Troubleshooting Swirl Marks from CNC Bit
From contributor V:
1. RPM is too slow for the feed rate.
2. The tips of the tool are different heights.
3. One tip of the tool is damaged.
From contributor G:
Try the Onsrude 66-300 series. They are made for bottom surfacing applications. They are up-spirals with the tips rounded off. I've had good experience with them.
From contributor B:
Check to see that your spindle is square. If the head assembly is not square, the tool will cut with one edge/tip and leave swirl marks. To check squareness/spindle sweep, mount a dial indicator to the spindle so it will swing about a 24" diameter circle, bring the indicator down to the table and slowly spin the indicator 360 degrees; you should not see much more than .002 total. More than that and you probably need the head squared up.
From contributor E:
I am assuming the swirl marks are on the bottom of the cut. It could be from a variety of things. Bottom clearance or lack of on the tool. Too fast rpm's. Chips are being recut. And like the other gentlemen mentioned, spindle can be off.
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