Checker's eye: find standards violations in drawings
About this app
Eight production drawings with built-in standards violations (shaft, flange, bearing cover, lever, threaded bolt, plate, bush, bracket): tap, assign the error type, and the spot repairs itself with the relevant standard. Catalogue of 70 rules on representation, sections, dimensioning, tolerances, surfaces, threads and title block; finish with a checker sheet, deductions and your hit rate.
With explain mode: an AI tutor walks you through the app, points out what matters in the scene and answers your questions.
Reading and assessing drawings
Checking drawings takes a trained eye: is every dimension given exactly once, is the dimension chain open, does the fit carry a tolerance class, are hatching, threads and surface symbols to standard? The app trains exactly that on drawings styled like a CAD drafting output with an ISO 7200 title block.
What the app shows
Shaft with keyway, flange, bearing cover in half section, lever, threaded bolt, plate with hole pattern, bush and bracket. Each drawing hides seven to eight errors from a catalogue of 70 rules on representation, sections, dimensioning, tolerances, surfaces, threads and title block (ISO 128, 129-1, 286, 1101, 21920, 6410).
What you try
Tap a suspicious spot and assign the error type. If both are right, the spot animates into the correct version and a rule card explains the standard. At the end a checker sheet lists deductions by severity, a grade for the drawing and your hit rate.
Frequently asked questions
- What are typical errors in technical drawings?
- Duplicate dimensions, closed dimension chains, fits without tolerance class, hidden edges drawn as continuous lines, inconsistent hatching, wrongly drawn threads and incomplete title blocks.
- What is a closed dimension chain?
- All partial dimensions plus the overall dimension are given, so the part is over-defined; one link must stay open or be shown as an auxiliary dimension in brackets.
- Which standards govern dimensioning?
- The basic rules are in ISO 129-1, tolerances and fits in ISO 286 and ISO 14405-1, geometrical tolerances in ISO 1101.
Subject: Technical drawing
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