The content of my first sketch moved in to 2nd sketch. Now 1 sketch is empty

[tbenkerE2YG2]

Hi i have been trying to learn Fusion 360 for two weeks now to be able to design things to 3d print.  I learn mostly from some you tube tutorials. I have been able to design some complex ( for me) assemblies. I am not an engineer or designer. So far i am very happy with my progress and trying to learn more advanced techniques in designing and also fusion. 

Yesterday, i watched a respectable tutor who strongly recommended using multiple sketches instead of trying to fit everything in one sketch and clutter. It made sense and wanted to try it in my new project. An enclosure for a screen display and a bunch of leds surrounding it (sim racing dashboard with screen and leds). I plan to create 2 components. Component 1 : Face plate with window for screen and holes for leds and screws. Component 2: Box to accommodate screen arduino cables etc.

As i am also new to 3d printing I can not calculate tolerances accurately. So I Created a mock up component Face plate  trial. Which will have 4 additional leg if the screen will fit in as intended to with the dimensions i put in Cad. and use those dimensions to create the box. If it will be printed OK then i will remove those legs and print the final face plate. This is when i realized the issue i mentioned in the title.

1st sketch  should be only face plate with accurate dimensions for rectangles, outer edges and inner edges for screen.  There is a third rectangle between them as construction to mark the place for legs where the led holes should be.

I created the 2nd sketch on it. Same plane and origin but an other sketch I used the edges of the construction rectangle to create the l shaped legs for screen.

In 3rd Sketch, I used the  rectangles of 1st as markers and created holes. Once finished i started extrudin.

1st sketch extrude the face plate 2mm> body 1,  2nd sketch  second extrude legs>, body 2,3,4,5, 3rd sketch Cut holes to object face of body 1.   Then fillet etc. 

As everything went well I started to design the second component the box. I wanted to copy the rectangles from 1st sketch of the other  then I realized that it is empty. When i select 2nd one all the rectangles and legs are there. When i select body 1, both sketch 1 and 2 become highlighted. Some how all the content of 1 merged in to 2.

I double check visibility and it is not that. Tried to trace it back in the time line but i can find when that merge took place.  During  selection of cuts it asked me to if i want to capture positions but  i chose not to. And even if i delete al the timeline until that cut/extrude   the merge was there.

As the part i printed OK now i want to delete the sketch and timeline entries with legs and print the final version but i can not. 

Can someone explain why and how that merge took place and advice me whether if this is something I should  be worried/ careful about in my designs.

It become a long post. i am sorry. I do not know how to post the files here.

Thanks. 

[jhackney1972]

You can attach your model here using this process.  If you do not know how to attach your Fusion 360 model follow these easy steps. Open the model in Fusion 360, select the File menu, then Export and save as a F3D or F3Z file to your hard drive. Then use the Attachments section, of a forum post, to attach it.

[tbenkerE2YG2]

OK Thanks. I attached the file. The names are in Turkish and some characters may look weird. I create lots of components before ever sketching anything. Do not waste time looking at all.   I renamed the component name  as Problem component:1 for you to find easily.

Thanks again

[jhackney1972 · Accepted solution]

If you run the timeline back to the first sketch in your Problem Component, it is empty so I can only assume it was always empty.  Since nothing happened, in the timeline of this component, before this empty sketch I do not see anyway it could have been transferred.  I feel you simply created the sketch, left it, and mistakenly sketched the frames in the second sketch.

It does not hurt you to remove the empty sketch, adjust the sketch plane and move on.  The Model with this already done is attached.

[tbenkerE2YG2 · Accepted solution]

Thanks for the review.

I also though of that. I checked the first manual save when i started this component an there was only 1st. When i try to open the next version Fusion asks me if i want to open the recovery file instead. In either case the 1st was empty and 2nd one was merged. I assume something went wrong when i was away while working on the 2nd and fusion created a recovery as i was not aware continue as if there were 2 sketches.

Thanks for your reply and effort.