What causes a crescent or bow-shaped cut?
There are several possible sources for this problem.
First, check the bed knife to make sure it is straight across the entire surface. This is done by measuring from the edge of the knife to the back of the knife in a half dozen evenly spaced intervals along the length of the blade. MAXSON recommends no more than 0.010″ (0.25 mm) variation along the blade.
The position of the bed knife may also be causing a bow-shaped cut. Examine the knife to determine if it is seated properly into the bed knife base, free of foreign debris underneath.
Finally, check the condition of the doctor board before the knife. If it appears to sag in the middle, then it is not supporting the sheet properly. Correct as required.
