The actually chosen values are accessible through the live axis instance:
var chart = $("#chart").data("kendoChart");
var axis = chart._plotArea.categoryAxis;
var baseUnit = axis.options.baseUnit;
var baseUnitStep = axis.options.baseUnitStep;
Note that properties with underline are considered "private", i.e. subject to change. This includes the axis implementation as well.
That said, these in particular are pretty safe to use.
the Telerik team
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