How to remove dimensions, notes and title blocks from a DXF

To remove dimensions, notes and the title block from a DXF, delete in bulk first and by hand second. In your CAD program, hide or isolate layers so only the part is left, select and delete by entity type (dimensions, text, hatching, blocks), pick out centre lines by linetype or colour, and window-select the border, title block and notes. Then delete the views you don’t need, and finish by joining, de-duplicating and checking the scale. If the DXF was made by converting a PDF, the dimensions usually arrive as loose lines, filled triangles and text rather than dimension objects, so selecting by type misses most of them and the work is mostly by hand. If you still have the PDF, extracting the part from it in the first place avoids the clean-up.

What kind of DXF do you have?

How much of the clean-up can be done in bulk depends on where the file came from:

• Exported from the customer’s CAD. Dimensions are dimension objects, text is text, and there are often layers with names like DIM, TEXT, CENTRE or BORDER, and a title block that is a single block. This is the easy case.
• Converted from a PDF. The meaning was lost when the drawing became a PDF: a dimension is now a few lines, two filled triangles and some text, often all on one layer or sorted by colour. Text may have come across as outlined letter shapes.
• Traced from a scan or image. Everything is an outline of something, including each letter. Cleaning this up is rarely quicker than rebuilding the part from its dimensions.

To tell which you have, click a dimension. If it highlights as one object, the bulk methods below will do most of the work. If you get a single line or arrowhead, you’re in the second or third case.

How do you strip a DXF back to the part in CAD?

The commands have different names in different programs, but the steps are the same:

1. Work on a copy. Keep the original, so you can go back and check something you deleted.
2. Use the layers. Hide or isolate layers until only the part is showing, then delete everything on the hidden ones. Don’t stop at hiding: hidden geometry is still in the file, and CAM may read it.
3. Select by type. A quick-select or select-similar command can pick every dimension, leader, text and multiline text object, hatch, block reference and point at once. In a converted file, add solid fills: that’s what arrowheads usually become.
4. Select by appearance. Centre lines and hidden lines often have their own linetype, colour or line weight, so select by that. If their dashes came across as separate short lines, select by colour, or window-select carefully round each hole.
5. Window-select the sheet furniture. The border, zone marks, title block, revision table and general notes sit away from the part, so one or two windows usually take them all.
6. Keep one view. Delete every view except the one showing the part’s flat shape, then that view’s hidden lines. Check other views and notes first for features that appear only there.
7. Purge. Remove the now-empty layers and unused blocks and styles, so nothing unexpected travels with the file.

What usually gets left behind?

Zoom in round the part before you call it done. The usual survivors are:

• Arrowheads, as tiny filled triangles or three short lines, sitting right on the part’s edge.
• Extension lines, which stop just short of the edge and look like part of it.
• Centre-line dashes inside holes, which CAM may try to cut.
• Letters as shapes. An O, A or 8 that came across as outlines is a closed loop, and CAM can read a closed loop inside the part as a hole.
• Specks and stray points, often far off the sheet. Zoom to the drawing’s extents: if the part doesn’t fill the screen, something is still out there.

What has to happen after the clean-up?

Deleting the extras leaves the part, but not yet a part CAM can cut. The profile and holes from a converted drawing often arrive in pieces, drawn twice, or as chains of short lines, and at the sheet’s scale rather than true size. Join and close each contour, delete duplicates, replace short-line chains with arcs, put the profile and holes on their own layers, and check two dimensions against the drawing. The target is set out in what makes a DXF ready for laser cutting, and the scale check in what a wrong scale tells you.

When is it quicker to go back to the PDF?

The clean-up above is one way of picking the part out of a drawing. The other is to pick it out before anything becomes a DXF: redraw it from the dimensions, or use a tool that extracts the part rather than converting the page. Why a page converter keeps everything, and how the two approaches differ, is covered in why PDF to DXF converters bring across the whole drawing, so it isn’t repeated here.

Cleaning up the DXF you have is the better route when:

• The DXF came from the customer’s CAD, with dimension objects and layers to select by.
• The sheet holds little more than the part.
• You need the whole sheet in CAD anyway, or you only have the DXF.

Going back to the PDF is the better route when:

• The DXF was converted from a PDF, and the sheet is busy.
• The sheet has several parts or views to pick between.
• Text came across as shapes, or curves as chains of short lines.
• Drawings like it come in every week, so the same clean-up keeps coming back.

Can Nest Ready clean up a DXF?

No. Nest Ready is our product, and it reads drawings, not DXFs: you upload the PDF, JPG or PNG, and it extracts the part from that. So if you have the PDF that your cluttered DXF was made from, that’s the file to use. Nest Ready reads the whole sheet, works out which view shows the part flat, and builds the profile and holes from the dimensions written on the drawing. Dimensions, notes, borders and title blocks are left behind. The bracket example lists what was kept and what was left out of a real run.

The DXF is R12, with LINE, ARC and CIRCLE only: the outer profile on layer OUTER, holes on INNER, at true size in millimetres. Anything uncertain is flagged for review. A side-by-side of the same drawing through a page converter and through Nest Ready is on Nest Ready vs a PDF to DXF converter.

The limits: it can’t open, repair or tidy a DXF you already have. You get the part, never the whole sheet, with no text, marking or bend lines. Review is advisory, so flagged parts you haven’t decided on still download. Check every DXF against the drawing before cutting.