Assembly 3 - using Shape binder with Link objects (solved)

[bambuko]

I want to further model bodies in parts of Assembly 3.
I want to use shapebinder to create new sketch, but the part/body I want to shapebind is a link, rather than original.
Any attempts to select the link, creates Shape binder in the original part, not in the link.

I have managed to by-pass this limitation by using sub Shape binder,
but sub Shape binder (unlike Shape binder) has it's own placement and it can be moved,
so it can cause problems, as described here:
https://github.com/realthunder/FreeCAD_ ... issues/595

So, my question is - how do I? (or can I?) use Shapebinder in Assembly 3 with link?

[jpg87]

but sub Shape binder (unlike Shape binder) has it's own placement and it can be moved,
so it can cause problems, as described here:
https://github.com/realthunder/FreeCAD_ ... issues/595

I tried to figure out what your problem is but I can't do it: why are you trying to move the sub shape binder? there is a priori no reason to move it, unless you want to force the machining to be offset.

TestShapeBinder.jpg (48.86 KiB) Viewed 1963 times

[bambuko]

...I tried to figure out what your problem is but I can't do it: why are you trying to move the sub shape binder? there is a priori no reason to move it...

I guess it is the way my weird brain works
I will try to explain:
1. with sub shape binder the situation is similar (at least to me) to creating model using not fully constrained sketch - it looks OK, but it is vulnerable, not stable and easy to corrupt the model (whether by user stupidity or accident)
2. whether there is a reason to move it or not, if it can be moved, it might (it will) be moved, easily corrupting the model.
3. freezing, sub shape binder doesn't prevent it from being moved.

whereas, shapebinder (as opposed to sub shape binder) stays put...

Thank you for your model - it is interesting how you can achieve the same result doing things slightly differently

[jpg87]

...

I think I noticed that you often use the word "transform" to test for displacements: does that mean you are using the "transform" from the context menu?

transformContext.jpg (80.07 KiB) Viewed 1911 times

This tool seems to move everything unconditionally. I rarely use it.
I rather use to test in an assembly the tool of Realthunder "axial move".

AxialMoveAsm3.jpg (69.75 KiB) Viewed 1911 times

If the elements are constrained, it will only move them if the Ctrl key is pressed simultaneously, and when validating, the constraints resume their rights if the automatic solver is activated.

If you haven't yet compared the 2, give it a try and tell me what you think.

I had prepared a screenshot to answer your question ... which you removed!

BindMode.jpg (68.07 KiB) Viewed 1911 times

I also tried on my website a comparison between ShapeBinder and SubShapeBinder which is not convincing :
http://help-freecad-jpg87.fr/01506_pi_astucesPdN.php

[bambuko]

Thank you!

...I think I noticed that you often use the word "transform" to test for displacements: does that mean you are using the "transform" from the context menu?...

I use all of them to test robustness of my model, because (as realthunder says) - "Locked" constraint doesn't prevent you from using other mover tools).
I believe I have found a way to "anchor" base/reference which totally locks it prevents moving it, but that's for another topic

...This tool seems to move everything unconditionally. I rarely use it...

I know and that's the danger of this tool (and one is not prevented from using it )

...I rather use to test in an assembly the tool of Realthunder "axial move"...

Yes, this one is indeed better for assemblies.

...If you haven't yet compared the 2, give it a try and tell me what you think...

I think "transform" from the context menu, should be disabled for assemblies?

I had prepared a screenshot to answer your question ... which you removed!

I am sorry
I shouldn't have submitted my reply before being totally sure of what I am trying to say.
Plus, I am so used to you replying very late in the evening that I didn't think I would cause this...
Yes, I know about bind modes - my question really was:
if you detach, there is no option to re-attach? (only, as shown on your screenshot - synchronised, frozen and detached)

...I also tried on my website a comparison between ShapeBinder and SubShapeBinder which is not convincing :
http://help-freecad-jpg87.fr/01506_pi_astucesPdN.php

Yes, I am spending lot of time trying to expand my knowledge of sub shape binders and shape binders.
sub shape binder seems more powerful and useful, but in some instances shape binder would be most appriopriate, but...
it cannot be used with "Links"

[adrianinsaval]

what advantage does the shapebinder has over the subshapebinder? IMO shapebinder should be deprecated in favor of subshapebinder. If the only advantage is that it cannont be moved, can't you solve that by using an expression to set the subshapebinder placement to always be (0, 0, 0)?

[bambuko]

...can't you solve that by using an expression to set the subshapebinder placement to always be (0, 0, 0)?

What expression are you suggesting?
I have tried without success, but that could be just me?

[jpg87]

I am spending lot of time trying to expand my knowledge of sub shape binders and shape binders.

I had also tried an example of a completed design since assembly :

http://help-freecad-jpg87.fr/025c5_ass_ ... eption.php


But I rarely have comments (positive or negative) !

[bambuko]

...But I rarely have comments (positive or negative) !

I didn't get that far yet ...
You will defintely get comments/questions from me (as usual )

One thing is for sure - I like your videos better than realthunder's .gif in his wiki.
With your videos, you can pause, return and easily watch bits of it again
(I only wish there was a facility to watch it 50% speed as well - I am slow )

None of it is possible (at least as far as I know) with .gif, so the illustrations in Assembly 3 wiki are hard work (at least for me)

[bambuko]

and... a final post in this thread.

After a lot of help both from jpg87 (here in this thread) and realthunder (on Github: https://github.com/realthunder/FreeCAD_ ... issues/595)
I finally got my head round the idea that Transform command from subcontext menu is good for setting offset or changing placement,
but for moving part/sub-assembly in Assembly 3, one needs to use the Assembly mover.

Do NOT use the Transform command for moving assemblies, because Assembly mover is aware of assembly hierarchies and will modify the the Placement property of the correct assembly/part object in the hierarchy, while the Transform command only works for the selected object.

Thank you both for your patience