Abrasive Wheels
All abrasive wheels must be inspected and "ring-tested" before mounting to ensure that they are free from cracks or other defects.
Ring Testing
The spindle speed of the machine also must be checked before mounting the wheel to ensure it does not exceed the maximum operating speed marked on the wheel. Always follow the manufacturer's recommendations.
To test the wheel, do the following:
- Tap the wheel with a light, non-metallic instrument.
- A stable and undamaged wheel will give a clear metallic tone or ring.
- If the wheel sounds cracked or dead, it must not be used because it could fly apart when operated. Dispose of it and use another wheel.
To prevent an abrasive wheel from cracking, it must fit freely on the spindle.
Wheel Explodes Causing Fatility
- The spindle nut must be tightened enough to hold the wheel in place without distorting the flange.
- Always follow the manufacturer's recommendations.
- Ensure that the spindle speed of the machine will not exceed the maximum operating speed marked on the wheel.
An abrasive wheel may disintegrate or explode during start-up. To make sure you do not get injured during startup, do the following:
- Allow the tool to come up to operating speed prior to grinding or cutting.
- Never stand in the plane of rotation of the wheel as it accelerates to full operating speed.
Abrasive wheels must be supplied with sufficient power to maintain the spindle speed at safe levels under all conditions. Do not run a wheel or blade faster than its maximum rated capacity.
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5-3. When mounting an abrasive wheel what must you do?
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