Roughness vs GD&T Check

When it comes to the surface of workpieces, a large number of surface parameters are required in design and manufacture. Before installation or delivery, the workpieces are also verified in quality management. The roughness app from ZEISS provides information on the most common surface parameters with related formulas and graphs.

GD&T Check helps mechanical engineering students validate their Geometric Dimensioning and Tolerancing callouts before submitting CAD drawings. Select a feature type, pick a GD&T symbol, enter your tolerance and datum references, and the app instantly tells you if your callout is valid or invalid — with a specific explanation of what it means and what to fix. CALLOUT CHECKER Build a feature control frame step by step. The app validates your combination against ASME Y14.5-2018 rules and flags errors like missing datum references, incompatible feature types, or incorrect material condition modifiers. PLAIN-ENGLISH EXPLANATIONS Every callout gets translated into a clear sentence explaining what it physically means — no more guessing what a tolerance zone actually controls. SYMBOL REFERENCE LIBRARY Browse all 14 GD&T symbols with definitions, when to use each one, common mistakes, and datum rules. Organized by category: Form, Orientation, Location, Profile, and Runout. SAVED HISTORY Keep a log of every callout you check. Useful as a running reference while working through drawings or homework. Built for students learning GD&T in college-level CAD, manufacturing, and metrology courses. Works fully offline — no account required, no internet needed.