TOOLBOX · CNC & MACHINING
Speeds & Feeds Calculator
Turn a material, cutter and operation into practical starting RPM, feed, chip load and engagement—then adjust every value to suit the real machine and setup.
Open calculator ↓01 · JOB & TOOL DATA
Set up the cut.
Material noteUse a positive, continuous cut and avoid dwelling so the material does not work-harden.
Starting-value adjustmentBalanced
Tool geometryExact values can be typed at any time.
Cutting dataSuggested figures stay fully editable.
Starting values only. Always consider tool manufacturer's recommendations, machine rigidity, workholding, tool stick-out and coolant conditions.
TRANSPARENT CALCULATIONS
Know what the numbers mean.
The calculator keeps its working values in metric units, then converts the inputs and outputs when Imperial is selected. Recommendations are manufacturer-agnostic starting points and never lock the editable fields.
Vc is cutting speed in m/min and D is tool diameter in millimetres.
Feed is calculated in mm/min from the exact tooth count and chip load per tooth.
Width of cut is checked against the tool diameter before engagement and milling MRR are shown.
Milling uses the rectangular cut volume. Drilling uses the circular hole area × feed.
Recommendation assumptions
Short, rigid tool stick-out; secure workholding; a reasonably rigid CNC machine; sharp geometry suited to the material; controlled runout; and adequate coolant, air or chip evacuation. Tool steel is assumed annealed or pre-hardened, cast iron means general grey iron, titanium approximates Ti-6Al-4V, and engineering plastics represent common machinable unfilled grades.
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