Originally Posted by
delco
I am looking for clues in what is causing this strange harmonic pattern in my machine , it seems to have visual ridges at set intervals , cannot feel then at all.
Flat surfacing was done across the X axis with a 3 flute 12mm endmill , the curved section is machined with 6mm 4 flute bullnose rad 0.5mm with a 0.4mm stepover in the same direction .
I can feel the 0.4mm stepover , wich is fine , just the visual banding is wierd . The band is 2.5mm wide so a cycle is 5mm , same as my ballscrew pitch