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Stroke Honing Impact on Bore Shapes

Honing Geometry Adjustments

• Taper: One end has a larger diameter than the other end. This is resolved by modifying the stroke length or dwell time.
• Out-of Round: Normally caused by expanding at too fast of a rate, abrasives that are cutting poorly or the way that the part is supported (tooling, fixtures).   Expanding at too high a rate will deform thin wall parts causing them to go out of round or change size when the pressure is removed.
• Straightness: Bowed or Axial straightness is related to the axis of the bore. Once this condition exists, the tooling will normally follow.  Longer stones are used to help straighten.
• Cylindricity: A value which includes roundness, straightness and taper in relation to a surface outside the bore.   This is not normally affected by Honing.

Use Stone Travel to Adjust Geometry

How Stone Travel Affects Geometry

• Stones normally over-travel the ends of the bore by 1/3 of the stone length
• Blind bores cannot over-travel so Dwell, Short Stroking or Adjustable Tooling must be used to keep the bore straight
• Too much over-travel creates a Bellmouth Bore
• Too little over-travel creates a tight spot at the end.
• If stones are so long they do not clear the center of the bore, a barrel shaped bore will result

Bore Shapes

• These shapes result from various stroke adjustments

The Effect of Honing on a Bore