How to constrain geometry to a sketch in assembly?

[Anonymous]

I am trying to constrain the axis of a bolt hole on one part to a sketch point on another part in an assembly. Using 'Constrain' only allows me to constrain geometries like axes an faces. I can't see where it would allow me to select a point of a visible sketch with which to constrain the bolt hole axis, contrary to the following post on the Autodesk website:

https://knowledge.autodesk.com/support/inventor-products/learn-explore/caas/CloudHelp/cloudhelp/2016...

I'm sure I could figure out some convoluted creation of working planes, but if there is actually a way to constrain to the sketch that would be helpful in many projects. For clarity, the axis of the bolt hole is to align with a marked position along a slot in a mounting arm. The only constraining geometry that Inventor sees right now are the center axes of the rounded ends of the extreme ends. However, I need to position the mating bolt hole at intervals that can only be marked with a sketch. 

Thanks in advance! 

[jhackney1972 · Accepted solution]

The article you paste a link to refers to constraining a part which is purely a sketch or a sketch block.  Since the sketch is all the part contains, you can constrain it to another part in an assembly.  The part can be a 3D model or another sketch part.  This how you do layout design, one of Inventor's Top-Down design methods.  You cannot however place assembly constrains to a free sketch on a part.  This is because the sketch is defined in the part only and not in the assembly.

In my Screencast I suggest that you use your sketch points to locate work points, these can be use to place assembly constraints.

[Anonymous · Accepted solution]

What a great explanation! I've never used work points before. This is a great feature. Thank you for taking time to put together such a thorough response to my question. It was perfect!

[Anonymous]

I know this thread is almost 3 years old but I just wanted to thank you for this solution. I've been searching for about 3 hours trying to fix this problem, and your post was the only one that brought up work points and axes. Thank you again.