Joel:
Your post is a little unclear, but I am assuming that you mean that the
width of a bar changes based on font or that the scale of the x axis
changes. You can fix both of these by setting the graphs properties. Right
click on the graph object and click edit:
Then to fix the scale of an axis: right click on the axis and choose
"format axis", for the scale of the x axis, you can set the font and number
of categories between tick marks. For the scale of the y axis you can set
the max and min number.
Right click on one of the bars or data points and choose "format data
series" in this dialog you can set the gap between the bars or data points.
This may impact the visibility of your labels if its too close so you can
also angle the text.
If I've missed what you mean by the graph "scaling" then repost.