Hello to all the forum, this is my 1st post in here.

I have a problem as the title states the weird surface pattern. It is every 4-5mm as the pitch in ballscrew. Please check attachment.

First pass was with 1mm stepdown and 0.7mm offset. Second pass was with constant Z strategy with 0.1mm stepdown. Same pattern appears in radial strategy with 0.06mm stepover. Off course second pass was a ballnose endmill.

I played we tolerance in solidcam but made no difference.