Introduction: Why File Format Matters More Than You Think
Send the wrong file, and you risk:
•Delayed quotations
•Misinterpretation of dimensions
•Extra engineering back-and-forth
•Even production errors
Send the right file, and everything becomes faster:
•Instant design review
•Accurate quoting
•Smooth transition to machining
This guide explains exactly which file formats we accept, what each one is used for, and how to choose the best format depending on your project stage.
Table of Contents
Our Accepted Drawing File Formats
We support a wide range of industry-standard CAD and drawing formats to ensure compatibility with your workflow.
1. 3D CAD Formats (Recommended for CNC Machining)
These are the most important and preferred file types because they contain full geometric data required for manufacturing.
STEP (.step / .stp) — Preferred Format
•Neutral, widely compatible CAD format
•Preserves precise geometry and structure
•Works across all major CAD software
Why we recommend it:
STEP files are clean, reliable, and minimize data loss. They are ideal for both prototyping and production.
Best for:
•Complex parts
•Multi-surface geometries
•Cross-platform collaboration
IGES (.igs / .iges)
•Older neutral CAD format
•Supports surface geometry
Limitations:
•May cause gaps or broken surfaces
•Requires additional repair work in some cases
Best for:
•Legacy systems
•Surface-based designs
STL (.stl)
•Mesh-based format (triangles)
•Common in 3D printing
Important note:
STL does not contain parametric or dimensional data, which makes it less ideal for CNC machining.
Use only when:
•No original CAD file is available
•Reverse engineering is acceptable
2. Native CAD Files (Also Accepted)
We also accept files directly from major CAD software:
•SolidWorks (.sldprt, .sldasm)
•AutoCAD (.dwg, .dxf)
•Autodesk Inventor (.ipt)
•Fusion 360
•Creo (Pro/E)
•CATIA
Why this helps:
Native files allow our engineers to:
•Access full design history
•Modify features if needed
•Improve manufacturability
3. 2D Drawings (Essential for Manufacturing Details)
While 3D models define shape, 2D drawings define intent.
PDF (.pdf)
•Easy to read and share
•Includes dimensions, tolerances, notes
DWG / DXF
•Editable 2D CAD formats
•Ideal for laser cutting or sheet metal
You should include 2D drawings when:
•Tight tolerances are required
•Surface finishes matter
•Thread specifications are critical
The Best Practice: Combine 3D + 2D
Ideal submission package:
•3D file (STEP preferred)
•2D drawing (PDF with dimensions & notes)
This combination ensures:
•Accurate geometry from 3D
•Clear requirements from 2D
Common Mistakes That Slow Down Your Project
Let’s be direct—these are the issues we see most often:
1. Sending Only Images
JPG/PNG files are not usable for manufacturing. They lack scale, dimensions, and geometry.
2. Missing Critical Dimensions
Even with a 3D model, missing tolerances can lead to:
•Incorrect fits
•Assembly issues
3. Overcomplicated or Unclean Files
•Duplicate features
•Broken surfaces
•Unnecessary details
These increase processing time and cost.
4. Using STL as Final Manufacturing File
STL is approximate by nature. For CNC machining, this can cause:
•Surface inaccuracies
•Poor edge definition
How to Prepare Your Files for CNC Machining
To get the best results, follow these simple engineering practices:
1. Simplify Where Possible
Remove unnecessary:
•Fillets
•Cosmetic features
•Tiny details that don’t affect function
2. Define Tolerances Clearly
Don’t leave it open to interpretation.
Include:
•General tolerances
•Critical dimensions
•Fit requirements (e.g., press fit, clearance fit)
3. Specify Material and Finish
Your file should be accompanied by:
•Material (e.g., Aluminum 6061, Stainless Steel 304)
•Surface finish (anodizing, polishing, powder coating)
4. Indicate Threads and Special Features
Clearly mark:
•Thread type (e.g., M5, UNC)
•Depth
•Special machining requirements
How File Format Affects Your Quote
Different formats directly impact pricing and lead time.
| File Type | Quote Speed | Accuracy | Recommended |
| STEP | Fast | High | Yes |
| IGES | Medium | Medium | Acceptable |
| STL | Slow | Lower | Limited |
| PDF Only | Slow | Low | Not ideal |
Key insight:
Better files = faster quote + fewer revisions + lower cost.
What If You Don’t Have a Proper CAD File?
We can still help if you have:
•Hand sketches
•Reference samples
•Photos with dimensions
Our engineering team can:
•Rebuild your CAD model
•Optimize for manufacturability
•Prepare it for CNC production
Engineering Support Beyond File Formats
Accepting files is just the beginning. What matters is what happens next.
Our team provides:
•Design for Manufacturability (DFM) feedback
•Material recommendations
•Cost optimization suggestions
•Production feasibility analysis
This ensures your design is not just manufacturable—but efficient.
Final Thoughts: Send the Right File, Save Time and Cost
STEP + PDF = fastest and safest path to production
Everything else introduces friction.
In CNC machining, clarity is everything. The clearer your files, the smoother your project.
Ready to Get a Quote?
•Fast response
•Engineering feedback
•Reliable manufacturing solutions
Whether you have a fully developed CAD model or just an idea, we’re ready to support your project from concept to production.
