Place Centerlines and Center Marks

1. On the ribbon, click Annotate tab Symbols panel Centerline .
2. Move your cursor over the center of the upper left hole in the section view. When the green-filled circle appears, indicating that you are directly over the center point, click to select the first point of your centerline.
   Tip: After clicking on the Centerline command, you can optionally click to select the circle first. You can then more easily select the circle center with a second click.
   
3. Move your mouse to the right until you are over the center of the upper-right hole in the section view. When the green-filled circle appears, click to select the endpoint of your centerline.
   
4. Right-click to display the context menu.
5. Select Create to complete the placement of the centerline.
   
6. Repeat steps 2-5 to place a similar centerline between these same two holes in the front view.
7. Click Annotate tab Symbols panel Center Mark .
8. Move your cursor over the center of the cylindrical feature in the lower right of the section view. When the green-filled circle appears (to indicate that you are directly over the center point) click to place a center mark.
   
9. Repeat the previous step to place a center mark on the inside cylindrical radius and on these same locations in the front view.
   

With centerlines and center marks in place, it is time to place dimensions.

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Parent topic: Drawings