How can I go back and change an offset operation in a sketch?

How can I go back and change an offset operation in a sketch?

sprior913
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How can I go back and change an offset operation in a sketch?

sprior913
Advocate
Advocate

Today I took a picture of some wrenches, attached that as a canvas, then traced them in a sketch.  In this sketch I applied an offset to the wrench outlines, then extruded them and created a 3D printed storage tray.  Unfortunately the holder ended up too tight so now I need to go back and increase that offset about 0.5mm and hopefully let that change propogate through the rest of the operations.  Unfortunately since there seems to be no design history withing a sketch I can't figure out how to do this.  Can anyone give me a clue?

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Message 2 of 8

TrippyLighting
Consultant
Consultant

Use the dimension tool and dimension only one part segment of the offet from the original template. Rememer that dimension 😉 because ...

 

then I'd actually delete the entire offset and repeat it because since the update last night the enire offset is parametric and dimensioned automatically, so if you have to change it agin, you'll just double-click that dimension and change it to your needs 


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Message 3 of 8

sprior913
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Advocate

The first thing I tried to do was to delete the original offsets and recreate them, but at first I was having trouble getting the extrude operation that generated bodies from these sketches to let me reselect it.  Now I'm past the reselect, but I've got other operations on the resulting bodies that are red in the timeline and won't seem to let me reselect the right body and continue.  I've uploaded a f3d archive of this project to dropbox (it was too big to post here) here.  The body named "4mm" is the wrench I deleted the original offset on and added the new style offset, but the later move operation on that body won't let me select it.  If I can get this to work then I'll do the same with all the other wrench bodies.

 

Deleting the original offset and recreating it invalidated the extrude done on that part and I'm having trouble repairing that so I can continue.  Can someone show me how to fix this?

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Message 4 of 8

TrippyLighting
Consultant
Consultant

Yes, when you delete the original offset the followong operations loose their reference. 

 

I would start by deleting all the move operations and whatever else turns up yellow or red. Then I'd proceed with re-creating the offsets using the new offset tool.

Then start moving things back into place and combine things. 10-15 minutes of work max.

 

In general though, please be aware of the difference between bodies and components. Using just bodies is fine for this object, but as you progress to more compicated designs that difference will become important.


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Message 5 of 8

sprior913
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For this simple model I could delete all the rest of my work and start over, but I was under the impression that this shouldn't be nececessary so I'd like to know how to do this for when the design is more complicated.  Right now it feels like one or more of:

 

- The code doesn't work as it should

- The documentation/error messages doen't explain how to recover from this as they should

- I am completely misunderstanding either of the above

 

Fixing either of the first two would make Fusion 360 a better product, fixing just the third would be better for just me.

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Message 6 of 8

jeff_strater
Community Manager
Community Manager

@sprior913,

 

You have fallen into a bit of an ufortunate timing window here.  Your original sketch offsets were created at a time (before the update this past Sat 1/23) when sketch offset was not associative at all.  That is, offset was really just a curve creation technique.  No relationship back to the original curves were created, and you could not modify the offset by modifying the source curves.  The Fusion team took this approach for reasons of expediency.  It seemed better to have some method of creating offsets, even if they were unassociated, than to have none at all.  Then, we started implementing associative offset, which is what just got released.  We believe that the current version works quite well, and will address your original question.

 

However, because your offsets were created before this capability was present, there is no real way to go back and make them associative.  You will have to do as @TrippyLighting suggests, and go re-create the offsets for those that you want to be associative.  And yes, this will mean in some cases that you will have to edit any features which consumed the offsets, then repair any errors that are side effects of those, etc.

 

So, you have a choice.  If you don't need to modify your old offsets, I'd recommend leaving them as they are.  Only re-create any offsets that you want to be associative.

 

I hope this helps clarify the situation, even if it doesn't help your specific design issues.

 

Jeff Strater (Fusion development)

 


Jeff Strater
Engineering Director
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Message 7 of 8

TrippyLighting
Consultant
Consultant

You had two choices:

 

1. You leave the old non-associative offsets in your design, but this will be a hassle if any edits need to be made.

2. You delete the old offsets and editing offsets will be much easier going forward. This also deleted some of the references to geometry created after the reset.

 

I chose to advise you on #2 because IMHO it was the better path forward.

 

You did not provide a screenshot nor did you share your design. I could have warned you of what was going to happen and provided more targeted advise had I known how your model was structured. Details matter!

 

I agree on your point #3 that the error messages are not particularly self explanatory and there needs to be better documentation, perhaps a Fusion 360 troubeshooting guide. 

 


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Message 8 of 8

sprior913
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Advocate

Thanks both.

 

All of the original offsets I used do need to be changed because I 3D printed the object and the wrenches didn't fit.

 

I now understand the bit of bad timing so I will have to delete and recreate the offsets with the new functionality.

 

So my question has really changed from "how can I go back and change an offset" to "how do I edit any features

which consumed the offsets, then repair any errors that are side effects of those".  I have now posted a link to the project and

there are red and yellow items in the timeline that I can't seem to fix with edit feature, for example a move operation on the old

body which I would like to change to apply to the body that replaces the original, but is otherwise identical.

 

And sorry @TrippyLighting, while the nature of your suggestion was helpful, my response to it seems to have made

you feel like I thought it wasn't - that was not the case.  I'm trying to learn the best praactices of the tool (and provide feedback

on bugs and improvements), so the fastest workaround to finish this particular project is actually a secondary goal at the moment.

 

Kind of a "give a man a fish and you feed him for a day, teach him how to use the CAD tools properly and he can design his own **** fish..."