1) unit of abrasive size: mesh

 - The bigger mesh is, the smaller grit size is

ex) 140/170: Passing through 140mesh &  Not going through 170mesh mean 140mesh

This means grade of abrasive binding power.

The standard is N

Close to A, it's soft & Close to Z, it's strong

Wear Resistance is very important in grinding process

1) Good Bond: G/W with proper wear resistance shows long life

span & low grinding resistance as shown above

2) Hard Bond: G/W with hard bond has poor grindability

as shown above(No abrasive dropping out of bond after wearing)

3) Soft Bond: G/W with soft bond has short life span as shown above(Abrasive drops out of bond fastly and G/W’s wear is fast too)

Quantity of Abrasive per unit area

As per high concentration, grinding tool's life span & quality(shipping, surface roughness) are improved. But, grindability  gets worse and tooling cost increases.

Concentration : 100 = 4.4cts/cc

Grit vol=25%

Material for binding abrasive.

Classfied into Vitrified, Resinoid, Metal and Electroplated according to bond material.

Mainly used as bond, which is made of thermosetting phenol resin

Advantage: making the wheel efficient in grinding

process & making the wheel fine in surface roughness, chipping.

Demerit: Low wear resistance Polyamide resin with heat

resistance is used rather than phenol resin.

Binder made of copper, tin, tungsten carbide, iron and nickel

Retaining power & wear resistance of abrasive is high.

Used for precision cutting of concrete, stone, ferrite, glass, crystal, semi-conductor

No elastic deformation, excellent grindability,

intermediate performance between resinoid and metal

3 requisites for G/W(abrasive, binder, pore)

Excellent in strength, fragmentation, heat resistance, chip emission

Superb in truing, dressing

For workpiece with difficulty in grinding

Production of complicated shaped G/W is available.

Overhang from electroplated bond by 1/3 ~ 1/2 of abrasive diameter

Good chipping emission & grindability

Monolayer abrasive makes G/W's life span short.

Used for brake lining, ferrite, microscope, camera lens etc.