Not possible to change a dimention

[Anonymous]

For some strange reason i'm not able to change the dimention (3180) to the right of the first sketch.

I have looked at the constraints but it seems to me that i should be able to change this dimention.

ipt attatched

[mdavis22569]

It lets me, but it gives you other issues with your following sketches:

You need to clean up the other sketches and contraint them:

[Anonymous]

I added the needed constraints but it still doesn't let me change the dimention. i guess a reboot could help?

[jhackney1972 · Accepted solution]

I have no trouble changing the dimension but it messes up the center location of the top arc.  You have the side of the sketch constrained by midpoint to the origin.  Remove this sketch constraint, add a vertical or horiz. constraint to the top arc center and the origin, leaving the 488.01 dimension and you will have no issues changing your side dimension.

[mdavis22569 · Accepted solution]

I would do that, but I would also clean up the model ... 

Otherwise, you're just opening a can of worms ... one after another ... 

[Anonymous]

Thanks for the help. Did it a bit diffrently but got it now where the mistake was.

[Anonymous]

Thanks for the tip didn't even know i let that part unfinnished. Sometimes i'm not sure where to place the remaining constraints so i use the automatic placing although i rather know what it should be.

[Anonymous]

How do you make a video like yours?

[mdavis22569]

He used Screencast:

https://knowledge.autodesk.com/community/screencast

it's part of Inventor. Check your Add-in manager for 2019 and make sure it's not blocked.

[anoor]

I would do what @jhackney1972 suggested and I would also clean up sketch 4 by deleting the two boxed dimensions below and adding a symmetrical constraint instead. 

[jhackney1972]

I am sure he is using the Inventor "Auto Dimension" command.  No one would come up with those dimensions on their own! 

[anoor]

I agree. It makes it easier though in the long run if you use the constraints instead of a bunch of dimensions, but to each his own I guess.

[mdavis22569]

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@anoor wrote:
I agree. It makes it easier though in the long run if you use the constraints instead of a bunch of dimensions, but to each his own I guess.

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Depends on what you're modeling ... I'd had for him to think he can just constrain it more. I can't count how many times I've seen people FIX constrain everything vs giving a dimension to it. 

[anoor]

Oh I cringe when I see a sketch that's full of locked constraints and only has 1 or 2 dimensions. I usually end up redrawing the whole thing because it's faster. It's like you said, it depends on what you're modeling.