Surface finish refers to the smoothness or roughness of a machined surface. Different finishes require varying machining techniques and times. Here's how surface finish impacts cost:

Understanding Finish Needs

Similar to tolerances, defining the required surface finish based on functional needs is crucial. Don't get caught up in purely aesthetic considerations. Here's how to approach it:

l Functional vs. Aesthetic: A rougher surface finish, like a "machined finish" achieved directly from the cutting tool, is faster and cheaper to achieve than a smoother finish, like a polished finish. Ask yourself if a smoother surface is truly necessary for part performance or if a machined finish would suffice.

Post-Processing Options

l Secondary Finishes: Consider achieving a desired finish through post-machining processes like sanding, polishing, or plating. This can be more cost-effective than extensive machining for smoother finishes. CNC machining can create a good starting point for the surface, and then secondary processes can achieve the final desired smoothness.

For more information please click: A Guide to Cost-Effective Tolerance and Surface Finish Strategies in CNC Machining.