products are usually a single layer of diamonds highly concentrated and
held on by a tough, durable nickel alloy. This high concentration,
usually about 140-150, enables plated products to remain their original
shape and dimension throughout their working life. Unlike the metal or
resin bond impregnated products where the diamond particles are buried in
the bond, the plated product allows the diamond particles to protrude from
the surface and gives a freer, faster cutting action with minimum heat
Diamond Plated products can be used successfully on the following materials:
Diamond Plated products are used in the following industries:
CIRCULAR SAW BLADES
Whenever a circular saw becomes glazed or
loaded with soft materials, such as uncured resins or fused dust, it can
be easily cleaned. The optimum cleaning method is to soak over night in
Methyl Ethyl Ketone and use a wire brush. When excessive loading and
burning has occurred, a soft silicon carbide stick followed by a rubber or
cretex abrasive stick, held against the rotating blades cutting edge will
usually abrade away the fused materials. When cutting or grinding
material that is generally Gummy or does not cut freely it is suggested
using a slotted blade and if possible using water to help wash away the
excess dust to keep from loading and burning.
All National Diamond mounted saws are of
one-piece construction. We do not braze, solder, or weld our shanks to
the saw to prevent separation when in operation. Mounted saws are
manufactured continuous or slotted to aid in cooler operation. These
special design tools are normally used in hand trimming, grooving,
slotting or I.D. grinding operations. They are most efficiently used with
air routers 1/2 to 1 horsepower rotating at approximately 15,000 RPM to
17,000 RPM. Both sides of the cutting edge are plated with 1/8 return of
diamonds, which allows for relief to prevent binding. In many cases
mounted saws can be recoated at a 20% savings, providing the old blank can
When using a diamond-coated router, the cutting action does not depend on sharp edges of the tool, but on the abrasive action of the diamond grit. Fiberglass plastics quickly dull the sharp edges of any router. The proper method of removing stock with a diamond-coated router is where the maximum depth of cut is approximately one-third of its diameter. This will allow the tool to get rid of the dust it creates as fast as it is generated. To obtain maximum life out of the router you should never use it as a saw.
Air hand tools as well as electric tools are
suitable for all routers. On routers from 1/4 to 2, 20,000 RPM and 3/4
to 1 1/2 horsepower should be used to maintain proper speed under load and
permit the diamond grit to scratch out the dust without undue pressure.
This will reduce the heat generated by the abrasive cutting action. The
high speed will also give you maximum life out of the router bit.
National Diamond hole saws can be
manufactured from a one-piece construction for precision core drilling.
We can also manufacture these from standard hole saws such as Starrett,
Nickleson, Black & Decker, Miller Falls, Milwaukee, and Do All. The teeth
are removed and diamond is plated on the cutting surface. On most
materials the recommended speeds are as follows; 1/2 to 1 1/4 speed of
2100 RPM, 1 1/4 to 2 speeds 1500 to 1700 RPM, and 2 to 3 speeds of
1100 RPM should be used. On 4 1/2 drill speeds 600 RPM is used, and on
the larger than 4 1/2 speeds range from 250 to 400 RPM. The slower
speeds are being used as the materials hardness increases. As in most
other plated products, hole saws can be recoated at a 20% savings,
provided the old blank can be reused.
Recoating or Reconditioning
After extended periods of hard usage and the
cleaning process has to be done more frequently or excess pressure is
needed to pass the tool through the material, it may become evident that
the tool is simply worn out. When this occurs, most plated tools can be
returned to the factory for complete reconditioning and recoating. This
recoating process is done by removing all the old diamond and plating left
on the blade and if need be re-worked before diamond is again applied to
restore it to its new condition. This recoating service is economically
feasible in the fact that it is 20% less than the cost of a new blade.
For maximum value it is often not feasible to send only one blade in at a time. Example: sending 1 #SB2U - 2 Saw Blade to be replated at a 20% discount comes out to $19.20. New cost would be $24.00, giving you a savings of $4.80. Weighing out the savings along with the cost of shipping the part to NDL to be replated might not be cost effective.
* 20% DISCOUNT FOR STRIPPING & REPLATING *
Note: With stripping and replating, the tool(s)
sent in must be in reusable condition. Ask for more details.
Diamond Grit Information
RPM and SFPM Chart found in General Information