Body doesn't move with sketch.

[TOwens777]

Early in my project I used sketches to create several cut outs from a body.   Due to a measurement error I am having to relocate a few of those cut outs.  I am using the timeline so I backed up to the original sketch in the time line and moved it to the new location.  To my dismay the cut out does not move with the sketch.  It remains in the old position.  Is this behavior designed?

Thanks!

[Anonymous]

Hi, I don't have access to Fusion right now, but I would find the feature in your timeline where the cut into the body was performed, and edit that and maybe try reselecting the modified sketch that is serving as the cutting tool.

Jesse

[Anonymous]

Also there are several ways to move a sketch, such as editing it and moving sketch geometry within the sketch, or moving a component that the sketch is in.  If the first way is how you're doing it, you shouldn't be having any problem, but the second way is more involved because of the change of the entire component coordinate system must be captured at the desired place in the timeline in the form of a snapshot.

Jesse

[TOwens777]

Jesse,  the first way is what I'm doing.  I'm just going back in the timeline to the original sketch and moving it.  Yesterday it was behaving erratically.  I would move the sketch and it would move it back.  It would move a 1/2" but not 3/4", some really weird stuff.  I tried again today and was able to move the sketch with no problems but it created a whole host of downstream problems. I think because I moved some bodies before without moving the sketch. Would you say as a practice, if you create your body from a sketch you should always move the sketch instead of the body?

[Anonymous]

In general I would say the best practice is to have sketches and related bodies in a component, then if need to move, do Component Move and focus on the bodies within components, not the sketches, to get alignment for the move operation, such as by using Modify > Align or joints.  

Jesse

[TOwens777]

Jesse, I've never worked with components before.  Can I create components at this stage or is that something I should have done at the beginning?

I'm modeling this tremolo right now.  I have a few different sketches and several bodies that it's comprised of.  Can I put these into a component? 

Do the bodies all have to be aligned with the sketches first?

[TrippyLighting]

Read THIS and come back with questions 😉

[Anonymous]

That project is turning out absolutely fabulous!  

It's good to start from the beginning, but you can also drag bodies into a new component (right click on top/parent component in browser tree and choose Make New Component).  Sometimes you can also drag sketches into a component, and the related bodies will follow.  For now, you can try doing body moves instead of component moves, the Align tool also works for body moves as well.  As for the particular problems you're having, it's basically impossible to say how to proceed without knowing exactly what is happening, and often being able to experiment.  That's why I said before if you can't share this model, to make a simplified one with the same issue to share. 

Jesse

[TOwens777]

Thank you Gentlemen!!!

Trippy,  I am reading that section now.  That would have been perfect for the tremolo.  I wish I had used components to begin with but I had no idea what I was doing when I started.

Jesse, I tried backing up and moving the sketches and it pretty much destroys the model.  Some really weird stuff happens with my guitar body.  It did a strange combination of the front and back pieces (that just so happen to look super cool!) 🙂  Unfortunately, it only affected half the body and God know's what else was out of whack.  I'm going to have to abandon my existing sketch for the tremolo. 

At some point I want to copy the tremolo to it's own model apart from the guitar.  That way I can use it on future designs.  That's doable isn't it?

I think I'm just going to move bodies at this point and creat new sketches when I add the remaining parts. Unless...  is there anyway to "unlink" the sketch from the body?  Then I can move it to where I want and use it for future parts withou screwing up what I have.

[Anonymous]

Yes to save the tremolo as its own model first create a new component and drag the body of the tremolo into that component, then right click on the component and choose Save Copy As.

One thing you could do regarding your sketch is while editing/in it, click drag box select all the desired geometry, and right click to choose copy.  Then in a newly created sketch right click and choose paste.  You can also use referenced parameters for dimensions that you want to keep the same between the two sketches.

Jesse

[TrippyLighting]

I thought the same when I started with Fusion. having worked with other CAD software did not prevent me from making the samew mistake - not working wth components - so I re-designed my first lamp esign in Fusion three times until I had it right ... or so I thought 😉

One thing to be aware of when making components out of existing bodies is that if you don't get the sketch into the component, you'll loose your design history when you export the file with "save as". that's why for mechanical parts such as tthe tremolo it is always a good practice to first create an empty component and then activate it.

