Place Centerlines and Center Marks

1. On the ribbon, click Annotate tabSymbols 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.
   TipAfter 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 tabSymbols 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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