Revit Tip: Pre-link DWG Cleanup Workflow for Revit

Before you link any DWG into Revit, clean the CAD geometry and layers. You’ll prevent bloated files, unstable graphics, broken coordinates, and hours of post‑link troubleshooting.

• Confirm units and origin in CAD
  • Set drawing units (UNITS) and insertion scale; avoid “Unitless.”
  • Move model close to 0,0; reset UCS to World; set BASE to 0,0.
  • If coordinates must be preserved, document them and align with Shared Coordinates later.
• Purge aggressively
  • Use -PURGE (including Regapps), and repeat until nothing remains to purge.
  • Run OVERKILL to remove duplicates and tiny fragments; clean the scalelist (-SCALELISTEDIT R).
  • Delete empty annotation scales and unused linetypes, text styles, and blocks.
• Flatten and simplify geometry
  • Ensure all 2D content is at Z=0 (FLATTEN or set elevation to 0).
  • Convert splines to polylines where practical; simplify dense hatches and gradients.
  • Explode only when it meaningfully reduces complexity; avoid exploding large hatch areas.
• Resolve AEC/proxy objects
  • From Civil 3D/Architecture, export to plain AutoCAD geometry (EXPORTC3DDRAWING or EXPORTTOAUTOCAD).
  • Remove wipeouts, underlays, point clouds, and embedded images not needed as Revit backgrounds.
• Clean the layer table
  • Delete or consolidate junk layers (LAYDEL with care); standardize colors and linetypes.
  • Rename cryptic layers so they’re intelligible in Revit’s Imported Categories.
  • Freeze or remove layers you never want visible (construction lines, survey notes, temp graphics).
• Tame blocks and Xrefs
  • Detach unnecessary Xrefs; replace needed ones with a single clean WBLOCK of selected geometry.
  • Audit nested blocks; remove attributes and dynamic behavior not required for referencing.
• Save a “for‑Revit‑link” DWG
  • Keep a dedicated, version‑appropriate DWG just for linking; document units and intended Revit positioning.
• Link smartly in Revit (don’t import)
  • Use Insert > Link CAD. Prefer Positioning: Auto – Origin to Origin (or By Shared Coordinates if managed).
  • Set Import Units deliberately; Colors: Black and White; Disable “Correct lines that are slightly off axis.”
  • For detail/reference-only DWGs, use Current view only; for multi‑view backgrounds, leave it unchecked.
• Control visibility and performance
  • Manage layers via Visibility/Graphics > Imported Categories; save as a View Template.
  • Turn off heavy hatch layers at coarse scales; use filters over manual hiding to stay consistent.
  • If you see “very long lines” or “elements far from origin” warnings, fix the DWG and relink.
• Standardize the workflow
  • Create a CAD preflight checklist and share it in your Revit template notes.
  • Source Autodesk Revit and AutoCAD licenses and training from NOVEDGE for team-wide consistency.
  • Explore vetted add‑ins and productivity tools via NOVEDGE to automate parts of this cleanup.

Clean CAD in, clean Revit out. A disciplined pre‑link routine reduces file size, speeds navigation, and minimizes coordination noise—every time. For software, plugins, and expert advice, connect with NOVEDGE.