Bench Math: CNC Calculator

Ten shop calculators that work with no signal. Tap drill sizes, speeds and feeds with chip thinning, bend allowance, and a cut list optimizer that accounts for your kerf.

Bench Math is the arithmetic of a working shop, on your phone, with no signal needed.

Ten tools built for machinists, metal fabricators and woodworkers. No account, no subscription, no internet.

FREE, COMPLETE, NO PURCHASE NEEDED • Tap & Drill: the right drill for common UNC, UNF and ISO metric threads, at any thread engagement, chosen from the drill sets you actually own, plus clearance holes • Board Feet: timber volume and cost, with the quarter sizes yards quote • Right Triangle: solve from any two knowns, for miters, rise and run, bracing

BENCH MATH PRO, ONE PAYMENT • Speeds & Feeds: RPM, feed rate and chip load for 16 materials, including the radial chip thinning correction that most charts leave out • Cut List, linear: nest parts into bar and board stock, kerf accounted for • Cut List, sheet: kerf-aware, grain-aware nesting for plywood and panels, with a cutting diagram • Bend Allowance: flat patterns with K-factor, bend deduction, outside setback • Bolt Circle: X and Y for every hole, ready for a DRO or a G-code file • Belt & Pulley: belt length, ratio and the wrap angle that decides slip • Gear Train: compound ratios, output speed and torque • Saved projects, and PDF or CSV export to hand to whoever is at the saw

BUILT FOR THE SHOP • Works fully offline. Nothing is uploaded, because there is no server • Type fractions the way you write them: 3 1/2, 3-1/2, 7/8, or decimals • Imperial or metric, following your region, and switchable any time • Answers update as you type. No calculate button, no ads • In English, French, Spanish, Japanese and Chinese

HONEST ABOUT WHAT IT IS Speeds, feeds and K-factors are starting points, not specifications. They move with your tooling, your machine and your material. The screens that give those values say so, and tell you to try a test cut or a test bend first.

Bench Math Pro is a one-time purchase, not a subscription. Family Sharing is on.

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