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Machinist Math: 6 Numbers Every Shop Uses

Press-brake tonnage, true position, K-factor, Ra-to-Rz, sine bars and drill points — shop-floor math, free.

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1 / 6

Press Brake Tonnage Calculator

Air-bending force from thickness, die opening, bend length and tensile strength — the chart formula every brake operator uses.

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2 / 6

True Position Calculator (GD&T)

Actual true position from X/Y deviations plus MMC bonus tolerance — instant accept/reject against the feature control frame.

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3 / 6

K-Factor Calculator (Sheet Metal)

Reverse-engineer the true K-factor of your material and tooling from one measured test bend — flat length, legs, thickness and radius in; K out.

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4 / 6

Surface Roughness Converter (Ra ⇄ Rz, RMS, N grade)

Convert Ra to estimated Rz, RMS (Rq), micro-inch CLA and the ISO N grade — the cross-reference every drawing review needs.

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5 / 6

Sine Bar Calculator (Gauge Block Stack)

Gauge-block stack height for any angle on a 100/127/200 mm sine bar — h = L·sin θ, with the sensitivity per 0.01°.

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6 / 6

Drill Point Depth Calculator

How much the 118° or 135° drill tip adds to a blind hole — tip height and the total depth to program for full diameter.

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