WRONG model size after extrude

[helsork]

Hello folks,

I have problem with model sizes after extrude model from sketch.

Example: I draw 878.8 x 484.2mm rectangle. Then extrude 0.6mm and when I measure the dimension in (all decimals) I got 878.7999999999999545 x 484.1999999999999318 mm. Why is this happening? How to solve this? 

Thanks for answers.

Error

[TheCADWhisperer]

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

[helsork]

Thanks for answer.

Yes, I can. Each time I draw a new rectangle and extrud I got different dimensions after the decimal point, But still, it’s never an integer.

[helsork]

The biggest problem in preparing a part for folding is because all the walls come in different thicknesses and fusion 360 not understand. 

[mango.freund]

you're right, it doesn't work that way, when everyone knows that the answer to all questions is 42.
Just next to it is over even if it is a few trillionths of a millimeter. greetings mango
I'm curious about the answers.

[TheCADWhisperer]

---

@helsork wrote:

The biggest problem in preparing a part for folding is because all the walls come in different thicknesses and fusion 360 not understand. 

---

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

Why not model in finished form and let Fusion generate the Flat Pattern for you?

What are you attempting to model?

More information is needed.

[helsork]

Here’s the problem that fusion 360 doesn’t make a mat. because the dimensions run through the errors and don’t unbend the mat. Anyway, I don't understand why it doesn't allow you to make models with integers. I understand that this is not a big mistake, but I would dont want such errors when drawing a device. And extruding the model should not change the dimensions by itself 😞

[helsork]

Attach another model. All surfaces of different thicknesses... I tried to put a sketch on the surface and then hide the model for new extrude out the new part (2mm) but I still get 2,00xxxxx or 1,99xxxxx

[mango.freund]

Please take a look at your preferences and use - as is usually the case in the technical area - no more than 3 digits after the comma.

[TheCADWhisperer]

This part is modeled incorrectly.

Where is your history?

Since there is no history - I will have to remodel the part from scratch.

When I remodel it - it will work fine.

Are you sure about this?

[TheCADWhisperer]

@helsork 

Where did you go?

I finished it as fast as I could go.

[TheCADWhisperer]

@helsork 

What happened?