Working with Purchased and Multipurpose Parts - Autodesk Inventor 2010: No Experience Required - page 270

option is off (the default), Inventor maintains the radius by pulling the face it
meets up into the radius. It's as if a fi llet was put around an object and then part
of the fi llet was milled off.
Rolling Ball Where Possible This option controls how corners are resolved
where multiple edges meet at a corner. With Rolling Ball Where Possible
selected, the corner shows a spherical radius that is the same as the edge radius.
With the option off, Inventor enlarges the corner and extends the radius back
down the edge to create a smoother appearance.
Automatic Edge Chain Automatic Edge Chain is on by default. When it's dis-
abled, selecting an edge won't automatically select edges that are tangent to it.
Preserve All Features Preserve All Features takes features that are affected by
the fi llet into consideration for the calculation. You would use this option pri-
marily when placing a fi llet has the effect of removing another feature. For
example, if you cut a notch into a face near an edge and then place a fi llet that
passes over the notch, the notch may disappear even though the notch is deep
enough that you expected it to remain. With this option turned on, the Fillet
tool recognizes that there is a cut that shouldn't be removed and calculates its
rounded face with the notch built into it.
Even with all the options and fl exibility, placing fi llets and rounds on a part
can be challenging to do exactly right. The order in which you place fi llets,
along with the numbers and combinations of edges you select, affect how the
fi llets appear on the model. This takes time to master, and you have to look at
the model to make sure you're getting the result you want. The good news is
that if it doesn't come out right the fi rst time, it's easy to try it another way.
Let's do a sampling of the different fi llet types on the part.
Adding Fillets to the Edges
For the same reasons you needed to add draft, you need to soften the external
edges of the part:
1. Start the Fillet tool from the Modify panel.
2. Using an edge fi llet, click the inside edge of the part as shown in
Figure 6.13.
3. Set Radius to .2 in, and click Apply to create the fi llet.
4. Change Radius to .1 , and pick the fi ve edges shown in Figure 6.14.
You may need to click the Pencil icon to be able to select edges.
Don't click OK or Apply after picking the edges.