Creating an assembly sheet in Revit involves two primary steps: first, grouping selected model elements into an assembly, and then generating specialized views for that assembly to place onto a sheet. This process allows you to produce detailed documentation for specific building components, enhancing clarity for fabrication, construction, and quantity take-offs.
Understanding Revit Assemblies
An Assembly in Revit is a collection of selected model elements that are grouped together and treated as a single, manageable unit for documentation purposes. This feature is particularly useful for components that are prefabricated, repeated, or require detailed breakdown for construction.
Why use Assemblies?
- Focused Documentation: Generate views, schedules, and details specific to a component.
- Streamlined Fabrication: Provide clear instructions and part lists for manufacturing.
- Accurate Quantity Take-offs: Easily quantify all parts within a complex component.
- Improved Coordination: Communicate specific details of complex elements to project stakeholders.
Step-by-Step Guide to Creating an Assembly
The first crucial step is to define the assembly itself from your model elements.
1. Selecting Elements for Your Assembly
Begin by selecting all the individual model elements that will form your assembly. This could include:
- A precast concrete panel with all its embedded parts (rebar, lifting anchors).
- A custom curtain wall unit with mullions, panels, and frames.
- A section of a stair with treads, risers, and stringers.
- A complex mechanical or plumbing equipment skid.
How to select:
- Hold
Ctrland click on each element you want to include. - Use a selection window and then filter the selection to include only the desired categories.
2. Creating the Assembly
Once your elements are selected, you can create the assembly:
- After selecting the desired elements, a contextual Modify |
tab will appear in the Revit ribbon (e.g., Modify | Walls, Modify | Mechanical Equipment). - On this tab, locate the Create panel and click the (Create Assembly) button.
- The "New Assembly" dialog box will appear.
- Revit automatically suggests a default Type Name by appending a sequential number to the last assembly type name assigned in the specified naming category. For instance, if you've been creating "Wall Panel" assemblies, it might suggest "Wall Panel 003."
- You have the option to edit this default name to something more descriptive and project-specific (e.g., "Facade Panel Type A," "Precast Beam Assembly B-1," "Unitized Window Assembly").
- Click OK to finalize the assembly creation.
Your new assembly will now appear under the "Assemblies" category in the Project Browser.
Generating Assembly Views for Your Sheet
After creating an assembly, you need to generate specific views that detail its components. These views are essential for populating your assembly sheet.
How to Create Assembly Views
- In the Project Browser, expand the "Assemblies" category.
- Right-click on the specific assembly you just created.
- Select Create Assembly Views.
- In the "Create Assembly Views" dialog, choose the types of views you need from the available options. You can also select a View Template to ensure consistency in scaling, visibility, and graphical representation.
Here's a table outlining common assembly view types:
| View Type | Description | Common Use Case |
|---|---|---|
| Assembly Schedules | Comprehensive lists of all parts, materials, and quantities. | Bill of Materials (BOM), fabrication cut lists. |
| Assembly Elevations | Orthographic views from various sides (Front, Back, Left, Right). | Showing specific details, dimensions, and annotations. |
| Assembly Sections | Cross-sectional views through the assembly. | Revealing internal construction and connections. |
| Assembly 3D Views | Isolated 3D perspective or orthographic views of the assembly. | Providing an overall visual understanding. |
| Assembly Parts List | Lists individual parts along with quantities and materials. | Detailed component breakdown for procurement. |
- Select the desired views and click OK.
- These newly generated views will appear organized under their respective assembly within the Project Browser.
Creating the Assembly Sheet
With your assembly and its associated views prepared, the final step is to create a new sheet and place these views onto it.
1. Creating a New Sheet
- Go to the View tab on the Revit ribbon.
- In the Sheet Composition panel, click the (Sheet) button.
- In the "New Sheet" dialog, select an appropriate title block for your documentation (e.g., A1, A3, specific company title block).
- Click OK.
- A new, blank sheet will be added under the "Sheets (All)" category in the Project Browser.
2. Placing Assembly Views onto the Sheet
- In the Project Browser, expand the assembly you are documenting.
- Expand the list of views under that assembly (e.g., "Wall Panel A - 3D View," "Wall Panel A - Parts Schedule").
- Drag and drop each desired assembly view from the Project Browser onto your newly created sheet.
- Arrange the views on the sheet, adjusting their position and ensuring proper spacing.
- You can activate a view by double-clicking on it on the sheet to make specific adjustments like cropping, adjusting detail level, or adding view-specific annotations.
3. Adding Annotations and Dimensions
- Use Revit's annotation tools (Dimensions, Text, Tags, Keynotes) to add necessary information to your assembly details.
- Ensure all critical dimensions, material call-outs, and explanatory notes are clearly presented.
For more detailed information on creating and managing assemblies, refer to the Autodesk Knowledge Network.
Best Practices for Assembly Sheets
- Consistent Naming: Use a clear and consistent naming convention for your assemblies (e.g., "Precast Panel - Type A," "Curtain Wall Unit - SW Corner").
- View Templates: Leverage view templates to standardize the appearance of your assembly views (scale, detail level, hidden lines, etc.).
- Logical Grouping: Organize your assemblies in the Project Browser in a way that makes sense for your project (e.g., by system, by location).
- Review and Update: Regularly review and update your assembly details as your model evolves to ensure accuracy.
- Layering Information: Start with an overall 3D view, then break it down with elevations, sections, and schedules.
Why Use Assembly Sheets?
Assembly sheets are invaluable for several reasons:
- Enhanced Documentation: Provide focused, component-level details beyond typical floor plans and elevations.
- Improved Communication: Clearly convey complex construction information to fabricators, contractors, and installers.
- Streamlined Fabrication: Offer exact dimensions, material breakdowns, and part lists necessary for off-site manufacturing.
- Accurate Quantity Take-offs: Automatically generate schedules and material lists for precise costing and procurement.
