Creating 2D Drawings from 3D Data - Inventor 2013 and Inventor LT 2013 Essentials - page 47

Most of the tools you will be using are located on the Annotate tab. This is one
time where Inventor doesn't automatically change the active tab, because every-
one uses the detailing tools differently.

Center Marks and Centerlines

You often need to add geometry to the drawing views to assist in locating dimen-
sions. The next several exercises will walk you through the most commonly used
tools for this purpose: center marks and centerlines.
Center marks make it easy to locate the center of a hole or radius.

Certification
Objective

1. Make certain that the 2013 Essentials project file is active, and then
open c02-09.idw from the Drawings\Chapter​2 folder.

2. Click the Annotate tab in the Ribbon to change your active tab and
see the Annotation tools.

3. Zoom in on the bottom view in the lower left of the drawing.

4. Click the Center Mark tool on the Symbols panel of the Annotate tab.

5. Move your cursor near the edge of one of the holes. When it highlights,
click your mouse to place a center mark.

6. Repeat to place center marks on all four holes, as shown in Figure 2.16.

7. To connect the center marks, drag the center mark extensions toward
each other.

Now that you've added and edited center marks for a basic rectangular hole
pattern, you can move on to bolt circles.