Dimension ZERO

[San_Escobar]

Hey Fellower.

I just tried all the way but seems that Fusion 360 doesn't allow to enter Zero Dimension.

Than I though would be great to have such option, other than use 0.0001mm as dimension. 🙂

[rishivadher]

Hi

where is the logic on a dimension been "null"

its like 2=1 by proving

if a=1 and b =1

a=b

a^2=ab

a^2-b^2=ab-b^2

(a+b)(a-b)=b(a-b)

a+b=b

2b=b

2=1

at maximinum geometricaly you can define the angle as 0

[Jon.Dean · Accepted solution]

Hi Aqhead,

I agree, it should work, does with most CAD packages.

Instead of using dimension = 0 you could use the constraint "Colinear".

I'm not sure why Fusion 360 does not allow the use of zero.

Jon.

[Silvio_Brasil]

I know this post is archaic but I dont understand why it is marked as RESOLVED!!! since I also like Dimension 0 and Fusion just lack about it...

I recently update my FUSION 360 and not improvement in this end, :S

[airesgabriel]

It would be great if it was possible with fusion just constraint something coincident, but in fact it's such an hard task. It's mandatory to create construction geometries and then use the colinear constraint 

[HughesTooling]

There is a workaround, add the dimension to the sketch as 1° then open the parameters manager and change it to zero.

Mark

[lichtzeichenanlage]

I'm new to CAD and I have an idea why this could be useful (e.g. for defining clearances) but I'm curious to know what's the "real" need behind this request. 

[HughesTooling]

For me one use is experimenting with the position of a feature, you might want to try a zero offset or even a negative one. These work as parameters already, if you're using several parameters to calculate a position there's always a chance you'll get zero or a minus number. The problem at he moment is the dimension input doesn't allow zero or negative input.

Mark

[lichtzeichenanlage]

@HughesTooling: Thx for the reply. That sounds useful. My workaround is to use the offset feature. That can take positive, zero and negative values. 

[HughesTooling]

@lichtzeichenanlage You're only thinking about one case and actually you can't go back and edit an offset and enter a negative number to swap the offset. I had a job a while ago that needed several sections to form a curved loft and dimensioned off projected points from previous section, some needed zero or negative offsets.

Another workaround is to toggle a dimension to Driven drag the point to the other side then toggle back to driving and enter the size.  Doesn't work for offset though!

Mark

[lichtzeichenanlage]

I'm not a professional or an expert. So for sure I don't think through all cases because I don't know them. And I'm / we're talking about workarounds and those are limited by definition. 

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@HughesToolingwrote:

@lichtzeichenanlage You're only thinking about one case and actually you can't go back and edit an offset and enter a negative number to swap the offset. ...

You can by using the parameter editor. 

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@HughesToolingwrote:

...I had a job a while ago that needed several sections to form a curved loft and dimensioned off projected points from previous section, some needed zero or negative offsets.

---

Sure, offsets are not working with points. You could draw a line through the point and offset the line, but that' an even worse workaround.

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@HughesToolingwrote:...

Another workaround is to toggle a dimension to Driven drag the point to the other side then toggle back to driving and enter the size.  Doesn't work for offset though!

Didn't know this one. Have to try it but doesn't sound clean either. 

[MichaelT_123 · Accepted solution]

Hi Fellows,

Traditionally, a dimension is considered to be a positive rational number, reflecting associated physical phenomena of acquiring it in a very physical world.

That said, applying such concept directly to the abstract world of CAD design only asks for troubles as evidence(s) show.

By extending the dimension's value to the whole domain of rational numbers, would allow a great simplification not only F360 internal algorithms but also night dreams? of many CADs aficionados.

Regards

MichaelT

[manoxFMZTG]

I work with Fusion and NX (Unigraphics). Many years ago (I think about 2010-12) NX add possibility to use negative value of dimenssions. And this is very usefull, for example to change side of line or point to base point.

When You must find right position of line (or other element) and change side for it: You must change dimension to driven, change side, change to dimesion to drive and change value. Very many changes... Easier is write "-".

Other way: in the sketch this is problem, but in extrude it's fine?

The same thing with zero value - sometimes You must change position of circle, and You have dimenion with some value. For change it to zero - You must delete dimension and add colinear. When You change conception - in opposite direction.

I see - post have 6 years. And now with configure table possibility use negative and null value could be more usefull than six years ago.

Best regards

MANok

[MichaelT_123]

Hi Mr ManoxFMZTG, 

The ZERO(s) issue is ambivalent ... not only in the Fusion world but also in the World outside.

Do we really need them? It is the question for mindfulness philosophers to contest. 

If you want to study it sedulously ... here are other posts about the subject:

https://forums.autodesk.com/t5/fusion-design-validate-document/constrains-direction-flipping-with-ch...

https://forums.autodesk.com/t5/fusion-design-validate-document/sketch-constraint-violated-when-chang...

https://forums.autodesk.com/t5/fusion-api-and-scripts/natural-numbers-voice/m-p/11522033

... and by the way ... do not treat them with ZERO margin of solemnity.

Regards

MichaelT

[busycleta]

Hi Michael

It is absolutely not ambivalent, here is why:

Imagine you are an audio engineer, you have many channels in the mix but the faders all the way down don't produce a zero-output signal.
-- instead this results in having an ever so slight signal of each channel on the master mix, even tough it should not be present at all.

In same way engineers want to have full control of there CAD Sketches as expected from any other CAD System, there is no possible benefit to be gained from restricting zero as a dimension value.

Greetings    

[MichaelT_123]

Hi Mr Busycleta,

I have an itchy feeling ... that you misunderstood my position about ... ZERO.

https://forums.autodesk.com/t5/fusion-api-and-scripts/natural-numbers-voice/m-p/11522033

Regards

MichaelT