Everything you add after that activation step will be recorded in the timeline,  provided you are not workig in direct modeling mode. All Sketches, Bodies, Joint Origins, Construction Planes etc. will be added to the actiuvated component.

If you decide to "save as" the component for re-use in another design, it will take all thoise objects and the timeline for that component with it so you retain your complete parametric nature of the component.

[TOwens777]

I appreaciate all the help but I think I'm done...  I'm really distressed at the moment. I think this model is unfixable.  I'm thinking I might have to start over.

I pulled a wrong measurment for the position of my tremolo.  Trying to reposition causes a number of problems. If I could reposition my original sketches and have the extrusion cuts follow I think I would be fine.  But, they don't.  The sketch moves but the extruded body or cut out stays in the same place.  I 'might' be able to patch the bodies and then redo my cut outs.  <Sigh>  I'm really at a loss.

I also wish I could clean up the timeline and get rid of a bunch of garbage that I created.  I attempted certain methods earlier only to delete but it leaves a trail of unused crap behind.  If I try to delete any of these unused bodies or sketches it creates havoc. 

Frustrating to say the least...

[Anonymous]

You're definitely taking a crash coarse in all of this, of which there is quite a lot, so don't be surprised if it gets really frustrating at times, and you have to sometimes redo things after having a better idea how to proceed.  You can of course reuse the complex bodies you made in a new design.  Also good to take lots of breathers 😉

I still don't know why a change in a sketch is not updating a Split Body Operation or similar.  The way I always try to figure stuff like that out is make a very simple model like I said, and figure out the behavior that way.

Good luck man!

Jesse

[Anonymous]

By the way you're probably the winner at doing the most complex design in an initial learning phase in the history of mankind!

Jesse

[TOwens777]

" By the way you're probably the winner at doing the most complex design in an initial learning phase in the history of mankind!

Jesse"  

Yea, I think I need a brain transplant!  A huge case of over-confidence on this one.

Ok, I took a break for a few minutes and came back.  The 3D gods must have felt sorry for me.  By some miracle I got my cut outs to move along with the sketchs.  I'm not sure how.  Nothing was working so I closed the model.  When I reopended an tried again it worked!  I had attempted this a few times before but to no avail.

But...  still some weird stuff.  Look at the pic I attached.  I moved the sketch and it moved but it made a copy of it in the old position.  I can't select the old copy to delete it. It doesn't affect the body.  The body reflects the new location.  Weird!

[Anonymous]

That is weird!

Jesse

[TOwens777]

I think the model is corrupted.  I went back to edit that sketch again and it's gone!  Completly blank!

[Anonymous]

Well that doesn't sound good.  As you probably know there should be previous versions you can revert to.  But sounds like your unusual modeling method is giving Fusion fits.

Jesse

[TOwens777]

Jesse, my unusual modeling method is called not knowing wha the h*ll you're doing. 

Ok, I'm making progress. I closed and restared the software and the weird sketch is normal now.  I don't think the file is corrupted. The way I accomplished this is probably just really screwed up. 

I've almost got this cavity relocation fixed but I'm having a weird issue (go figure.) You might remember I created my guitar bodies (front and back) through a combination of a solid body and a t-spline sculpt.  The finished bodies show as a single solid body. However, they still have the faces from the original bodies prior to the combine.  Look at the attached pic.  Is there anyway to combine the separate faces into one?  The problem I"m having is that I'm moving a sketch of the tremolo cutout on the back of the guitar to a new location.  One of the faces close to the neck doesn't show the new cut out.  I'm assuming it's since I did the original cutout before I combined that part of the sculpted body with the solid body that it's unaffected.

I think if I can combine those two faces the cut out will work correctly.  Can this be done?

[Anonymous]

Really hard to tell from just the pics.  One thing you can try is clicking dragging in the timeline to a new time position either the Combine feature or the cutout/body split feature in the timeline.  Sometimes you have to move multiple related features at once to do this, and sometimes you have to wait a little while when dragging to let Fusion calculate if such a temporal move is allowable.

Jesse