How to convert IGES to STEP without losing the solid

خطوة بخطوة

1. 1Open the .igs file in FreeCAD, SolidWorks, Inventor, Fusion 360 or Rhino — anything with a solid modelling kernel.
2. 2Run the import diagnostic and heal the geometry: sew or knit the surfaces, then close any remaining gaps within the model tolerance.
3. 3Confirm the result is a solid, not a surface body (check the volume or mass properties — a surface body reports none).
4. 4Export STEP, choosing AP214 for assemblies and colours or AP203 for single parts with the widest compatibility.
5. 5Re-open the STEP in a different package to verify before issuing it to the machine shop.

أمور يجب الحذر منها

• If knitting fails, the original IGES was exported with too loose a tolerance. Ask for a fresh export at a tighter tolerance, or for STEP directly.
• IGES trimmed surfaces often arrive duplicated; delete the duplicates before sewing or the knit will never close.
• Colours, layer names and assembly structure rarely survive IGES, so expect to rebuild them.
• Analytic surfaces can become NURBS approximations, which slightly changes downstream fillets.

أسئلة يطرحها الرسامون الفنيون