How to move an inserted component at a later time?

[twitos]

Hi,

I designed a part which consists of a series of rings stacked on top of each other. Then I INSERTED that component in a new project in order to make a mold for this component (so, basically, the negative of that part).

EDIT: At insertion time, I decided to rotate the part 180 degrees, so that the top was the new base and the base (in the original component) was now at the top of my mold. After that rotation, I did a translation in order to have the new base (the top in the original component) sitting right on the red axis, so that I could build the mold around it.

However, later I decided to adjust the height of that initial component. After I shortened it, Fusion lifted the bottom (making my part not "sitting" on the origin of the mold anymore) instead of shifting down everything from the on top toward the X axis.

See attached image. The purple part should be sitting on that red axis.

I tried rewinding the timeline until my 1st operation (which was the insert of the component, with the "free move". From there, I tried to Modify --> Move --> (Component) --> Point to point

The component moved where I wanted it, but as soon as I "forward" the timeline, it returns to where it originally was.

What am I missing?  I suppose I need to adjust the origin and move it down? Or ground the part?

Thanks

PS I haven't used the "ground" nor the "capture position" features. Should I have grounded the part?

[wmhazzard]

Please attach an f3d file of your model, it will be much easier to diagnose that way. 

[twitos]

For various reasons I'd like to hold on doing this, but your comment made me realize something after reviewing my timeline.

The base part itself was designed the other way around (upside down), like so:

So what I really did when designing my mold is insert the component, ROTATE IT 180 degrees, and THEN moved it vertically so that the "top" (now, upside down, being the base) was sitting on the red axis.

It makes sense, then, that when I modify the height of the base part, it shrinks toward the top (keeping its original base fixed).

Is there a way for me to adjust where the base part is sitting?

Thanks

[etfrench · Accepted solution]

The easy answer is to stop using the Move (or Align) command to position geometry.  Use a joint. 

The second easy answer is to stop worrying about up and down.  Think relative positions.  In other words, when two components are in the correct position relative to each other, it doesn't matter how you view them.  If you don't like the current view, rotate the view cube to the view you like.

p.s. If you don't like having the Top on the Bottom, you can simply redefine Top and Bottom in the View Cube.

[twitos]

@etfrench you were totally correct. I was asking the wrong question, or looking at it the wrong way.

After watching a few videos and playing around, I now realize that grounding my first part, and then using joints to join the other parts to place them at the correct position is the way to go.

Thank you for your advice.