For a SplineArea scrolling chart, show minute graduation on x-axis, but plot points every 6 seconds

Question

I'm playing around with the MSChart library, and have created a chart that scrolls on the x-axis when a limit is reached:

    foreach (Series series in chart1.Series)
    {
            if (series.Points.Count > numberOfPointsInChart + 1)
            {
                series.Points.RemoveAt(0);
                chart1.ChartAreas["Default"].AxisX.Minimum = pointIndex - numberOfPointsInChart - 1;
                chart1.ChartAreas["Default"].AxisX.Maximum = pointIndex;
            }

            series.Points.AddXY(pointIndex, random.Next(0, 50));
    }

I now need to convert this to a chart that shows five point on the x-axis for 5 minutes, but the plotted points need to be every 6 seconds. So for every minute-division on the x-axis, 5 points will be plotted, without those plotted points showing as labels on the x-axis.

My question: Is this possible? And if it is could someone please point me in the right direction?