Drilling formula to find feed rate in inches per minute when given inches per revolution and revolutions per minute.
All data as-is, reference only
This formula converts a feedrate given in inches per revolution (fn) to a feedrate given in inches per minute (fm). This is useful in programming drilling cycles in CNC machines.
![](http://toolnotes.com/wp-content/uploads/2019/01/fm-formula.png)
Note that the symbol for RPM is often n so you may see formulas that use n used instead.
![](http://toolnotes.com/wp-content/uploads/2019/01/feed-per-minute.png)
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