iMachinist is a free Android app developed by wwwSAGITALnet that offers a simple solution to calculate cutting speed, RPM, feed rate, and more for milling, drilling, and turning operations. The app also includes a comprehensive database for hole and shaft tolerances and different threads.

The threads data includes outer diameter (max/min), pitch diameter (max/min), core diameter (max/min), and thread height (max/min) while the tolerance data includes zone (shaft/hole), grade (shaft/hole), and diameter (shaft/hole). The cutting calculator provides fields for tool diameter, cutting speed, spindle speed, number of teeth, feed per tooth, and feed rate.

Overall, iMachinist is a user-friendly app that can be helpful for machinists and engineers in the field of CNC machining.