Sending wrong file types to a sheet metal shop is one of the biggest causes of delays in sheet metal fabrication before the first cut is made. What file types are accepted by a sheet metal shop and what do they do?
DXF and DWG
DXF files are used for cutting and profiling work in 2D format. DXF files are usually accepted by all laser and plasma cutting machines. DWG files are in the same 2D format but are AutoCAD files and must be checked with the supplier as to whether they can open DWG files or not.
STEP Files
STEP files are preferred for more complex 3D Sheet Metal Fabrication projects. These files allow us to view full geometry of parts and they are software-neutral which means they open correctly in all CAD programs.
IGES Files
IGES (The Initial Graphics Exchange Standard) is an older 3D exchange format, defined in the recognised file format registry for interoperability of CAD data. As with many older standards, there are more modern and clean methods of achieving the same goal, and STEP files are generally preferred for Sheet Metal Fabrication jobs with complex bends or formed features.
PDF Drawings
It’s also very important to include a PDF Drawing (with dimensions etc.) for the fabricator’s reference prior to cutting. For Sheet Metal Fabrication, visit DKM Sheet Metal.
Native CAD Files
Flattened or Unfolded Files
Before a part is cut in the shop it is first unfolded into a flat pattern (referred to as a sheet pattern). Most fabrication shops can create the pattern for you and send it back to you as a DXF file. However, some shops require you to create the pattern and send it to them as a DXF file. For parts with very tight bend radii it is best to agree upon a bend allowance before submitting the files for fabrication.
Make sure you get the files right before you send them and you will save a lot of time on both sides.