Repeatable crash when changing parameter

[Anonymous]

My Fusion 360 hangs (keeps loading/recalculating for ages) as soon as I try to change any parameter (e.g. number of teeth) on this model of a GT2 timing belt pulley that I started to build up. The moment I tab or click away from the changes parameter, the UI freezes up completely.

I can totally understand that recalculating the model from the ground up could take a short while. But I'm on pretty decent hardware and I've waited for 10 minutes without any kind of progress, so it seems to me that it gets stuck in some kind of infinite loop.

I'm at a loss, can anyone replicate this behavior on their end?

[g-andresen · Accepted solution]

Hi,

1. sketch only one tooth and extrude it
2. duplicate the tooth with the circular pattern in solid mode (Option > Feature > Identical)

A basic rule of fusion is that patterns are always based on features, bodies... and not on sketch elements.

günther

[Anonymous]

Thanks a bunch for that workaround, this works great!

Am I correct in saying that my initial approach (drawing the whole gear and patterning all teeth in the sketch) should theoretically also work? Even if that approach is somehow very difficult to implement/recalculate, one would still expect Fusion to not crash/hang, right?

[g-andresen]

Hi,

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@Anonymous wrote:

Thanks a bunch for that workaround, this works great!

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That´s no workaround!

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Try this for understanding:
Sketch an arrangement for, say, 10 instances.

Then you extrude the 10 instances.
So in the timeline they are behind the sketch.

Then you change the quantity in the sketch to 15.
Result: you have to extrude the five additional instances.
You can do the same by sketching and extruding one instance and then creating the pattern.
What will happen?

günther

[davebYYPCU]

Not a crash without a CER number, 

Sketch Patterns are performance hogs, 

changing tooth count in a sketch, means you need more patience, Fusion is still working, to replace / create all the new items and constraints.  Not checked the file, as I don’t have that much patience.

Let us know how long it actually takes, your way.

[TheCADWhisperer]

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@Anonymous wrote:

But I'm on pretty decent hardware and I've waited for 10 minutes without any kind of progress...

In the Attached file - change NumTeeth to 150.

What do you observe.

Change NumTeeth to 300.

What do you observe?

Change NumTeeth from 300 to 6.

What do you observe?

[Anonymous]

I'm not _that_ patient either 😄 but point taken! I'm used to Fusion staying reasonably responsive and giving me a pretty good indication that it's still busy doing something useful. In this instance, the UI completely freezes up and Windows ends up calling the application unresponsive and offering to close it, hence my conclusion that something out of the ordinary might be going on.

Having said that, if this is how the application handles long-running (re)calculations, I do feel that Autodesk could improve UX by offering some indication of progress and/or giving the user a chance to cancel/terminate the (extremely) long-running calculations rather than becoming completely unresponsive and needing to force-quit the application.

[Anonymous]

I observe that it works like a charm - consider me schooled 😄 Thanks!

[TheCADWhisperer]

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@Anonymous wrote:

I observe that it works like a charm - consider me schooled 😄 Thanks!

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Last semester I had a student that if I asked him a question like this - he would have put it on 3,000 or 30,000.

After four years I could anticipate that I just said the wrong thing (what do you observe).  Covid or no Covid - he graduated.  Had to get him out of my hair while I still had some left.

How about helping out >>this user<<?