per tooth (MMPT).

3.Choose the proper chip load factor (CLF) based on the radial depth of cut.

4.Now choose the right surface feet per minute (SFM) or surface meters per minute (SMM)

5.Use the SFM and the diameter of the mill to calculate the RPM of your machine.

6.Use the RPM, IPT, CLF and the number of flutes to calculate the feed rate or IPM.

7.If you want to be conservative, choose a slightly lower SFM, but always choose the recommended FPT.

If you follow these guidelines, you will have a much greater success rate in part programming, and you will be more productive.

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