Lateral play (slop) – unequal (machine error)
Plot
If the plot has unequal amounts of Lateral Play on the same axis, this can lead to a heart/teardrop shaped plot as shown below. The factors that affect this type of plot will be the same as those for Lateral play (slop) – equal.
Diagnostic values
The diagnostic values for all types of Lateral Play are quantified in the same way, therefore these are the same as for Lateral play (slop) – equal. However, Unequal Lateral Play can be identified by a difference in the values for the positive and negative elements of a single axis. For example:
Lateral Play (µm)
X +0.9 -0.7
Y +30.0 +15.0
Note that the measurement made for Unequal Lateral Play is not shown on the diagram as it cannot be shown easily.
These values are typical for Unequal Lateral Play in the Y axis, as shown above. The Y value is not equal to the Y value.
Cause
The causes of Unequal Lateral Play are the same as for Lateral play (slop) – equal.
Effect
The effects of Unequal Lateral Play are the same as for Lateral play (slop) – equal, except when the amount of play varies along the axis in question.
Action
The action that should be taken if you identify Unequal Lateral Play is the same as for Lateral play (slop) – equal.