Why is the aluminium scrap granular when turning the end face? Would you please ask the lathe master to help you solve it?

The aluminum material is soft, if the cutter is not sharp enough, the rake angle is too small or the cutting speed is too low, and the amount of feed-back cutter is too small, the chips may be unsmooth and granular. In this case, a sharper knife, deeper cutting depth or higher cutting speed can all be improved. There is also a small feed.