Wheel Selection | Wheel Inspection |
The Model H7762 only accepts Type 50 wheels with a 11⁄4" bore.
Aluminum oxide and silicon carbide wheels are marked in a somewhat uniform manner by all major manufacturers. Understanding these mark- ings will help you understand the capabilities of various wheels. Always refer to the manufactur- er’s grinding recommendations when selecting a wheel for your project.
The basic format for wheel numbering is:
Prefix | Abrasive | Grit | Grade | Bond | |
Type | Size | Type | Type | ||
| |||||
Type 1 | A | 60 | L | V |
Before mounting a new grinding wheel, it must be inspected. DO NOT assume that a wheel is in sound condition just because it is
The most effective way to check for damage is to give the wheel a Visual Inspection. Look for any cracks, chips, nicks, or dents in the surface of the wheel. If you see any of these, however minor, DO NOT use the wheel. Ideally a new grinding wheel will be in almost flawless condition.
Replacing Wheels
The Prefix is the manufacturer’s 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. Grit sizes range from 10, which is a very coarse grit used for roughing, to 220, which is usually the upper range for fine finish work.
Grade is an indication of the hardness of the
Bond Type refers to the type of bonding material used to hold the abrasive material. Most general purpose wheels will have a “V” indicating Vitrified Clay is used. Vitrified Clay provides high strength and good porosity. The other common bond type is “B” 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 manufacturer’s technical data for a complete explanation.
H7762 Heavy Duty Tool Grinder
The hazards of using a damaged wheel include flying chunks of sharp abrasive material that could cause serious injury or death. Inspect every grinding wheel before it is mounted and DO NOT use a damaged grinding wheel!
The wheel guard assembly must be removed in order to mount or dismount a grinding wheel.
To remove/mount a wheel:
1.DISCONNECT MACHINE FROM THE POWER SUPPLY!
2.Remove the work table by unscrewing the two hex nuts on the underside of the table.
3.Unscrew the four bolts that fasten the grind- ing wheel to the connector plate.
4.Carefully slide the grinding wheel free from the arbor.
