Solve for any subject variable in bold by entering values
in the boxes on the left side of the equation and clicking the
"Calculate" button. The solution will appear in the box on the right
side of the equation. To enter a value, click inside the boxes
containing the "Enter" prompts. 

Legend:
D  Drill diameter
(in inches) 
Z  Number of flutes 

REVOLUTIONS PER MINUTE (RPM) 
 