Improving Surface Finish on CNC Machined Parts

When your CNC parts come out with a rough surface finish, start by examining the cutting tool. A dull or chipped tool will leave marks; replacing it often solves the issue. Also verify that the tool is properly secured and that the runout is minimal.

Next, review your feeds and speeds. If the feed rate is too high or the spindle speed too low, the tool may rub instead of cut cleanly. Try reducing the feed rate by 10-20% while keeping the speed constant. Similarly, adjust the depth of cut and stepover for finishing passes to lighter values.

Coolant can also affect finish. Ensure sufficient coolant reaches the cutting zone to lubricate and flush chips. Using a higher concentration of cutting fluid or a different type may help. Finally, check for vibrations or chatter. Machine rigidity, tool stickout, and workholding all contribute. Shortening tool overhang and using a secure vise or fixture can dampen vibrations.

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