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Diamond Wheel Material Selector

Pick your workpiece material and grinding operation to get a recommended abrasive, bond, grit, concentration, shape and coolant — with a boundary warning for ferrous materials.

Technical Disclaimer: Recommendations are preliminary selection guidance based on general grinding practice, not a guarantee of performance. Bond, grit, concentration and shape must be confirmed with your wheel supplier and validated in a trial grind on the actual machine, fixture and coolant. Never exceed the maximum operating speed marked on the wheel, and never use diamond on steel or cast iron — use CBN for ferrous workpieces.

Workpiece material

Grinding operation

Recommended diamond / CBN wheel

Boundary rule — when not to use diamond

Diamond is the hardest abrasive and the correct choice for hard, brittle, non-ferrous materials such as cemented carbide, ceramics, glass, silicon, sapphire, ferrite, graphite and composites. It must not be used on ferrous metals — steel, cast iron, and their alloys — because carbon in diamond reacts with iron at grinding temperatures (roughly above 700 °C / 1300 °F). This chemical affinity causes rapid, abnormal diamond wear (graphitisation) and destroys the wheel. For steel, hardened steel, cast iron and other ferrous workpieces, use CBN (cubic boron nitride) instead.

Reference: full diamond wheel application matrix

Use this matrix to sanity-check the recommendation, or to specify wheels across several materials and processes. It is the same logic the tool applies.

Sub-table 1 — by material family

Material	Typical operation	Recommended bond	Grit (FEPA D)	Concentration	Typical Ra
Cemented carbide (WC-Co)	Cutter & tool grinding	Resin / Metal	D91–D181	100–150%	0.1–0.4 µm
PCD / PCBN	Edge prep, peripheral	Metal / Vitrified	D46–D91	125–150%	0.05–0.2 µm
Advanced ceramics (Al₂O₃, ZrO₂, Si₃N₄)	Surface / form	Vitrified / Resin	D64–D151	75–125%	0.2–0.6 µm
Optical / flat glass, quartz	Edge, bevel, CNC	Metal / Resin	D64–D126	75–125%	0.05–0.3 µm
Semiconductor (Si, SiC, sapphire)	Back-grind, dicing	Electroplated / Resin	D126–D400+	100–200%	<0.02 µm (fine)
Ferrite / soft magnetic	Surface / form	Resin / Metal	D91–D181	100–150%	0.2–0.8 µm
Graphite / carbon	Form / cut-off	Electroplated / Metal	D181–D301	75–125%	—
CFRP / composites	Cut, slot	Electroplated	D252–D400	—	—
Thermal-spray coatings	Grind, polish	Resin / Metal	D126–D252	75–100%	0.1–0.4 µm
Stone / engineered quartz	Edge, calibrate	Metal / Electroplated	D181–D400	—	—
Zirconia (dental / medical)	Finish, polish	Resin / Vitrified	D46–D126	75–100%	0.1–0.3 µm
Steel / cast iron (ferrous)	—	Not diamond — use CBN	—	—	—

Representative values for planning; confirm final grit, concentration and bond with a grinding trial on your machine.

How the selector decides

Decision	Rule
Abrasive	Ferrous (steel, cast iron) → CBN; hard non-ferrous → diamond
Bond	Long life / form → metal; cool finish → resin; precision → vitrified; thin → electroplated
Grit	Coarser for removal, finer for finish (FEPA D)
Concentration	Higher for hard materials and life, lower for delicate finishing
Shape	Chosen from the feature: 1A1 flat/OD, 11V9 flute, 6A2 dish, 1A1R cut-off

Always confirm the final specification with a short grinding trial on your machine.

Key takeaways for buyers & engineers

The material decides the abrasive: CBN for ferrous, diamond for hard non-ferrous.
Bond follows life and finish needs; grit follows the finish target.
Use the tool as a starting specification, then trial on your machine.

Quick selection checklist

Enter your workpiece material and operation.
Read the abrasive, bond, grit and concentration.
Heed the ferrous boundary warning.
Confirm the final spec with a grinding trial.

Need a custom specification? Send your drawing or current wheel marking and we will quote a diamond wheel to fit your material, machine and finish target — OEM, custom and private label supported.

Frequently Asked Questions

How do I choose a diamond grinding wheel?

Start with the workpiece material. If it is ferrous (steel, cast iron) use CBN, not diamond. For hard non-ferrous materials choose diamond, then pick the bond by life and finish needs, grit by finish, and concentration by removal and life.

What is the difference between diamond and CBN?

Diamond is the hardest abrasive and suits hard non-ferrous materials. CBN suits ferrous materials because it is chemically stable against iron, which destroys diamond at grinding temperature.

Which bond should I choose?

Resin for cool cutting and fine finish, metal for long life and form retention, vitrified for precision and re-profiling, and electroplated for thin or complex profiles.

What grit do I need?

Coarser grit (e.g. D151) for removal, finer grit (e.g. D64 or D46) for finish. Most general diamond grinding starts at D91-D126.

What concentration should I use?

100% is the standard default. Increase to 125-150% for harder materials, form retention and high volume; decrease for delicate fine finishing.

Is this tool free?

Yes. It runs in your browser and gives an indicative specification. Always confirm with a short grinding trial and the wheel maker.