Plasma DXF base plate files for Australian SHS columns
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What to check before you run metric base plate DXFs on a plasma table: SHS sizes, bolt holes, edge distance, layers, and a parts checklist that points to the A$9 DXF pack.
Base plates are the DXF most fab shops cut every week – and the file most often wrong when it came from an imperial pack. This page is the buyer-intent checklist before you hit cycle start. Broader nesting context sits in the cut list vs DXF guide.
The short answer
- Use millimetres at 1:1. Confirm SHS outside sizes match Australian sections (50, 65, 75, 89, 100, 125, 150 and so on).
- Hole diameters are usually bolt + 2 mm for M12 / M16 / M20 shop plates – confirm against the engineer's drawing.
- Edge distance matters. AS 4100 sets minimums for sheared or hand flame-cut edges; do not crowd holes to the plate edge.
- Layers help: CUT, HOLES, MARK (layout only), NOTES. No duplicate lines.
- Set kerf and lead-ins in your CAM. The DXF is geometry, not a finished nest.
Pre-cut checklist for base plate DXFs
- Units = mm, scale 1:1 in the CAM import
- SHS outline matches the section you are welding
- Hole size and centres match the bolt schedule
- Plate overall size matches the drawing (not just the SHS)
- Closed outlines, no stacked lines
- Thickness chosen from the drawing / engineer – not guessed from the file name
- Kerf offset set for your plasma consumables
Worked example – SHS 100 column base
DXF named BASE-SHS100-M16.dxf: 300×300 plate, SHS 100 outline on MARK layer, 4× Ø18 holes (M16+2) at centres taken from a typical shop layout. Operator confirms drawing calls 16 mm plate and M16 8.8 bolts with 1.75d edge distance before cutting a nest of six.
Important: typical shop DXFs are starting geometry, not an engineered design. Plate thickness, weld size, bolt grade and anchors come from your engineer or job drawing.
Handy shop gear (affiliate): LED torch for layout marks and digital multimeter for checking earth leads on the plasma table.
Quick answers
Are free online base plate DXFs safe to cut?
Only after you check units, scale, SHS size, hole centres and that the file matches Australian sections. Many free packs are imperial.
Does the DXF include kerf?
Usually no. Set kerf and lead-ins in SheetCam, FastCAM or your plasma CAM.
Can I use the same plate for every SHS 100 job?
Only if the bolt schedule, plate size and thickness match the drawing. When in doubt, cut to the engineer's detail.
What else comes in a good metric pack?
Gussets, welding squares and pipe saddle templates save redrawing the weekly repeat parts.
Sources
- Australian Steel Institute
- Standards Australia – AS 4100 Steel structures
- Andwat – Cut lists vs DXF plasma files
Related guides
- Steel cut lists vs DXF plasma files
- Steel cut list calculator
- Steel weight per metre formulas
- Fabrication ITP guide
General information only, summarised from the official sources above as at the review date. It isn't legal, WHS or engineering advice. Rules change and your situation may differ, so check the source or ask a professional.