Inches per Revolution

Machining inches per revolution, abbreviated as IPR, is the distance in inches that a cutting tool travels for each revolution of the spindle during a machining operation.  It is used to determine the feed rate of the cutting tool.  By adjusting the feed rate and spindle speed, machinists can control the IPR to achieve optimal cutting conditions for different materials and machining operations.  Optimizing IPR is crucial for achieving desired surface finishes, extending tool life, and improving overall machining efficiency.  Different materials and cutting tools may require specific IPR settings to achieve the best results

 

Inches Per Revolution formula
\( IPR \;=\;  IPM \;/\; RPM \)
Symbol	English	Metric
\( IPR \) = Inches per Revolution	\(in\;/\;rev\)	-
\( IPM \) = Inches per Minute	\(in\;/\;min\)	-
\( RPM \) = Revolutions per Minute	\(rev\;/\;min\)	-