Moulding Knife Grinding & Moulding Knife Steel Video
We grind all our moulding knives on a Weinig R-960 profile grinder, there are several custom options on our
particular machine that allows us to manufacturer with superior results, these options make our moulding profile
grinder the “Technician's Choice”. We grind 60 Degree Corrugated (1/16" between corrugations) 1/4" & 5/16" thick
high speed steed, and 3/8" thick European style carbide two-piece (backer & solid carbide plate).
Which quality of knife steel should you use?
Mirror Reflections uses the highest quality knife steels and carbide available. We have four different grades
to choose from, V2+RW, Black Nitride, Endurance, and Carbide. Choices of quality to use and grades are
summarized as follows.
V2+RWRockwell Hardness about 58-62, Good Quality. Made for short runs, (1' -
1000') of high quality millwork. This steel is flash coated with a special hard chrome coating (.001") thick
to help provide very long wear on the cutting edge. It will outlast any standard M-2 steel that's not coated.
This steel is easy to grind with standard grinding wheels and borazon finish wheels. This steel is easy to
joint on high speed machines.
BLACK NITRIDERockwell Hardness about 70-72 (Surface Only), Premium Quality. Black
Nitride (carbon nitride) steel offers longer run times than standard M2 or M3 high speed steel (1' - 2000').
Adding pure carbon to the top surface of the knife steel hardens the cutting edge about .010" to obtain about
a 72 Rockwell. Steel is black oxide to reduce pitch build up and rust, this also gives the steel a uniform
color due to the case hardening. Because the steel is case hardened and higher on the Rockwell scale this
steel is more brittle than other non-case hardened steels. Excellent for stubborn hardwoods and softwoods, but
not recommended for knotty woods or very large cuts over 1" depth of cut.
ENDURANCERockwell Hardness about 70-72 (Surface Only), Superior Quality.
Endurance super run is the premium of all high speed knife steels. They start with V2 base, then apply P.V.D.
(Physical Vapor Deposits) in an Ion sputtering magnetron chamber. These deposits consist of a five layer film
of Aluminum, Chromium, Molybdenum, Nitride, and Titanium. This forms an extremely hard and heat resistant
cutting edge twice as hard as C2 grade carbide. Because the coating is so thin, normal vitrified rough wheels
and CBN finish wheels can be used on this product. Special care must be taken not to hone the face of the tool
with anything but a block of wood. Tool life is increased up to 600 percent over normal high speed steel.
Small amounts of MDF (500' or Less) can be run with this product.
CARBIDERockwell Hardness about 90-94, Requires diamond grinding wheels to
sharpen. Excellent run life for products such as MDF, composites, exotic species such as Anigre, Teak,
Ironwood, and Monkey Pod to name a few. We offer this in Euro Style (Backer Plate & Solid Carbide). Cost is
expensive (see pricelist) product comes in pre cut lengths.
Each company has its own quality standards for their mouldings; some will get more lineal footage and some less
lineal footage than the estimates given. Many factors come into play such as quality of lumber, whether it's
pre-surfaced or rough, abrasive planed rather than surface planed, etc. If you hit a staple it will chip the
steel or carbide, regardless of steel grade.