() ( Felling). The notch cut in a tree to govern the direction in which the tree is to fall and to prevent splitting. Syn. Notch. () ( Mens.). The harvesting of a quantity of timber less than the prescribed cut. ( BCFT modif.).
1. In relief style printing plates or steel die plates it refers to the area not required to print or cut. 2. In printing cylinders it refers to the allowance in the diameter made to accommodate the double sided tape and the printing plate.
The undercut is a haircut much like a bowl cut except the ridge of the bowl is not where the cutting ends. The ridge of the bowl is lifted so the hair is clipper cut further up the side of the head an additional one to two inches. This allows the head to be shaken and the bowl look will always return to its regular shape.
Engravings on which side-wall areas have been etched under the printing surface. The difference between the radius of the cylinder bearers and the cylinder body, to allow for plate and mounting tape thickness.
A portion of the part geometry that would prevent the part from being ejected from a straight-pull mold without a portion of the mold passing through (and destroying) the part. The simplest example of an undercut feature on a part would be a through-hole aligned perpendicular to the direction of part ejection. More Info
An overdeveloped, unstructured hollow incapable of holding ink. If undercuts develop on the plate, image exposure or screen exposure time or both must be increased. If this does not help, a lighter image positive must be made.
Used both as a verb and a noun, this refers to removal of material on the underside of a wing to provide more, or less, drag and lift. Most commonly this is seen on the underside of the leading edge of a wing, in order to improve lift.