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When surface finish isn't defined to CNC manufacturers - bad habit?

Question asked by Valery Volkov on Jun 16, 2020
Latest reply on Jun 16, 2020 by Chris Saller

I see a lot of engineers not defined surface finish to CNC manufacturers and the part typically comes out smooth and fine. Is surface finish only to be defined when necessary to achieve certain smoothness due to design requirements or is it good practice to ALWAYS define it?