Essentials of Manufacturing

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Centerless Grinding Guidelines
  1. The largest diameter of the workpiece should have the ground surface, if possible. This allows through-feed grinding.
  2. The axial length of a centerless-ground workpiece should be at least equal to the diameter. Short workpieces are more susceptible to surfaces that deviate from right circular cylindricity.
  3. Radii should be as uniform as possible in order to simplify wheel dressing and/or set up changes.
  4. For a flat at the end of a shaft, it is preferable to incorporate a matching flat on the opposite side of the shaft. This will prevent a high spot from forming opposite the flat. Alternatively, the flat can be brought inboard so that the end is a complete cylinder, as shown below in the right-hand view.

  5. Holes with diameter to depth ratios of over four should be avoided unless widening of the mouth of the hole can be accomodated, as illustrated below.

  6. As the following diagram shows, internal grinding should allow for as large a diameter tool support as possible. This illustration shows a hole with an entrance that is smaller than that of the ground area.

  7. When face-grinding turned surfaces, ground undercuts should be avoided. As the figure below shows, face undercuts require specially-dressed grinding wheels that are expensive to maintain and replace.

  8. If at all possible, blind holes should be avoided. If a blind hole must be implemented, the middle two geometries of the following diagram can help with grinding.

  9. The figure below illustrates how ends of in-feed ground parts need to be terminated for satisfactory results. The included angle of the pointy end should be less than 120 degrees. If in-feed grinding is not used, ends of cylindrical parts should not be ground.

  10. Some examples of dimensioned centerless-ground parts are shown in centerless grinding.

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