Boring machine knocking experience and skills?
No, then re-adjust the knife, until the size of the appropriate so far.
Tighten, first try boring a knife, boring into 1 ~ 2mm deep (caliper can measure), stop, measure, look at the size of boring is appropriate.
Before the knife, measure the distance from the tool nose to the boring bar with a caliper, and then look at the number of changes after adjusting the size of the tool bar to the appropriate size.
