Simple Sketch that I Cant Fully Constrain

Simple Sketch that I Cant Fully Constrain

russellharris19
Contributor Contributor
295 Views
10 Replies
Message 1 of 11

Simple Sketch that I Cant Fully Constrain

russellharris19
Contributor
Contributor

Apologies for the basic question from a newbie. Day 2 using Fusion and on my unlucky 13th simple practice sketch. All lines are black but I cannot get the fully constrained icon. I've tried the "Sketch.ShowUnderConstrained" command but even though it tells me there's a curve and 2 points under constrained it isn't highlighting them on the screen. There are only two circles and an arc and I've tried every other way to constrain them and I get the message it's over constrained. Any help would be greatly appreciated. Do you need to make sure every sketch is fully constrained? Thanks for any help and replies.

0 Likes
Accepted solutions (1)
296 Views
10 Replies
Replies (10)
Message 2 of 11

g-andresen
Consultant
Consultant

Hi,

please share the file for reply

File > export > save as f3d on local drive > attach to post

 

günther

Message 3 of 11

jhackney1972
Consultant
Consultant

The Constraining of your Fusion model sketches fully is generally a very good practice.  Trying to get the Browser Full Constrained Icon is not always something to worry about.  In the attached Animated GIF I show the important geometry is fully constrained but the Icon is missing in the Browser.  The reason is that I did not give either of the construction lines a length description.  This makes little difference to the sketch but it prevents the icon from showing up in the Browser.

 

No Icon.gif

 

John Hackney, Retired
Did you find this post helpful? Feel free to Like this post.
Did your question get successfully answered? Then click on the ACCEPT SOLUTION button.

EESignature

Message 4 of 11

russellharris19
Contributor
Contributor

Thanks for your replies @g-andresen @jhackney1972 . I re drew that one and made sure it fully constrained as I went and it got the browser padlock icon. All the lines were black on the first attempt. Should I accept that or push for the browser padlock icon? I am however now stuck on sketch 14 😁. I'll share the file and if you get a chance to look at it then great but no problem if not. I've drawn all these on AutoCAD quite easily over the years but finding it quite a jump to Fusion. I have it fully constrained to this point but as I trim I lose all constraints. Thanks again guys.

0 Likes
Message 5 of 11

davebYYPCU
Consultant
Consultant

When you have symmetry within the sketch, it is more efficient to draw a centre lIne, use diameters, where possible, fillet in the modelling window.

When revolving the chamfer could be omitted as well.  Lazy efficient is a good thing.

 

dhfsdb.PNG

dhfsdb2.PNG

 

When done right no black dots on boundaries, just arc / circle centers.

I suspect big black dots are where the problem lies, and be careful of overlapping duplicate lines, one will be fully constrained, but another would not be.

(Check the 3 - 19mm dimensions for the same lines)

For beginners, One sketch per feature is recommended, so they are much easier to constrain.

 

Might help... 

0 Likes
Message 6 of 11

russellharris19
Contributor
Contributor

Thanks @davebYYPCU . Appreciate the tips. So maybe sketching too much initially? I notice adding fillets changes a lot of constraints so are fillets better to add after extrusion? Thanks again.

0 Likes
Message 7 of 11

davebYYPCU
Consultant
Consultant

Yes, modelling tools are way more efficient than individually constraining, each sketch instance.

 

Might help….

0 Likes
Message 8 of 11

russellharris19
Contributor
Contributor

Thanks again @davebYYPCU .

0 Likes
Message 9 of 11

russellharris19
Contributor
Contributor

Morning, In case anyone does read this I solved the problem by using construction geometries and then drawing arcs instead of trim circles. Have attached the completed sketch. I know it was simple but a helpful learning curve for me. Thanks to everyone who replied.

0 Likes
Message 10 of 11

davebYYPCU
Consultant
Consultant
Accepted solution

 I solved the problem by using construction geometries

If this is Sketching as a test example, then you can still clean it up a lot.  (Advice not critical)

 

neoldb2.PNG

 

Highlighted in yellow, 

You should not have black dots on any boundary that is not a centre point, Fusion hides all the points that are connected, (Coincident)

Use inclined dimensions as a last resort, (95 off the origin at an angle) The line coming down at 3 o'clock should be coincident on the circle, tangent and no dot.

The 14 and 26 dimensions on the left can be replaced with Equals Constraint, do one, make the others the same.

You have a 60 rad construction circle, and 120 diameter dimensions doing the same thing.

You also did the outside circle and then added over the top 4 arcs - between the bosses, (overlapping stuff is super hard to find when I didn't draw it)

You have a black point inside the right side hole - not on the original.

My oval highlight - 2 fillets where they are not needed, but if you are putting them in there should be 3.  (Both ends of the 22 high line.)

and lots of angle dimensions that are duplicated.

 

You only had to copy the original.  You have not been efficient, or lazy, yet.  if making the part, it would be streamlined like this, because of the modelling tools.

 

neoldb.PNG

 

Sketch origin should be where the dimensions come from, most come from the left side big circles.

The Hole Boss is the 2nd Extrude, the hole is on a centre point, Hole tool has lots of options to add countersink, counterbore and threads where needed on that same point.

Do one and let Fusion add the hard work with the pattern.

 

Might help...

 

 

 

0 Likes
Message 11 of 11

russellharris19
Contributor
Contributor

Thanks so much @davebYYPCU that all does really help. I'll work back through it and try and simplify it as per your advice points. I seem to create points unintentionally everywhere. I was pleased to get it done but it did look a mess. I'm doing some Udemy courses and they'll hopefully give me good direction as well. Overall really loving Fusion. Thanks again for the feedback. If it's okay I'll tag you in next time I have a question. 👍