Assembly 3 - modify/edit or delete/replace constraint? (solved)

[bambuko]

I have an assembly with a constraint that caused it to be assembled not as intended.
Can I modify/edit the constraint and elements to change the assembly design?
or...
is the best way to delete offending constraint and elements and create it again?

I know I can do the latter, but would it be preferable to edit rather than re-create?

Plus deleting constraint doesn't delete elements used originally - I am ending up in confusing mess (my fault I guess)

modify_constraint.jpg (123.11 KiB) Viewed 1730 times

correct_assy.jpg (261.31 KiB) Viewed 1730 times

modify_element.jpg (255.28 KiB) Viewed 1730 times

[jpg87]

Can I modify/edit the constraint and elements to change the assembly design?

Hello !
It is possible to replace the constraint element El @ As_crosshead_pin of crosshead_pin by the constraint element El2 @ As_crosshead_pin by dragging and dropping the last one onto that of the connection to be modified.

replace constraint.jpg (140.81 KiB) Viewed 1704 times

If the necessary constraint element has been forgotten, it is possible to add it. For it :
- activate the smallest sub-assembly containing the component by double clicking on its name in the tree (the ones I noted As _...) ;
- click on the geometric entity which must become a new constraint element available for this component ;
- in the tree, drag and drop from the highlighted function to the "Elements" group.

add constraint.jpg (150.27 KiB) Viewed 1704 times

Advice: act at the level of the constraint elements of the basic assembly containing only the part and not at the level of the group of elements of the sub-assembly (Elements018) : the update will be done automatically.

[bambuko]

...It is possible to replace the constraint element ... by dragging and dropping...

Thank you again

I have spent almost all day looking for a menu option to perform this kind of operation and it never ocurred to me to try "dragging and dropping".
Should have known that RealThunder would do things his own way

That's great news and very good exercise to practice my understanding of elements.
Thank you for detailed explanation and advice.

I must admit that I am a bit concerned about keeping order to all these elements, particularly in a more complicated model.
I can already see me having multiple copies of the same elements and loosing track of what is where and what is what

After all the design you have been helping me with, is rather simplified compared to the full model (I tried to keep it simple to make learning easier), and even these is complicated enough...

[jpg87]

...

PS:
Several modifications must be added:
First of all remove the constraint "PlaneAlignmentV_AxleBox-CrossHead (whith offset)" that I had used to position the piston mechanism.

supp constraint.jpg (203.79 KiB) Viewed 1671 times

Then change the constraint type for AxialAlignment_ConnRod-Piston to PlaneAlignment_ConnRod-Piston (rename the constraint after change of type).

change constraint.jpg (200.37 KiB) Viewed 1671 times

Finally replace the constraint element El2 @ sub-Ass_piston by the element El @ As_crosshead_pin.

replace constraint2.jpg (151.08 KiB) Viewed 1671 times

Recalculate the assembly.

[bambuko]

...

change constraint.jpg (200.37 KiB) Viewed 1667 times

That is a particularly useful piece of advice
Until now if I got the wrong constraint I would delete it and try again.
Now I know you can simply change it as well

I hope all this great stuff finds it's way to your grand Assembly 3 tutorial

I love the way Assembly 3 works

[jpg87]

I hope all this great stuff finds it's way to your grand Assembly 3 tutorial

That was my intention. There it's done :
http://help-freecad-jpg87.fr/0270_ass_FAQ.php

I also want to take my basic example to upgrade it to version 0.11 of Asm 3.

I love the way Assembly 3 works

Me too: I find it full of tips.

[bambuko]

...There it's done :
http://help-freecad-jpg87.fr/0270_ass_FAQ.php

Excellent! and how fast
I am much slower... and distracted easily

[LHC]

...There it's done :
http://help-freecad-jpg87.fr/0270_ass_FAQ.php

Excellent! and how fast
I am much slower... and distracted easily

I just went through this as well - thanks very much. I've picked up a few more tips as a result, and will have to review a couple more times before a few things stick in my head.
Cheers

[jpg87]

...

...

Thank you for your support.
I have started updating the web pages for my basic example and will try to find time to update the affected videos.