Extract Dimensions, Tolerances & GD&T from Technical Drawings
A technical drawing communicates precision through exact notation: "Ø10", "25 ± 0.05 mm", a position callout against datum A. Datafromfile's industrial extraction is built to preserve that notation character-for-character rather than rounding it into a plain number, and to recognize GD&T references where they are clearly legible, flagging, not guessing at, callouts it cannot read with confidence.
Supported document types
- Mechanical part and assembly drawings (PDF exports or scans)
- Drawing title blocks and revision tables
- Dimensioned sketches submitted as photographs
Fields extracted
- Dimension values with tolerance notation intact (e.g. "25 ± 0.05 mm")
- Diameter and radius callouts (Ø, R)
- GD&T characteristic and referenced datum letter, when clearly legible
- Drawing Number and Revision
- Material and Surface Finish notes from the title block
Use cases
- Turning a supplier-submitted drawing into a checkable spec sheet
- Comparing dimensions between drawing revisions (see Compare Revisions below)
- Building a searchable record of drawing specifications across a project
Frequently asked questions
- Does it round tolerance values to make them "cleaner"? No, tolerance notation such as "±0.05" or "H7" is kept exactly as printed, since rounding it would change its engineering meaning.
- What happens if a GD&T callout is blurry in the scan? It is reported as an unclear callout rather than a guessed value. The extraction is an assistant, not a replacement for engineering review.