Combining 3D printing and CNC machining can provide a reliable and repeatable method for achieving tight tolerances for critical specifications , for example for aerospace or medical components . For example , if a completely flat , surface to surface connection is required .
Services are available for both 3- and 5-axis machining of 3D printed parts . Part complexity and the finish requirements generally tend to dictate which process is required .
One important note for this approach is to build in excess material on the 3D printed part to accommodate machining down to the exact tolerances , particularly if fine features or thin walls are involved . The downside to this is additional waste material , but it is not that much different to sanding .
ELECTROPLATING / METAL PLATING
This is a particularly useful finish for 3D printed polymer parts . It is a relatively complex process and requires specialist equipment and skills . However , there are a number of service providers now that have dedicated facilities to provide this solution . Most polymer materials can now
Combining 3D printing and CNC machining can provide a reliable and repeatable method for achieving tight tolerances for critical specifications
be electroplated , but you should discuss material selection directly with the solution provider .
Electroplating offers a realistic metal finish that can provide the benefits of both plastic and metal including added strength and reduced weight . In addition , electroplating protects polymer parts against corrosion , improves electrical conductivity and reduces friction . The aesthetic finish is generally excellent . An alternative solution to full electroplating to achieve the look of metal is metallic spraying . Again , this can be achieved by specialist companies , with an example below .
ROUND UP
To round up this
series of articles on post processing , it seemed fitting to provide insight into alternative solutions that are available for a more customised approach to 3D printed parts — even though that ’ s not our thing . The over-arching aim of the series has been to provide 3D printing users , whether in-house or contracted out , with a comprehensive resource when it comes to post processing , the pro ’ s and cons and the options available .
As ever , the choice will come down to the application and the dominant requirements to fulfil it in the most time- and costeffective way .
If you want to discuss any post processing requirements for medium and higher volumes of parts , reach out to our technical customer service team today .
For further information , please visit www . 3dprint-uk . co . uk
36 PECM Issue 59