Grinding Wheels

Product Selection Guide
Types of Grinding Wheels
Grading
Grit Type and Size
Concentration
Bond

 

grinding wheel product selection guide

As the correct product choice is critical for optimal performance, great care should be taken during selection. Bass Abrasives’s specialist staff are available at all times, & will gladly assist you with fine-tuning your requirements. The following information will help us make an informed specification for the correct wheel for your application.

As determined by International Standards, Superabrasive grinding wheels are described as in the following example :

Wheel Type Diameter in mm Overall Thickness Bore Size Abrasive Rim Dimensions Grading User Specified
12A2 125 18 20 W=6, X=3 B91 C100 BWET E=10, J=60

Types of Grinding Wheels

TYPE 1 Peripheral grinding, Profiling or Slitting
TYPE 2 Side grinding
TYPE 3 Peripheral grinding
TYPE 4 Side or Peripheral grinding
TYPE 6 Side grinding
TYPE 11 Cup or flaring cup (Side)
TYPE 12 Side grinding
TYPE 14 Peripheral grinding, Profiling
Scan of Diamonds

Grading

Diamond or CBN ? (D or B prefix to grade)High particle strength & sharp cutting characteristics provide high productivity & super-efficiency when the following metals are machined by :
Diamond :Non-ferrous metals such as Tungsten Carbide, as well as ceramics & glass.
CBN : Ferrous (containing iron) metals : hardened carbon & alloy steels, high speed steels, cast iron, tool & die steels, superalloys & hard stainless steels.

ABOUT DIAMONDS

Diamonds are the hardest material known to humankind. Composed of carbon, they are formed at great depths in the earths crust after being subjected to extreme heat & pressure, and are then transported to the earth’s surface via volcanic pipes. The average diamond content of a diamond-rich ore is only 1 part in 20 million, making the recovery of this precious mineral an expensive exercise ! Fortunately, man-made (synthetic) diamonds are now being produced to stringently high standards, & whilst they maintain all the qualities of the natural product, they offer a wider variety of grit types, shapes & friabilities to cater for particular tool grinding applications.

ABOUT CBN

CBN is the second hardest known material, but occurs only as a synthetic product & has never been found in nature. It is formed under similar conditions as synthetic diamond, the difference being that in CBN some carbon atoms are replaced with boron & nitrogen atoms as nearest neighbours. Because of it’s chemical nature, CBN presents no affinity to low carbon steels, & this explains why it is used with great success in the grinding of high speed steels.CBN is harder than conventional abrasives at ambient temperatures, & maintains this hardness over a wide temperature range.

Grit Size   

 

The choice of grit size is determined by the finish & amount of stock removal required, & affects the hardness & wear-resistance of a grinding wheel. It is basically divided into rough, medium, fine & polished grinding finishes. “Roughest acceptable finish” should be the deciding factor when choosing the grit size of grinding wheels, as finer grits have lower stock removal rates & higher wear rates.

List of Grit Sizes

DIAMOND CBN
FEPA STD MESH SIZE APPLICATION

FEPA STD

MESH SIZE
APPLICATION

D7

1400-1800
POLISH GRINDING

D15

1000-1400
POLISH GRINDING

D20

800-1000
POLISH GRINDING

D30

500-800
POLISH GRINDING

D46

325-400
FINE GRINDING

D46

325-400
FINE GRINDING

D54

270-325
FINE GRINDING

D54

270-325
FINE GRINDING

D64

230-270
FINE GRINDING

D64

230-270
FINE GRINDING

D76

200-230
MEDIUM GRINDING

D76

200-230
MEDIUM GRINDING

D91

170-200
MEDIUM GRINDING

D91

170-200
MEDIUM GRINDING

D107

140-170
MEDIUM GRINDING

D107

140-170
MEDIUM GRINDING

D126

120-140
MEDIUM / ROUGH GRINDING

D126

120-140
MEDIUM / ROUGH GRINDING

D151

100-120
ROUGH GRINDING

D151

100-120
ROUGH GRINDING

D181

80-100
ROUGH GRINDING

D181

80-100
ROUGH GRINDING

D252

60-80
ROUGH GRINDING

Concentration

The concentration of a diamond grinding wheel or a CBN grinding wheel directly determines it’s performance capability.

The choices available are :

SYMBOL
DESCRIPTION RECOMMENDED APPLICATIONS
C125
HIGH CONCENTRATION Profile or creep feed grinding, cutting. Small area of contact up to 4mm.
C100
HIGH CONCENTRATION Profile or creep feed grinding, cutting. Small area of contact up to 6mm.Tool face grinding for increased life of wheel. Wet grinding.
C75
MEDIUM CONCENTRATION Surface, cylindrical  or tool grinding, saw & knife sharpening.
C25-50
LOW CONCENTRATION Fine & polish grinding. Large area of contact. Higher than recommended peripheral speed.
  *** The operator may choose to apply high concentration wheels to a large area of contact – this is dependant on individualoperator preferences.

Bond  

Bass Abrasives offer various bonds to suit the wide variety of grinding applications. These range from friable,

free-cutting bonds (suitable for dry grinding & polishing) to harder bonds (wet grinding & small areas of contact).

Contact us for more information.