Ring Speed Test

Ring Speed Test

How to 'ring test' a grinding wheel

Ring Speed Test

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Grinding wheels must be inspected and 'ring-tested' before they are mounted to ensure that they are free from cracks or other defects. Wheels should be tapped gently with a light, nonmetallic instrument. A stable and undamaged wheel will give a clear metallic tone or 'ring.'

That distinctive ring comes from the hardness of the material in the wheel and its ability to transmit sound vibrations. If the wheel is cracked, the vibrations stop at the crack and there is no ring. However, a ring test may not detect all defects in a wheel, so a careful visual inspection is also necessary.

Before mounting the wheel, check the machine's spindle speed to ensure that it does not exceed the maximum operating speed marked on the wheel.

After mounting the wheel, stand to the side of the machine when powering it on in case a crack or defect was not detected.

Performing the ring test


Make sure the wheel is dry and free of sawdust or other material that could deaden the sound of the ring.

You will need a hard plastic or hard wood object, such as the handle of a screwdriver or other tool, to conduct the test. Use a wood mallet for heavier tools. Do not use metal objects. M4l ableton.

  1. Suspend the wheel on a pin or a shaft that fits through the hole so that it will be easy to turn, but do not mount the wheel on the grinder. If the wheel is too large to suspend, stand it on a clean, hard surface.
  2. Imagine a vertical plumb line up the center of the wheel.
  3. Tap the wheel about 45 degrees on each side of the vertical line, about one or two inches from the wheel’s edge. (Large wheels may tapped on the edge rather than the side of the wheel.)
  4. Turn the wheel 180 degrees so that the bottom of the wheel is now on top.
  5. Tap the wheel about 45 degrees on each side of the vertical line again.

Ring Doorbell Speed Test

The wheel passes the test if it gives a clear metallic tone when tapped at all four points. If the wheel sounds dead at any of the four points, it is cracked. Do not use it.

Where can I find the requirement?

Bandwidth Place Speed Test

See 1926.303(c)(7), Abrasive wheels and tools