What is the difference from a grinding wheel?

Thickness and which way it is used. A cutting disc is thin and works on its edge; a grinding wheel is thick and works on its face. Substituting one for the other is both dangerous and ineffective.

Is a separate disc really needed for stainless?

Yes. Iron residue from a standard disc starts corrosion on a stainless surface; stainless discs are made free of those three elements.

Which sizes suit a micro tool?

Micro tool chucks take thin discs in the 20-50 mm range, usually sold in packs of 10 or 50; size and pack quantity are in the spec table.

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Cutting Discs

A cutting disc is thin and hard, and unlike a grinding wheel it works on its edge rather than its face. Diameter, thickness and bore decide which machine it fits; the bond and the grain decide what it cuts.

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Why a thinner disc cuts better

The thinner the disc, the less material it removes: the cut is faster, the heat lower and the edge less burnt. In exchange a thin disc has no strength against side load — bend it in the cut and it breaks.

That is why you never grind with a cutting disc. Pressing on the face puts it under side load, and that is the commonest reason one shatters.

The disc follows the material

Aluminium oxide for steel; for stainless a formulation free of iron, sulphur and chlorine, because iron residue left on a stainless surface starts corrosion later.

For ceramic, stone and glass, silicon carbide or a diamond rim. The same distinction holds at micro tool sizes.

Frequently Asked Questions

What is the difference from a grinding wheel?
Thickness and which way it is used. A cutting disc is thin and works on its edge; a grinding wheel is thick and works on its face. Substituting one for the other is both dangerous and ineffective.
Is a separate disc really needed for stainless?
Yes. Iron residue from a standard disc starts corrosion on a stainless surface; stainless discs are made free of those three elements.
Which sizes suit a micro tool?
Micro tool chucks take thin discs in the 20-50 mm range, usually sold in packs of 10 or 50; size and pack quantity are in the spec table.