IGES to STEP
Convert an IGES file (.igs, .iges) to STEP, free and with no account. The converter sews the IGES surfaces into a solid, writes it as STEP AP214 and checks the result against what it read before you can download it. It all runs in your browser, so the file never leaves your computer.
Your file never leaves your computer: the conversion runs in your browser.
IGES describes a part as a set of surfaces with nothing tying them together. Every program that opens one has to work out which edges meet, and where the gaps between surfaces are bigger than it expects, the result is a hole, a sliver or a part that will not close. STEP stores the solid itself, so the program opening it has nothing to work out.
The converter sews the faces together at 0.01 mm first and, only if that leaves edges open, tries 0.05 mm and then 0.1 mm, keeping the first that closes. It is the same sewing Lasertally's quoting software uses on IGES parts. A part that closes is written to STEP as a solid. If the surfaces still do not close, nothing is forced shut: the page tells you the file holds open surfaces before you convert it.
The STEP is read back and compared with the sewn part it was written from: volume and surface area to one part in a million, size to 0.001 mm, the same number of solids. Assemblies inside the IGES are flattened into their solids, and colours and layers are dropped.
Credits and licences for the projects the converter is built on are on the converter page.
Because IGES stores faces, not solids, and joining them is left to the program opening the file. If its tolerance is tighter than the gaps in the file, the faces stay apart. A STEP made from the sewn solid opens as a solid.
No. Sewing closes the small gaps that IGES files normally carry, up to 0.1 mm. It does not invent missing faces or patch real holes, and an open part stays open.
STEP AP214, in millimetres, the version most CAD and CAM systems ask for.
Lasertally is Windows software for fabrication shops. It opens STEP, IGES, DXF and NC1 files, measures the pierces, cut length and bends off the geometry, and prices the part on your own rate card.