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the art of technical drawing

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AutoCAD Tutorials

AutoCAD Annotative Scale Explained: Traps and Fixes

August 2, 2026

Annotative scale has been in AutoCAD since 2007 and it is still the thing that most reliably confuses people. The idea is simple. The behaviour, once you have three viewports and an xref, is not. This is what it actually does, why your text disappears, and the handful of traps that account for nearly every complaint about it. What annotative actually … [Read more...] about AutoCAD Annotative Scale Explained: Traps and Fixes

Red-Penning AI AutoLISP: A Line-by-Line Review

July 26, 2026

What this is, and what it is not Ask a chatbot for an AutoLISP routine and you get back something that looks finished. Correct indentation, sensible variable names, a friendly message at the end. It looks like code that has been through a review. So let us actually put it through one. Below is a routine of the kind these tools produce for a steel detailing job — tag the … [Read more...] about Red-Penning AI AutoLISP: A Line-by-Line Review

CS Hatch Library – 132 Free .PAT Downloads

July 26, 2026

A grid of previews from the CS hatch pattern library

The largest collection in the library at 132 patterns, spanning tiling and paving, roofing, metals and plate, insulation, ground surfaces and a broad run of geometric fills. It is worth a browse even if you know what you came for - there is a lot in here that does not turn up in the standard AutoCAD pattern list. Every pattern is a separate download. Each pattern is a … [Read more...] about CS Hatch Library – 132 Free .PAT Downloads

Decorative Hatch Patterns – 53 Free .PAT Downloads

July 26, 2026

A grid of decorative hatch pattern previews

A decorative and ornamental set - relief motifs, repeating figures and border patterns of the kind used on feature panels, screens and detail drawings rather than as general area fill. These definitions were stored inside a text file rather than a .PAT, so they have been effectively invisible for years. Each one is now separated out with its own preview and … [Read more...] about Decorative Hatch Patterns – 53 Free .PAT Downloads

Architectural Hatch Patterns – 46 Free .PAT Downloads

July 26, 2026

A grid of architectural hatch pattern previews

An architectural set: wall and floor finishes, ground and site surfaces, material indications and a few oddities that have clearly been somebody's private joke over the years. As with the rest of the library, every pattern is shown as it will actually hatch and comes as its own download. Each pattern is a separate download containing a single .PAT file — take the … [Read more...] about Architectural Hatch Patterns – 46 Free .PAT Downloads

CAD Hatch Patterns – 57 Free .PAT Downloads

July 26, 2026

A grid of CAD hatch pattern previews - brick, concrete, insulation and tiling

A general construction set covering most of what turns up on a working drawing: brickwork and paving bonds, concrete and aggregate fills, insulation batts, tiling, roofing and metal plate. Each pattern is a separate download, so you can take the two or three you actually need rather than loading a whole library into your support path. Each pattern is a separate download … [Read more...] about CAD Hatch Patterns – 57 Free .PAT Downloads

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