ADS key terms

The default layer present in every drawing. Objects drawn on it can behave differently inside blocks, and many offices reserve it for block construction rather than visible drawing content.

A saved snapshot of layer settings such as on/off, freeze/thaw, color, linetype, and plot status. Restoring it returns the drawing to that recorded configuration, which is useful for switching between design phases.

A layer property change applied only inside a single layout viewport, leaving the model space appearance unchanged. Common uses include hiding annotation in one view while keeping it visible elsewhere.

A layer whose objects are hidden and skipped during regeneration and plotting. Freezing differs from turning a layer off because frozen content is not recalculated, which speeds up large drawings.

A layer configured so its objects appear on screen but are omitted from plots and published output. Construction lines, reference notes, and viewport frames are typically placed on such layers.

A drawing file saved with preset layers, styles, units, layouts, and title blocks, used as the starting point for new work. Templates enforce office standards from the first object drawn rather than after the fact.

An object whose display size adjusts automatically to the annotation scale assigned to a viewport or model space view. Text, dimensions, and multileaders can all be annotative.

The scale ratio associated with a viewport or model space view that controls how annotative objects are sized. Setting it correctly keeps text and symbols legible at any plotted scale.

A named collection of settings controlling dimension line, extension line, arrow, text, and tolerance appearance. Styles keep dimensioning consistent and can be overridden per dimension when needed.

A dimension linked to the geometry it measures so that editing the object updates the measurement automatically. If the link is lost, the dimension becomes a static, non-updating annotation.

A rule such as parallel, tangent, or coincident that holds drawing geometry in a fixed relationship. Constraints maintain design intent when objects are moved or resized, and they pair with dimensional constraints.

An allowed deviation from a nominal dimension, shown as plus/minus values, limits, or fits. Tolerances communicate manufacturing acceptance criteria and are configured within a dimension style.

A rectangular annotation containing a geometric characteristic symbol, tolerance value, and datum references. It expresses GD&T requirements such as flatness or position on a drawing.

A theoretically exact reference plane, axis, or point from which tolerances are measured. Datum letters appear in feature control frames and tie inspection measurements back to the design.

The stored collection of objects, base point, and name that makes up a block. Editing the definition updates every inserted reference to it, which is the core benefit of block reuse.

An instance of a block definition placed in a drawing, carrying its own insertion point, scale, rotation, and attribute values. Multiple references share one definition, keeping file size down.

A text template attached to a block that prompts for or stores variable data such as part numbers or room names. Attributes can be extracted into tables for schedules and bills of materials.

The process of pulling attribute values from block references into a table, spreadsheet, or file. It is commonly used to generate door schedules, equipment lists, and quantity takeoffs.

A block definition containing parameters and actions that let references stretch, rotate, flip, or switch visibility states. One dynamic block can replace many static variants in a library.

A named configuration inside a dynamic block that controls which geometry is shown. Users pick a state from a grip menu to display different symbols without inserting a separate block.

A link to another drawing file displayed within the current drawing rather than copied into it. Changes to the source file appear on reload, supporting shared base plans across a project team.

An external reference setting that prevents the reference from appearing when the host drawing is itself attached elsewhere. Overlays avoid circular nesting when multiple disciplines share files.

An operation that converts external references into permanent internal blocks so the drawing no longer depends on outside files. Binding is typical before archiving or issuing final deliverables.

A packaged collection of drawings and their dependent files, such as fonts and references, prepared for delivery. Creating one ensures the recipient can open the work without missing links.

A paper space environment representing a sheet, containing a title block and one or more viewports. Each layout has its own page setup, plot scale, and sheet size.

A window on a layout that displays a scaled view of model space geometry. Each viewport can have its own scale, layer overrides, and locked or unlocked panning state.

The ratio between plotted paper units and model space units inside a viewport, such as 1:50. Setting it accurately is essential for correct dimensions and annotation size on the sheet.

A named set of plotting options including printer, paper size, orientation, plot style table, and scale. Applying a saved page setup to several layouts keeps output uniform.

A file mapping object colors or named styles to plotted lineweights, screening, and fill settings. It controls how the drawing looks on paper independently of on-screen display.

The plotted thickness assigned to an object, either directly or through its layer or plot style. Lineweights create hierarchy so that cut elements read heavier than background detail.

A characteristic such as layer, color, linetype, lineweight, or transparency that controls how an object displays and plots. Properties can be set by layer or overridden on individual objects.

A property setting that makes an object inherit its value from its assigned layer. Working ByLayer is a best practice because layer changes then propagate predictably through the drawing.

A dialog that builds a selection set by filtering on object type, property, and value, with options to include or exclude from the current selection. It is faster than picking objects one by one.

A rule set that restricts which objects can be selected or modified, based on type or property criteria. Filters protect critical geometry and speed up editing in dense drawings.

A documented set of rules for layers, text, dimensions, and symbology that all project drawings must follow. Standards support review, coordination, and consistent deliverables across a team.

A file that stores named dimension, layer, linetype, and text styles for automated checking. Audit tools compare drawings against it and report nonconforming items for correction.

A tool that captures a sequence of commands and input as a reusable macro. Recorded actions automate repetitive drafting tasks without requiring programming knowledge.

A plain text file of command-line instructions executed in order to automate a workflow. Scripts are simple to write and useful for batch tasks such as plotting or layer setup.

A dockable interface holding reusable blocks, hatches, and commands that can be dragged into a drawing. Shared palettes give teams one-click access to standard content.

A live connection between a drawing table and an external spreadsheet so values update when the source changes. Data links keep schedules accurate without manual retyping.