Practical reference material for machinists — formulas, reference tables, and worked examples covering the most common shop calculations.
The core formulas for spindle speed, surface footage, and feed rate for turning and milling — with worked examples for common materials and practical tips for reading your chips.
Read Article →What tolerance class actually controls, how allowance works, the difference between Class 2 and Class 3, and how metric ISO classes map to their UN equivalents.
Read Article →How thread engagement percentage works, when to deviate from 75%, the difference between cutting and forming tap drill sizes, and reference tables for UNC, UNF, Metric, and NPT.
Read Article →What true position controls, the TP = 2√(ΔX² + ΔY²) formula, and how MMC and LMC bonus tolerance works — with pass/fail worked examples.
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