Sometimes you may have an Inventor assembly drawing where you would like to use a break out section to show part details deep within the assembly. This usually means that more than one part are covering the detail you wish to show. Inventor drawing can make quick work of this situation by using nested break out sections.
My model is an indexing gearbox assembly and I would like to show the key between the indexing gear and the drive shaft. The indexing gear is under the cover and the key is under the indexing gear. Lets get started.
Create an Inventor drawing of the assembly with the desired view.
Select the view, making sure it is highlighted in the browser, and select Create Sketch from the Place Views tab - Sketch panel.
You can use an sketching tool to create a connected boundary for the break out but I prefer an interpolated spline with numerous pick points to allow for quick boundary editing if it becomes necessary.
Finish you sketch and select the Break Out from the Place Views tab - Modify panel. Identify the view by selecting inside the view bounding box. You can also right click inside the bounding box and select Create View - Break Out if you desire. The break out boundry sketch is selected automatically, if not the sketch is not closed. Select the Depth option Through Part and select the part to be sectioned. In my case it is the gearbox cover. Select OK to finish.
If you wish to change your break out boundry, expand the Break Out view in the Browser, and right click on the sketch and select edit. If you used a spline for your boundry, this is a simple task of dragging points around in the sketch.
Next, repeat the complete process to create a break out section through the indexing gear to expose the internal key.
The last step to make this visually appealing, it to shade the view. Right click inside the view bounding box and select Edit View. Select Shaded from the Style section of the dialog box and OK to finish. Of course you can do this anytime during the process but I feel it is easier to work on the drawing view in a wireframe style.