Engineering · Trainer
GD&T trainer quiz.
Twelve questions on the geometric characteristics, datum rules, and material-condition modifiers of ASME Y14.5-2018. One question at a time, instant feedback, and a one-line explanation for every answer — see how close you are to print-room ready.
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Tip: number keys 1–4 answer the current question. Every answer is checked against ASME Y14.5-2018 and ourGD&T symbols reference.
Why drill this
GD&T fluency is cheaper than a scrapped part.
A feature control frame is a sentence, and misreading one word changes the meaning: confuse circular runout withtotal runoutand a passing journal fails at assembly; miss an Ⓜ modifier and you give away bonus tolerance the designer meant you to have — or claim bonus that isn't there. This quiz drills the misreadings we actually see on incoming prints: datum rules, modifier defaults, and the look-alike characteristics.
Score low on a category? Thefull symbols referencebreaks down all 14 characteristics with examples, and the printablecheat sheetkeeps the chart at the machine. For position work, thetrue position calculatorconverts X-Y deviations to a position diameter — MMC bonus included.
Questions and answers follow ASME Y14.5-2018. Concentricity and symmetry were withdrawn in that revision but still appear on legacy Y14.5-2009 (and earlier) drawings, so they remain in the question pool — flagged as legacy.
Keep exploring
Related tools & references
All 14 characteristics — the ground truth this quiz draws from.
One-page symbol chart for the shop floor or print room.
X-Y deviation to position diameter, with MMC bonus tolerance.
What tight tolerances cost and when GD&T earns its keep.
Drawings full of GD&T? That's our daily work.
Tell us about your part and we'll get back to you promptly. Aerospace, medical, defense, and semiconductor production work welcome.Email CAD models and drawings to sales@digitalmachine.com, including ITAR, EAR, CUI and AS9100 work. Keep controlled technical data out of web forms.
First articles through full production runs