Rectangular Pattern bug

[etfrench]

Fusion 360 appears to be unable to create this simple pattern on one leg of the model.

Workaround was to create a new sketch on the face of the successful leg and use Extrude|Cut to create the pattern on the bad leg.

[josef.kucera]

Hi @etfrench

maybe it's not a bug, it's a precision issue because when I increase General precision to max. and measure the distance of the cutting face, copy the value, put it as a spacing into pattern it works as expected...

Hope it helps.

Regards,

Josef

[etfrench]

"Precision issue" sounds like a bug to me   The component was created with one Extrude operation and the faces on each leg were created with one Extrude|Cut operation which would indicate the legs should be identical.  The rectangular pattern should not be failing on one leg and not the other.

By the way, increasing the precision level excaserbates the number entry bug where the full number isn't displayed.  How hard is it to change the size of an entry field based on the precision level?

[josef.kucera]

It's not obvious how the cut/extrude was created from the timeline since these are basic features created in direct modeling but what is obvious is that when I increase precision and measure the distance of cut/extrude it isn't 1.495in but little bit more so that's the reason why pattern doesn't work as expected when value 1.495. is used for spacing.

But if you have whole workflow how did you get to the point where the extrude isn't perfectly 1.495in please share it with us...

Regards,

Josef

[daniel_lyall]

@etfrench @josef.kucera It's a bug (not what you think is) in @etfrench copy of fusion. I can not make it do what @etfrench shows at all.

I tried 3 different ways to do it, with the timeline set to the end with the timeline straight after the body with the timeline off.

@etfrench more than likely a reboot will clear it. 

A lot of the bugs that pop up a reboot clears them, if it does not then it's a bug, When I have bugs pop up I do a reboot before trying to capture it most times it's gone after the reboot.

[etfrench]

@daniel_lyall Interestingly enough, the operation succeeded the first time after a reboot and failed on every attempt after that.  If a reboot causes an issue to no longer repro, then there is a more insidious bug as that implies Fusion 360 is storing invalid or corrupt data locally.

@josef.kucera The pattern was created by drawing a .375" diameter circle on a line offset .75" from the bottom of the component.  A line tangent to the circle was drawn at a pleasing angle to the bottom line. A fillet of .1875 radius was applied between the tangent line and the bottom line.  The tangent line and fillet were mirrored to the opposite side of the circle.  The measuring tool was used to get the distance between the end points of the fillets.  I use 5 decimal place precision setting.  I would use the max precision setting if the entry fields for numbers were left justified at a minimum or resized to show the full number.

[daniel_lyall]

Yep it is, I think it's part of the connection problem Stupid bugs don't seem to happen if I have fusion of line.

[Noah_Katz]

This type of thing would happen in my previous CAD s/w and was indeed a precision/roundoff problem.

It looks like the dimensions of the cut from the first leg are slightly less than the size of the second.

If you used All for the depth of cut, switching to Distance and making sure the cut goes beyond both sides may fix it.

Looks like you might also have to extend the sketch above the top surface.

Not sure if all that is any less work than your workaround.

[daniel_lyall]

It's a bug with his copy of fusion, there's nothing wrong with what he did, If someone can get a fail and someone else can not make it fail at all, it's there computer and fusion not fusion by itself.

If he pulled fusion offline it may have gone away as well. It worked after a reboot then failed again, that shows where it is but not what is the problem.

[josef.kucera]

Hi @jeff_strater could you please help @etfrench with his problem?

[daniel_lyall]

@josef.kucera jeff is on holiday

[josef.kucera]

Hi @daniel_lyall

thanks for the info 🙂

Hi @NicolasXu, please could you take a look what the issue of @etfrench really means?

Regards,

Josef

[NicolasXu]

Hi @etfrench

Thanks for reporting this problem and sharing the details. I think it should not behave in this way, and have reported it to the development team for investigation (ID is FUS-31327 for reference).

Another workaround is, using Split Body to separate the two legs -> Pattern -> Combine the two legs.

Best Regards,