2D Sketching

In the video, 2d sketching at 10:34 time stamp if I dimension the R45.5 curve it doesn't turn black but if I dimension the smaller R10.5 curve that one does turn black so Im not sure exactly why that is.

Hi Joel,

Difficult to tell exactly whats missing without seeing your screen, but it seems like sometimes fusion looses the link between the 3 sections at R45.5.

Try adding a concentric constraint between these curves and see if this helps, this basically means the centre of these curves will lie on the same point. they'll still need to be equal diameter to be fully defined (black).

Fully defining sketches can be a bit tricky at the start, but with some experience you quickly get a good feeling for what is required.

Connor,

If I attach the file do you think you could take a look?

Yeah no problem, send it through.

Connor,

It's not allowing me to upload so here's a link.

https://drive.google.com/file/d/15YJdY-rCqZKTe_RnyMOjycC78cFLcOkq/view?usp=share_link

Thanks

Hi Joel,

Only had time for a quick look, so not exactly sure why it's any different to mine.

But this is the most simple way to define the sketch from where you are.

I've had plenty of experiences with Fusion360 doing things differently one day to the next, sometimes you just have to work with it

Hope this helps.

Connor,

I'm now getting this error. Can you advise?

https://loom.com/share/e8a53cfbfdc349609675c08a44ee6644

Joel, right bottom corner is error message and it is clickable, right?

Yes it’s clickable but I see Connor didnt get that error with my file and I wasn’t get that error before so I’m not sure what has changed.

Joel, so - you made somewhere some error which Connor didn't.

since it is a simple and small part - may be try to start over? better choice would be investigate that error message and get it resolved, but it might include some googling and some trying...

I started off exactly where I sent Conner the file. It was working before and was not getting the error. I will just wait for his reply as he might have some insight on what’s causing the issue.

Hi Joel,

You may be looking at sketches slightly wrong, but what you've come across here will highlight an important point to help you in the future.

Keep in mind that you can have multiple sketches on the same plane, and these are completely different.

Although a newer on the timeline can reference features from the older sketch.

What you need to do when you open your file, is right click the existing sketch in the browser or timeline and click "edit sketch".

That way you are working on the existing sketch.

Where you went wrong was creating a new sketch on the same plane.

Since the previous sketch was visible in the browser you can obviously still see it, although the colours faded a bit.

Then you clicked to dimension the existing curve from the old sketch, which you can't edit unless you are editing that sketch directly.

Notice how the ends of the sketch came up in purple? this is because F360 is trying to reference them in the new sketch (this will make more sense as you progress through the course).

Side note, sometimes driven dimensions can be helpful to see how changing other dimensions changes the driven dimensions.

Hopefully this all makes sense.

Perfect I knew you would be able to tell me where I went wrong. I will give it a shot thanks Connor

Hi Connor,

I am also having issue getting the 2d sketch to fully define. The above mention of using the conentric constain function has worked for the R45.5 but I cannot seem to get the rest of it to define as it does in your videos.

Any advice would be great.

Thanks

Hi Jamal,

See screen recording attached. Sometimes you just need to drag the sketch around a bit to see what it needs.

Fully defined (or constrained), means that location and size of elements in the sketch are defined. Sometimes we draw a circle, but don't dimension it, so it's not "fully defined", or we located something but don't fix the reference point with at least two dimensions or a constraint like concentric, tangent, or coincident. If you've got blue objects, try to figure out what they are missing -- maybe moving them to be coincident with another object or guide (that has been dimensioned) is all it takes.

Thanks so much Connor and David for the tips it worked a treat!

I was having the same problem getting it to define, not the smaller outer circles, but the larger ones. I re did it 3 times from nothing and I am certain I did everything you did, even pausing it and going back 5 seconds many times, I was feeling very stupid. Anyhow that first screen recording you posted solved it for me using the circle constraint.

Feeling that I may struggle with this course if I have gone wrong already. Of course its just about experience as with anything, the more issues you face the more you learn.

Also had an issue where the vertical constraint didn't want to apply to the top circle, despite the previous day it was working fine. Never had that problem other times, managed to get it in the end but unfortunately I don't remember how.

Hi Ian, I wouldn't get discouraged with this, sometimes it's the program just being buggy or something small preventing what you want to do.

I'm going to have a look back over this module and maybe re-record it as something seems to have changed from when I first did it.

However, for everyone, I'd recommend using things like this to understand what's really going on and the intent and logic behind the actions of constraining things, you'll learn a lot more that way.