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Jeffs read on Plated bond CBN Grinding Wheels

Our version of the facts on application and use of Plated bond Grinding wheels

 Metalcore super abrasive wheels. (We like Aluminum)

Metal Plated bond Superabrasive wheels are designed to be run concentric in a thermally controlled condition as the cannot be shaped into true like with traditional truing methods and as they surface doesn’t breakdown like a vitrified wheel — friable.

Steel VS Aluminum 
Nickel to Steel has always been a chemically ideal situation, thus it was
a natural first stop for plated bond wheels.
Only recently have the manufacturing processes improved
making it possible to develop a 100 percent strength bond between aluminum and nickel.
Now that this is a fully mature  process aluminum brings certain Prefered physical attributes
In an environment where accuracy and Heat are vital considerations Aluminum wins the day
Lighter   
store less kinetic energy 
better heat dissipation
same or better tensile strength that steel wheels
Better balance 
Better accuracy 
If the grinder has the torque and smoothness/accuracy of runout the result is longer life and a more accurate grind /finish
 Variable Speed DC Grinders
Traditional AC induction motor  Grinders were not designed with Plated wheels in mind. Their shaft accuracy speed is suited to for a Vitrified wheel which can be trued in place with diamond or another wheel truer and must be constantly maintained for shape.
Plated Bond wheels are good for shape retention and when mounted on a machine designed  to present the best speed, torque and run out characteristics. In this situation smooth accurate material removal can be achieved in most all materials, Tool Steels, Carbide, Plastics, carbon fiber non-ferrous metals not possible with vitrified mineral wheels at high speeds.
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Terry @ Black Forest Woods–   Aluminum Core CBN Wheel Notes

Radius edge Aluminium CBN wheels offer advantages compared to steel CBN Wheels

Aluminium Core Corner Round (CR) CBN Wheels

Recent advances in electroplating technology have made possible the adhesion of CBN particles to aluminium using nickel substrate.

Aluminium Core CR CBN wheels offer advantages compared to Steel Core CBN Wheels.

Aluminum has the same or better tensile strength than steel  Aluminium is easier to machine therefore can be machined to finer tolerances faster  than steel, resulting in a truer running wheel with less tool bounce than on a steel wheel.

Aluminum transfers heat about 7 times faster than steel.  When combined with CBN, which conducts heat 20 times faster than copper to the aluminum, you can sharpen at a cooler temperature with less risk of tool damage compared to a steel wheel.

An aluminum wheel is about 60% lighter in weight than a steel wheel.  This weight reduction puts less stress on the grinder bearings and as there is less kinetic energy the free-wheeling time for the grinder to stop is reduced.  The reduced weight of aluminum wheels has the added advantage of lower shipping costs thereby offering more value less need for balancing.

The corner round allows sharpening of complex profiles by laying the tool flat on the grinder tool rest and simply guiding the tool edge along the rounded corner.

The corner round is safer than a sharp cornered wheel in case of accidental body contact.

Metal wheels are much safer than vitrified “stone” wheels as they do not come apart or potentially disintegrate.

Unlike vitrified wheels, CBN wheels do not need to be dressed and the face remains flat and true.

Metal wheels do not wear down and therefore do not reduce in diameter with use like vitrified wheels.  Therefore sharpening jig set-ups remain the same with constant diameter metal wheels resulting faster and more accurate sharpening and longer tool life.

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Harry at Diamond industrial: