CNC Materials & Surface Finishes: A Practical Selection Guide
Compare CNC metals, engineering plastics and surface finishes through worked selection cases, dimensional calculations and a reusable decision worksheet.
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About this guide
This 36-page guide helps engineers and buyers connect application requirements to a material shortlist, surface condition and validation plan. Three worked cases cover an instrument housing, a washdown block and a precision polymer locator.
What’s inside
| Topic | What you will work through | Pages |
|---|---|---|
| Define the selection criteria | Read property data in context and screen metal and polymer options. | 3–12 |
| Calculate the trade-offs | Compare mass, stiffness and thermal movement; review a completed material selection. | 13–16 |
| Specify the finished condition | Review finish zones, anodizing allowances, conversion coatings, stainless surface treatments and nickel plating. | 17–23 |
| Validate the choice | Work through corrosion and polymer cases, test planning, troubleshooting and purchasing requirements. | 24–31 |
| Reuse the worksheet | Record the material and finish decision brief; consult the source register. | 32–35 |
Fillable worksheet
Page 32 includes an 11-field worksheet for recording the part, application, selected material grade and condition, finish, and any tests or records still needed.
Download the PDF and open it in a reader that supports PDF forms. Save a copy after entering your information and reopen it to check that the entries were retained.
How to use it
Use the worked examples to prepare questions for the responsible designer and supplier. Keep grade, product form, temper, finish zones and final acceptance requirements with the released drawing.
Related engineering resources
Continue with CNC Part Inspection & Quality Acceptance and the CNC Part Design & Manufacturability white paper.
Published by VETCNC. Version 1.0 · September 2026 · English.