Dimensioning RulesThe rules that make a drawing measurable, inspectable and unambiguous.Mechanical EngineeringA drawing is an inspection instruction, not a picture of the part.AlwaysDimension from a functional datumPlace dimensions outside the outlineDimension a feature where it shows bestGive diameter, not radius, for holesKeep one decimal convention per sheetNeverNever dimension to a hidden lineNever close a chain of dimensionsNever repeat a dimension in two viewsNever dimension across section hatchingNever cross extension and dimension linesA closed chain over-defines the part: three dimensions and an overalllength cannot all be met at once.Dimensioning Ruleslearnposters.com
Dimensioning Rules — printable engineering wall chart from LearnPosters. Free vector PDF, US Letter and A4.

What’s on the Dimensioning Rules poster

10 entries in 2 groups.

A drawing is an inspection instruction, not a picture of the part.

A closed chain over-defines the part: three dimensions and an overall length cannot all be met at once.

Questions about the Dimensioning Rules poster

What’s on the Dimensioning Rules poster?
10 entries in 2 groups. A drawing is an inspection instruction, not a picture of the part. Always: Dimension from a functional datum, Place dimensions outside the outline, Dime…; Never: Never dimension to a hidden line, Never close a chain of dimensions, Never rep…. A closed chain over-defines the part: three dimensions and an overall length cannot all be met at once.
Who is the Dimensioning Rules poster for?
Dimensioning Rules belongs to the Mechanical Engineering section rather than to a school year, because engineering is not something one grade owns. Anyone learning cad & drawing can pin it up — a beginner, a student mid-course, or someone revising years later.
When should you use the Dimensioning Rules poster?
Every time you place a dimension, and every time you check someone else's. A wall chart earns its place by being glanceable from where the work is happening, so Dimensioning Rules belongs on the wall where that engineering work actually happens, within glancing distance, rather than filed away.
What other posters go with Dimensioning Rules?
Assembly Drawings, Auxiliary & Detail Views and Choosing Views sit alongside Dimensioning Rules in the Mechanical Engineering section. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.Assembly DrawingsAuxiliary & Detail ViewsChoosing Views
Is the Dimensioning Rules poster free to download and print?
Yes. Dimensioning Rules downloads as a free PDF with no account, no email and no watermark, like everything else in the Mechanical Engineering section. Print as many copies as you like for a home, a classroom, a library or a tutoring group; reselling the file is the only thing the licence rules out.Read the licence
What size does the Dimensioning Rules poster print at?
Dimensioning Rules is a vector PDF laid out for US Letter, and prints on A4 with Fit to page — the same file, no separate download. Because every mark on it is drawn rather than photographed, it stays sharp enlarged to A3, A2 or A1 at a copy shop. Colour carries emphasis only, so a greyscale print of Dimensioning Rules loses nothing.Printing guide

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