Ein beitrag zur frage welche kra¨fte und faktoren du¨nnstschneiden bewirken

Abstract

The mechanical processes occurring around a cutting edge when a thin slice is formed are related to those effective when metal or plastic is lathed. Critically assigning to thin slicing of resins the force vectors proved or assumed to be true for shapping by chipping, the attempt is made to clarify qualitatively and quantitatively the complex interplay after having measured the effective weight force and the order of magnitude of the radius of cutting edges of glass and diamond knives. Practically, only five force vectors in a polygon determine shearing and shortening of chips or thin slices, shortening obeying a broken rational function. By computing the relative values of shortening, all other force vectors can be computed. The results obtained for the normal force on the edge surface and the tangential force in this surface shed light on the effect of systematical variation of setting angle, bevel angle, and chip angle for thin slicing; thus possibilities of improvement in conventional “ultra” microtomy and in unadulterated cryotomy are shown in concluding recommendations.