Buyer resource
STEP vs IGES for CNC Manufacturing
Both formats can exchange geometry, but STEP is generally the more reliable starting point for modern solid-model CNC reviews.
Technical resource
Why STEP is usually preferred
STEP commonly preserves solid bodies and assembly structure more consistently. It is easier to interrogate for volume, faces and manufacturable features than a collection of disconnected surfaces.
Where IGES can still be useful
IGES may be needed for older systems or surface-focused data. Imported surfaces should be checked for gaps, reversed faces and missing trims before quoting or programming.
The 2D drawing remains essential
A model rarely defines every tolerance, datum, thread, surface finish, coating, inspection instruction or revision note. Pair the 3D file with a controlled PDF drawing.
Before sending files
- Confirm units and revision
- Remove unrelated proprietary geometry
- Check that the exported body opens as expected
- Name the controlling model and drawing clearly
- Use the secure RFQ upload instead of a public media link
Review your actual part
Send the model, drawing and requirements for a manufacturing assessment.