Rules for Balloons (AutoCAD Mechanical Toolset)

Rules for balloon selection.

• The balloon you select must be within the drawing border you selected in step 1 of the wizard.
• The selection set must contain at least the balloon text, balloon circle or reference line, and the leader, and they must be from the same balloon. The arrowhead is optional.
• The selection set must contain only 1 text object, and that must be the balloon text.

General rules for balloons

• The balloon type must be the same across all drawings corresponding to a single reference drawing.
• Balloons should not overlap the parts list area or title block area.
• The leader length should be significantly larger than the balloon text height.
• There can be no more than 3 leader segments for a single balloon.
• A balloon must have a corresponding parts list entry or else that balloon is not migrated.

Rules for linear balloons

• The angle between the reference line and the leader must be between 90 and 180 degrees.
  
• The length of the leader must be significantly longer to that of the balloon size.

• All reference lines must be horizontal.
• The distance between reference lines in the collection must be the same.
• All reference lines must be either left aligned or right aligned.
• All reference lines must be connected by a vertical line on one side.
• The spacing (Gap) between reference lines must be greater than the text height, but less than 2 times of text height.
• The leader must be connected to the first or last reference line of the collection.
  

• All reference lines must be horizontal.
• All reference lines must be in line with each other.
• Balloon text must be located above each reference line.
• Balloon text cannot be repeated within a single balloon collection.
• The leader must be connected to the first or last reference line of the collection.
  

Rules for circular balloons

• The balloon circle must be the same size across all balloons within the drawing border.
• No geometry can intersect the balloon circle.

• The distance between the center points of adjacent balloons should be the same.
• The center point of all balloons in the collection must be aligned to each other.
• The leader must connect to the first or last balloon of the collection.