NCTune CNC Toolbox
CNC knowledge base
Formulas, terminology and process decisions explained so that a calculator result can be applied deliberately at the machine.
All guides
No universal data tables pretending to replace the tool maker. Every guide moves from definition through calculation to a result check and the matching NCTune CNC Toolbox tool.
Calculate spindle speed from cutting speed and diameter, then machine feed from chip load, flute count and RPM. Includes formulas and an example.
Read guide →02 · CNC guideFeed per tooth vs machine feedUnderstand the difference between fz, fn and vf, convert chip load to machine feed and avoid mixing per-tooth, per-revolution and per-minute values.
Read guide →03 · CNC guideHow to select cutting speed VcChoose a cutting-speed starting point using work material, tool grade, coating, coolant, stability and operation instead of a universal material table.
Read guide →04 · CNC guideClimb vs conventional millingCompare climb and conventional milling by chip-thickness direction, cutting force, backlash, surface behaviour and practical use.
Read guide →05 · CNC guideRadial chip thinning at low aeLearn why low radial engagement reduces actual chip thickness, how the correction is calculated and when not to increase programmed chip load.
Read guide →06 · CNC guideHow to calculate CNC machining timeCalculate ideal cutting time from path length and feed, then include rapid moves, tool changes, dwell and machine dynamics.
Read guide →Most-used tool
Understand the relationship, then calculate your own case.
The cutting parameters calculator converts cutting speed, diameter and fz or fn into RPM, feed and MRR. Advanced functions remain hidden until you need them.