Stock is displayed a bit larger than it actually is?

[FrodoLoggins]

I'm assuming this is just visual. The part is Ø.5", the stock's fixed/relative size cylinder/tube always displays a bit larger than .5" though:

[seth.madore]

Welcome to 2016, let me show you around!

Yeah, it's been like that since the beginning, there are tickets open. Although, in the cases I've found, it's been dealing with rectangular stock 🤔

[brekmiller]

Seth, could you take a closer look at this?  You are thinking about CAM-42522, which was about simulation showing extra stock for "relative sized box".  CAM-42522 was fixed and the fix just came out in the September release.  Did that break something with cylindrical stock?

https://forums.autodesk.com/t5/fusion-360-manufacture/simulation-bug-relative-size-w-no-additional-s...

[seth.madore]

I've taken another look at this, and my response above was incorrect. It's actually just a tessalation issue between how we render the stock and the model. We don't render perfect circles, and zooming in really close will reveal the "inaccuracy". These images were taken at different points on the model, with fixed zoom settings:

 

 

[FrodoLoggins]

I'm assuming the rendering affects the appearance of the placement of the work offset gizmo as well?

[seth.madore]

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@FrodoLoggins wrote:

I'm assuming the rendering affects the appearance of the placement of the work offset gizmo as well?

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No, it shouldn't. I'd be interested to see if you can prove otherwise (bearing in mind toolpath tolerance can work in 3 dimensions)

[FrodoLoggins]

If you look at the video in my OP the position of the work offset gizmo follows the stock (as expected as I've elected to drive it off a stock point not model point).

So right here is the WCS as displayed by Fusion:

But the stock being larger is just a visual issue.

So I'm assuming the WCS is actually here:

[seth.madore]

Nope, WCS is in correct location, we can prove that out with some line sketches:

 

It's just a render accuracy when zoomed in close.

 

 

[FrodoLoggins]

Ok so just to confirm:

You're saying the WCS location is in the correct spot despite the video showing the WCS in the incorrect spot and that this is all just a rendering issue. Correct? 

[seth.madore]

Your video is not showing that the WCS is located incorrectly. It's showing that the stock and model are not rendered very well when zoomed in extremely close, giving the illusion of a misplaced WCS.

Your WCS is in the correct location as far as I can tell. Do toolpaths prove otherwise?

[FrodoLoggins]

Ok so if the diameter of the model is .5" and the diameter of the stock is .5" and I've elected to drive my WCS off a stock point then the WCS should look like this:

Not this:

The gap is more evident when choosing a stock body that is also Ø.5". In this case my stock body is the same as the body [component actually] selected for the model body:

IDK if my posted code would be any different. Maybe it's just a visual error and the code is the same, maybe it's not just visual but the issue is too small to make a difference with a post that only posts 4 decimal places to the right of the period.

[programming2C78B]

Are you positive both axis are concentric? If your model is .5, stock set to 0.5, and there's a yellow gap on just one side then its not concentric, or you have some sort of flat thats changing where center is. Would need to see the model.

during simulate, use this and see what offset you are getting

[FrodoLoggins]

Hi the OG model was attached to my OP.

I believe they are concentric:

EDIT: There is extra stock displayed on top and bottom:

[programming2C78B]

I found it. In my opinion it's just tessellation. Keep in mind how far in your zooming on a part that's only 1/2" in dia! 

[FrodoLoggins]

Of course. Something that small won't ever matter for the stuff we do. But IDK maybe next time it's off a thou. I care less about a visualization error and more about a WCS not being where it should be.

[programming2C78B]

I would program a spot drill from Model Top, then regen with your WCS on model and stock. See if the actual value changes - I'd doubt it. 

[FrodoLoggins]

Toolpath sims only display 4 digits to the right of the decimal place, correct?