Dimensional errors in 2025.1

[steve_lindley]

Hi,

I wonder if anyone else has experienced this...

Myself and a colleague have both independently experienced incorrect display of dimensions - a fundamental error for Inventor! Of course, we're both experienced designers and have checked our work and asked for second opinions, but can't explain this any other way.

We're both using Inventor Professional 2025.1.1 Build: 241

Please see screenshots of an instance I've seen this morning. I couldn't understand why two components didn't line up. I used a reference dimension in one component to size the second. To understand why they didn't line up, I turned on visibility of the sketches in the parts. You can clearly see both 630mm dimensions.

In the component part with the reference dimension, if I try to place a second dimension, the preview is 668mm, so it's clear this is the incorrect instance.

I'm curious to see what Autodesk make of this.

[kacper.suchomski]

Hi

There is a high probability that you are using adaptivity. If I am right, one dimension describes the value before the update, the other - after. In such situations, you need to take care of updating the model.

cc @Frederick_Law 

[steve_lindley]

@kacper.suchomski Thanks for the suggestion and for taking the time to reply, but I can guarantee we're not using adaptivity. Personally speaking, I prefer not to use that functionality at all.

[Frederick_Law]

Probably model failed to update.

Reboot computer.  Sometime IV crashed but keep running in background.

Could be file corruption.

Put the parts in another assembly and see if it works.

Any iLogic?

I'm using 2023 so can't open your files but attach them so other can check.

[johnsonshiue]

Hi! I have seen this behavior before. It is probably a corrupted driven dimension. Or somehow there is an implicit cyclic relationship between the parameters. Please share the file here. I would like to understand the behavior better.

Many thanks!

[steve_lindley]

@johnsonshiue Please see files attached. 

I basically couldn't wait, so I deleted the original dimension and placed a new one and it has been fine since.

[steve_lindley]

To all that have taken an interest in this, I still believe there is something not quite right in this version of Inventor. I have a slightly different example. Not dimensions in a sketch, but something I've not seen before in 13 years of using Inventor either. It was a simple measuring task. The first time I measured between two items in an assembly, I noticed it wasn't a round number as I was expecting, (502.49994mm) so I spent a couple of minutes checking my parts and constraints to see where the problem lay. I couldn't find an issue, so I went back to measure again and this time got 502.50000mm as it should have been. [I like to see more decimal places than is strictly necessary - just a personal preference].

Not trusting what I'd seen I measured again and got the 502.49994mm again. The thing I didn't immediately notice was that Inventor is measuring a height difference between parallel planes for some unknown reason. Since when has it done that? I asked a colleague to come look and he was as puzzled as me.

Why is it doing that?

[steve_lindley]

I'd like to add to my last message as I believe there is a very slight angular misalignment because I've got mismatches all over the place. So, I'm going to eat my words and apologise. The original post still stands, but this measurement issue is human error I think.