Milling Speeds & Feeds Calculator
Calculate spindle RPM and table feed from cutting speed, tool diameter, flute count, and chip load.
Manufacturing calculators & technical reference
Practical engineering math for the shop floor.
Calculate machining parameters, check fabrication formulas, and understand the assumptions behind each result.
Core calculators
Start with the jobs shops run every day
30 live calculators · 0 in development. Fast inputs, explicit formulas, visible units, and results designed to be checked before they reach a machine.
Drilling RPM & Feed Calculator
Calculate drilling spindle speed, feed per revolution, and penetration rate.
Tap Drill Size Calculator
Estimate starting tap drill diameters for metric and Unified 60-degree cut threads.
Machining Time Calculator
Estimate cycle time from cut length, feed rate, approach, rapids, and tool changes.
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One workbench, six production domains
Calculator guides
Understand the equation before using the answer
Reference notes explain variables, unit handling, assumptions, and practical production checks.
How milling speed and feed calculations work
See how surface speed, cutter diameter, flute count, and chip load become spindle RPM and table feed.
n = (vc × 1000) / (π × D)Metric, UNC & UNF Tap Drill Chart
Look up common cut-tap drill sizes, decimal-inch equivalents, and metric conversions, or open the calculator for custom engagement.
Tap drill ≈ diameter − pitchOpen the printable chart →Heat input and travel-speed assumptions
How voltage, current, travel speed, and process efficiency affect an arc-energy estimate.
H = (η × V × I × 60) / (v × 1000)