I've done it before. Make sure you select the two line segments and
not the intersection points.

Mark...one definition of a plane is that of 2 intersecting lines,
which is the only way a sketch fillet is usable, thus the two lines
must be coplanar by default.

Mark...one definition of a plane is that of 2 intersecting
lines, which is the only way a sketch fillet is usable, thus the
two lines must be coplanar by default.

What are you saying about usable? The sketch fillet tool
works between arcs, splines, etc, if they are co-planar.

My apologies, Dwight is correct about my "usable" statement being
incorrect. After testing for myself I realized that I had never
used the sketch fillet option with anything other than two lines.

That being said, Mark's statement is correct about the entities
being coplanar, but if the entities are coplanar and you are still
having problems, make sure you select the segments and not the
intersection point. I know that it works on the point in 2009 but
i'm pretty sure you had to select the entities in 2007.

There goes my new years resolution of being perfect...just kidding
of course...at least i've learned something.

That middle curve is not co-planar to the line, thus it
cannot be filleted with the fillet tool in a 3D sketch. Depending
on what you are trying to do, you can convert that middle segment
to a construction line, and then create curves by hand to create
the fillet.

However, if it is acceptable for what you are trying to draw, I
suggest doing a "fit spline" over the current geometry. Then you
can use the "simplify spline" tool, and simplify it a little bit.
Now you can drag the spline points to get an approximation for what
you are looking for. A spline will be very easy to modify.
Similarly, you could consider using a spline just for the small
area that you are looking to add fillets to.

Otherwise it is possible to use a tangent arc on other 3D sketch situations.

I've done it before. Make sure you select the two line segments and not the intersection points.

Mark...one definition of a plane is that of 2 intersecting lines, which is the only way a sketch fillet is usable, thus the two lines must be coplanar by default.

My apologies, Dwight is correct about my "usable" statement being incorrect. After testing for myself I realized that I had never used the sketch fillet option with anything other than two lines.

That being said, Mark's statement is correct about the entities being coplanar, but if the entities are coplanar and you are still having problems, make sure you select the segments and not the intersection point. I know that it works on the point in 2009 but i'm pretty sure you had to select the entities in 2007.

There goes my new years resolution of being perfect...just kidding of course...at least i've learned something.

Happy New Year, Group!

Here is the 3D sketch created in SW2007

Please find it and see if you guys can create a 3D fillet (in 2007)

Thx, Chris

## Attachments

However, if it is acceptable for what you are trying to draw, I suggest doing a "fit spline" over the current geometry. Then you can use the "simplify spline" tool, and simplify it a little bit. Now you can drag the spline points to get an approximation for what you are looking for. A spline will be very easy to modify. Similarly, you could consider using a spline just for the small area that you are looking to add fillets to.