Sketch Problem: Reference Existing Feature in new Dimension

[Amyoqzy]

The following Sketch is driven by the tool measurements (114mm):

Now I am about to add the locations for the screw holes. I would like to simply divide the outer dimension by 3.

Fusion 360 did all calculations for the outer dimension, but it seems I am unable to reference it.

So, how can I add the correct dimension for 1/3 of the outer length of this part?

I am aware I could do it ridiculous complicated like this:

- Manually referencing all existing dimensions and create a large calculation.

[TheCADWhisperer]

Can you File>Export your *.f3d file to your local drive and then Attach it here to a Reply?

Why is all of your geometry blue?

Where is the Origin?

Oops, I just read your problem description again.  I got hung up on the 114 dim.

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@Amyoqzy wrote:

 I would like to simply divide the outer dimension by 3.

So, how can I add the correct dimension for 1/3 of the outer length of this part?

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You will need a mature product like Autodesk Inventor Professional for this functionality.

In Inventor, you add the reference dimension and then make your dimension a function of the reference.

Not possible in current release of Fusion 360.

[Amyoqzy]

It would be unfortunate if there is no way to solve this in Fusion 360. Something like this is IMO basic CAD functionality.

If Fusion360 had no parametric system, I would totally understand I had to calculate dimensions manually. But if there is already a line with a calculated length, but I cannot reference this dimension... it is just ridiculous. 😄

[TheCADWhisperer]

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@Amyoqzy wrote:
... but I cannot reference this dimension... it is just ridiculous. 😄

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Yep, especially when this issue was solved longer ago than I can remember (I'm guessing more than 10 years ago).

Design Differently!  🤔

[jhackney1972]

As has been mentioned, Fusion 360 cannot pick up a reference dimension as a parameter.  You can design this problem a different way and I believe get what you want.  The only thing you did not specify is the segment between the end of your block and the tool measure, I am specifying that as a parameter, which can be changed.  I am also making the assumption you will be creating a solid from your sketch because I use that value in my parameter table.

[jhackney1972]

Forgot to attach the model used in the Screencast.

[g-andresen]

Hi,

just do it this way and create a point for your drilling if needed

günther

[Amyoqzy]

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@jhackney1972 wrote:

As has been mentioned, Fusion 360 cannot pick up a reference dimension as a parameter.  You can design this problem a different way and I believe get what you want.  The only thing you did not specify is the segment between the end of your block and the tool measure, I am specifying that as a parameter, which can be changed.  I am also making the assumption you will be creating a solid from your sketch because I use that value in my parameter table.

This is an interesting approach. Yet, for me it feels horribly wrong, to have to creatively work around something which just should be possible. 😄

[Amyoqzy]

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@g-andresen wrote:

Hi,

just do it this way and create a point for your drilling if needed

günther

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This is what I actually did in the end. But, I feel stupid if I have to repeat a calculation Fusion360 already did. It also adds a possible source of error to the design: If you already added the formula, but later add an additional feature, you have to update this formula - otherwise, the dimension will not match anymore.

Also, if you e.g. need 5 or mode dimensions based on this length - it is way simpler to write five times "ref / 5" instead of "(long formula with many references) / 5". 😄