Normark EKA 12C27 : optimal edge geometry for slicing hardwoods (norton economy fine edge) скачать в хорошем качестве

Normark EKA 12C27 : optimal edge geometry for slicing hardwoods (norton economy fine edge)

This is an example of a set of experiments I typically use to determine the optimal edge configuration for a knife. In this case I want the hardest task to be cutting hard woods with high force and moderate twisting. The first configuration is : -knife full convex ground, edge is ~7 dps, 15 dps micro-bevel This however leaves the edge too weak and it twists/deforms to a depth of about 0.005" at maximum. The second configuration is : -apply a 10 dps secondary edge bevel, ~0.003" thick -then a 15 dps micro-bevel This is much better and after a couple of hundred passes there is only one small point of visible deformation. The third configuration is : -apply a 12 dps secondary edge bevel, ~0.003" thick -then a 15 dps micro-bevel Now it does 1000 slices into the hardwoods with no visible damage. The edge and apex are both strong enough to resist deformation and thus the blunting is by slow wear. After 1000 slices the knife can no longer do a true push cut but does 45 push cuts and easily makes looping slices.