CNC Tools puts 78 machining calculators, reference guides and shop-floor trackers in your pocket. It's built for CNC operators, machinists, setters, programmers and QC inspectors. Every tool works offline, right at the machine. ⚙️ MACHINING CALCULATORS • Spindle speed (RPM), feed rate, cutting speed (Vc) and chip load (fz) • Depth of cut, material removal rate (MRR), power and torque • Tool life by Taylor's equation and surface finish (Ra) estimate • Turning speed & feed, thread cutting, taper turning, parting-off • Boring bar deflection, end mill selection, slot and face milling • Drilling speed & feed and peck drilling cycles 📐 GEOMETRY & PROGRAMMING • Bolt circle (PCD) and hole pattern generator with G-code output • Arc radius & center, chamfer & fillet, tool path length • G-code and M-code reference guides • 2D G-code simulator to preview toolpaths • Tool offset, work offset (G54–G59) and safe Z height • Canned cycle selector and absolute ↔ incremental conversion 🔩 MATERIALS & TOOLING • Hardness conversion (HB ↔ HRC ↔ HV), thermal expansion, material weight • Machinability chart, cutting data finder, density lookup • Insert selection, coating guide (TiN, TiAlN, DLC), tool wear identification • Tool holder compatibility and tool number organizer 📏 QUALITY & INSPECTION • Tolerance and ISO fits & clearances calculator • GD&T symbol quick reference and Go/No-Go gauge limits • Surface roughness chart (Ra, Rz) and measurement uncertainty • Process capability (Cp, Cpk), CMM prep checklist, inspection planner 🏭 PRODUCTION, COST & MAINTENANCE • Cycle time estimator, job cost estimator, cycle time vs cost analysis • OEE and machine utilization calculators • Shift-wise production, target vs actual and downtime analysis • Preventive maintenance scheduler, lubrication tracker, coolant concentration • Warm-up, daily/weekly/monthly and safety lockout checklists • Common CNC alarms decoder, defect diagnosis, tool breakage analysis • Tool life, spare parts and insert consumption trackers • Vendor price comparison, cut optimization, energy consumption ✨ MADE FOR THE SHOP FLOOR • Search any tool instantly by name or keyword • Star your favourite tools and find recently used ones in one tap • Trackers save your entries on your device and can copy them as CSV • Works offline. No sign-in needed. • Light and dark mode ⭐ FREE + PREMIUM 28 tools are free to use. Unlock all 50 premium tools with a one-time purchase. There's no subscription, and it includes lifetime access and future updates. Results are engineering estimates for guidance. Always confirm critical values with your machine manual, tooling supplier data and applicable standards. Have a tool idea or found an issue? Use "Send Feedback" in the app menu.