2011

Table Of Contents
a gap between the arc and arc extension line is made. The size of the gap
drawn is controlled with the DIMEXO system variable.
Control Centerlines and Center Marks
Depending on your dimension style settings, center marks and lines generate
automatically for diameter and radius dimensions. They are created only if
the dimension line is placed outside the circle or arc. You can create centerlines
and center marks directly with the DIMCENTER command.
You can control the size and visibility of centerlines and center marks on the
Modify Dimension Style dialog box, Symbols and Arrows tab, under Center
Marks. You can also access this setting with the DIMCEN system variable.
The size of the centerline is the length of the centerline segment that extends
outside the circle or arc. It is also the size of the gap between the center mark
and the start of the centerline. The size of the center mark is the distance from
the center of the circle or arc to the end of the center mark.
1474 | Chapter 31 Dimensions and Tolerances