Hi Kevin,
You have to set the View object in this case - for example:
someChart.Axis(StandardAxis.PrimaryY).View = new NRangeAxisView(new NRange1DD(0, 100), true, true);
will limit the axis to the range 0, 100. You may also consider to turn off tick rounding for the scale.
Let us know if you meet any problems.
Best Regards,
Nevron Support Team