ShopCalc vs DatumLab

The machinist calculator your shop uses every day — speeds and feeds, tap drill, threading, and conversational G-code, all offline. Stop guessing your speeds and feeds. Stop hunting for the tap drill chart on a greasy notebook page. Stop typing G-code by hand for simple ops. ShopCalc puts every machinist calculation a tap or two away — fully offline, no account, no ads. WHAT'S INSIDE • Speeds & Feeds — RPM, SFM, IPM, IPR for any tool, any material • Tap Drill — UNC, UNF, metric, full chart with class fits • Threading — single-point thread cutting (60° UN, ISO metric, ACME) • Drilling — peck schedules, point lengths, blind-hole depths • Drill Chart — number, letter, fractional, metric — all sizes side-by-side • Boring & Reaming — finish allowance and feed corrections • G-Code Generators — facing, threading, drilling, simple OD/ID • Bolt Circle Generator — XY points + canned cycle for any pattern • Lathe Jaw Bore — soft-jaw boring cycles with spring-pass option • G-Code Reference — quick lookup for G/M codes and program structure • Conversions — feed/speed unit conversions, taper math • Metal Weight — bar stock, plate, tube, by material and shape • Surface Finish — Ra ↔ Rz, common roughness conversions • Tool Library — save your shop's tools, pull settings instantly • Reference — material hardness, common tap sizes, common drill sizes WHO IT'S FOR Manual machinists, CNC operators, programmers, apprentices, hobbyists. If you spend any time at a lathe, mill, or VMC, ShopCalc earns its place on your phone in the first week. FREE vs PRO Free forever: speeds & feeds, tap drill, threading, conversions, drill chart, G-code reference. Pro unlocks G-code generators, bolt circle, jaw bore, tool library, metal weight, surface finish, and the full reference set. One-time purchase or subscription. Subscriptions auto-renew until cancelled. Manage in your Apple ID Subscription Settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://doublevision.company/privacy NO ACCOUNT. NO ADS. We collect usage and purchase analytics and crash diagnostics that are not linked to your identity. ShopCalc works on the floor, in the cab, in a shielded plant. Everything runs locally.

DatumLab is a practical mechanical toolbox for machinists, CNC operators, mechanical designers, and shop-floor technicians. Use it to look up common thread data, calculate ISO fits, estimate speed and feed values, convert shop units, check material references, and save frequently used setups. Core tools work offline, so you can keep working at the machine, in the workshop, or during design review without depending on a network connection. Key tools: Thread calculator for metric, UNC, UNF, BSP, NPT, trapezoidal, and Heli-Coil references Tap drill, clearance hole, pitch, pitch diameter, and minor diameter lookup ISO tolerance and fit calculator for common hole and shaft zones Speed and feed calculations for milling, drilling, tapping, and turning Radial chip thinning and thread turning helpers Unit conversion for length, pressure, torque, speed, force, and mass Material references for common aluminum, steel, stainless, non-ferrous, and plastic materials Weight, bolt preload, and geometry helpers Favorites, recent calculations, custom tools, custom materials, and exportable reports DatumLab is designed for quick reference and setup planning. Values are reference starting points only. Always verify final machining parameters with your tool, machine, workholding, material, and supplier recommendations.