Wheel Selection
The Model H4378 only accepts
Aluminum oxide and silicon carbide wheels are marked in a somewhat uniform manner by all the major manufacturers. Understanding these mark- ings will help you understand the capabilities of various wheels. Always refer to the manufactur- erÕs grinding recommendations when selecting a wheel for your project.
The basic format for wheel numbering is:
Prefix | Abrasive | Grit | Grade | Bond |
| Type | Size |
| Type |
|
|
|
|
|
1 | A | 60 | L | V |
|
|
|
|
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The Prefix is the manufacturerÕs designation for a particular type.
The most common Abrasive Types used are A for Aluminum Oxide and C for Silicon Carbide, and occasionally SG for Seeded Gel.
The Grit Size is a number that refers to the size of the abrasive grain in the wheel. The lower the number, the coarser the wheel. 10 is a very coarse wheel for roughing and 220 is usually the upper range for fine finish work.
Grade is an indication of the hardness of the wheelÑÒAÓ being the softest and ÒZÓ being the hardest.
Bond Type refers to the type of bonding material used to hold the abrasive material. Most general purpose wheels will have a ÒVÓ indicating Vitrified Clay is used. Vitrified Clay provides high strength and good porosity. The other common bond type is ÒBÓ for resin where synthetic resins are used. These are used to grind cemented carbide and ceramic materials.
There may be other numbers inserted that have meaning for a particular type of wheel. Refer to the manufacturerÕs technical data for a complete explanation.
H4378/H4379 Slimline Bench Grinder |
