By default, axes try to avoid label overlapping by hiding some labels so there is enough space to plot the rest.
You can disable this automatic "anti-overlapping" feature by setting the LabelsSeparation property to zero:

TChart1.Axis.Bottom.Labels.Separation = 0

Other techniques to avoid overlapping could be setting the axis labels rotation angle to 90 degree to make them vertical:

TChart1.Axis.Bottom.Labels.Angle = 90

Use the axes "CalcXSizeValue" (for horizontal pixels) or "CalcYSizeValue" (for vertical pixels) functions.

The default formatting string for axis labels is this: #,##0.###

When you have very small values ( like for example : 1E-09 ), the above formatting string returns always the same format, as the values precision is more than 3 decimals ( ### ).

So, changing it to a suitable formatting specifier (like 0.################## ) or setting it to empty will show the labels correctly.

TeeChart won't automatically adjust the stepping interval for Labels but you can use the OnZoom  and OnUndoZoom events to adjust Labelling.
Assume we have a Chart with these Label characteristics:

 With TChart1.Axis.Bottom
   .ExactDateTime = True
   .Increment = TChart1.GetDateTimeStep(dtOneMonth)
   .Labels.DateTimeFormat = "mmm-yyyy"
 End With

...and we want to modify the Label interval if the Zoom area is less than 31 days. Put the following code in the OnZoom event.

Private Sub TChart1_OnZoom()
 With TChart1.Axis.Bottom
   If .Maximum - .Minimum <31 Then 'eg. less than a month .' 
    .Increment="TChart1.GetDateTimeStep(dtOneWeek)" 
    .Labels.DateTimeFormat="dd-mmm-yyyy" 
   End If 
 End With 
 End Sub

You can achieve what you need by using the Label Size property to fix the width of the Left Axis Label space to be the same on each Chart (thus aligning them). Example:

TChart1.Axis.Left.Labels.Size = 30
TChart2.Axis.Left.Labels.Size = 30

Specific Logarithmic labels need to set with the OnGetNextAxisLabel.
eg.
Assuming this data:

  TChart1.Series(0).Add 0.002, "", clTeeColor
  TChart1.Series(0).Add 0.0035, "", clTeeColor
  TChart1.Series(0).Add 0.005, "", clTeeColor
  TChart1.Series(0).Add 0.007, "", clTeeColor

Setup the Axis:

  TChart1.Axis.Left.Logarithmic = True
  TChart1.Axis.Left.TickOnLabelsOnly = True
  TChart1.Axis.Left.SetMinMax 0.001, 10

New in TeeChart Pro v5 ActiveX Control is the ability to display axis labels in exponent format with super-script fonts. This is especially useful when created logarithmic Charts and can be achieved with the following two lines of code:

  TChart1.Axis.Left.Labels.Exponent = True
  TChart1.Axis.Left.Labels.ValueFormat = "00e-0"