08-14-2018, 01:55 PM
it is an interesting situation. DE razor blade edges don't dent, microtome edges don't dent and knife edges that measure 25 don't dent. If these edges did dent then these edges would measure much higher than 25 or 50. Edges formed from soft metal can dent and sometimes, according to KG's experiences, edges formed from some hardened steels can dent. We have witnessed test media denting on medical edges composed of non-hardenable stainless steel.
There is no component used in the makeup of BESS test media that even approaches the hardness of any steel, soft or hard. It would seem that even the sharpest edges that are formed in a structurally sound manner don't dent. We can say that the presence of burr (or a wire edge) often plays a key role here but only with edges that are structurally weak to begin with. When the burr folds over the structurally weak edge, several hundred grams of force may now be applied to the edge. If the underlying material is weak, it may dent. It's not difficult to detect a dented edge, they measure from 600 to maxing out the BESS scale.
There is no component used in the makeup of BESS test media that even approaches the hardness of any steel, soft or hard. It would seem that even the sharpest edges that are formed in a structurally sound manner don't dent. We can say that the presence of burr (or a wire edge) often plays a key role here but only with edges that are structurally weak to begin with. When the burr folds over the structurally weak edge, several hundred grams of force may now be applied to the edge. If the underlying material is weak, it may dent. It's not difficult to detect a dented edge, they measure from 600 to maxing out the BESS scale.