FREE CNC TOOLS · Handy shop-floor utilities
CNC Machining Tools
8 free calculators and reference charts for the shop floor—no sign-up, mobile-friendly, nothing uploaded. Built on the same engineering basis as our 69 technical articles.
Cutting Speed / RPM / Feed Calculator
Enter Vc and cutter diameter to get RPM; enter flute count and fz to get feed rate. Includes a Vc reference table for common materials.
Open tool → CHARTTap Drill Size Chart
Recommended drill sizes for M2–M30 metric coarse/fine threads, with a quick formula and adjustments for hard-to-machine materials.
Open tool → CALCULATORMetal Weight Calculator
Plate / round bar / tube / hex bar × common material densities—essential for stock estimating.
Open tool → CHARTSurface Roughness Chart
Ra / Rz / N grade / ▽ symbol cross-reference plus the Ra range each process can achieve.
Open tool → LOOKUPISO Tolerance Lookup
Enter a size, pick IT5–IT13, and read the ISO 286 standard tolerance value instantly.
Open tool → CONVERTERInch ↔ mm Converter
Two-way conversion plus a 1/64″–1″ fractional-inch table, computed exactly to 25.4.
Open tool → QUICK REFERENCEG-code / M-code List
Quick lookup of common FANUC codes with live search; controller-dialect differences are flagged.
Open tool → CALCULATORTaper Calculator
Compute taper ratio and angle from large/small diameter and length, with a table of common tapers such as 7:24.
Open tool →All tools are free and require no sign-up; calculations run locally in your browser and nothing is uploaded. Engineering data uses standard formulas and common table values, with any approximate conversions clearly flagged; before running, always confirm against your tool supplier's catalog and shop-floor conditions. To be notified when new tools launch or to request one, drop us a message.
TOOLS ARE JUST THE START
Beyond lookups and calculators—let AI turn your drawing straight into a verifiable machining program
BestAI CAM: 2D drawing → 3D model → G-code → cutting simulation → AI dimensional cross-check, with the machinist giving final sign-off.
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