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Folding table
ProApe
Member Posts: 196 ✭✭
Hello,
I have drawn the elements (boards) on one side of a folding table, but the last board displays a lot of constraints, the width of 60 mm is not accepted and the sketch cannot be resolved, even though I am doing nothing else but drawing a final rectangle.
Why is that?
Without the last board (rectangle):
https://cad.onshape.com/documents/f46893a8a14783a155638e77/w/7a46865500cd32d0a4412de8/e/10ed14f7fcd5ea1a78ceb377?renderMode=0& uiState=68c94156eeb4ef7504acadb1
I had removed the last rectangle that Onshape had stumbled over for the link above, and then wanted to redraw it to show the problem, but then it was accepted. Strange, since I had done exactly the same thing as before.
Another question: how can I join the individual boards into a single part? Boolean didn't work on my first attempt, where I had drawn all the boards contiguously in Part Studio 1, which is probably not the right method.
I then drew a queer board and a longitudinal board in separate Part Studios to join them together in the assembly:
https://cad.onshape.com/documents/f46893a8a14783a155638e77/w/7a46865500cd32d0a4412de8/e/0f27d485e8546aafeee29592?renderMode=0& uiState=68c94c12651893865770afef
Kind regards
ProApe
Comments
If your just going to boolean it all together in the end… why not just make a rectangular block and cut a slot in it and then pattern the slot.
https://cad.onshape.com/documents/ea06c2047dea1f116aec5869/w/7ef41e0583a68d6a879d1a48/e/07aedec632f0d985cbe7766d
Ok, but I want to construct it and therefore need all elements.
How can I align the boards in the assembly studio leaving a defined gap between them?
Do you know how to use the different mate types in assembly studio? Have you done this course yet? Intro to Assembly Design
I have already assembled various designs in the assembly using different connectors, but here I want to create a gap between two boards, and I have no idea how to do that.
Sorry, without wanting to complain -the Onshape tutorials are generally very well made and very helpful- but as I mentioned earlier, in another thread, I often have problems with American speakers of video tutorials, unlike English ones, because often little attention is paid by the speaker to clear and distinct pronunciation (e.g. not ‘port’ but ‘part’), and the speaker usually speaks as they would in everyday life, I understand some of them very poorly, acoustically speaking, and end up switching off.
And this tutorial, for example
https://learn.onshape.com/learn/course/introduction-to-assembly-design/assembly-interface/positioning-parts?page=1
is, what more is, spoken far too quickly. Okay, you can reduce the speed.
One could expect the speaker to make an effort to pronounce words clearly and without any slang when reading and speaking the text of a tutorial (incidentally, I absolutely reject any accusations of sexism, but I find that female speakers speak less clearly than male speakers).
Unfortunately, these videos are not available in other languages (?).
If you use mate connectors and want a gap between parts, look into the "offset" options found in every mate connector's edit box. If you have copies of identical parts and want gaps between these, use the pattern feature and make the distance larger than the width of the boards:
https://cad.onshape.com/documents/2bb3c1fca231235c5617d527/w/2d967152bd510609a078a7bf/e/f7a5b4cce551149a09a1ca9d?renderMode=0&uiState=68ca78b9a58df618d08b22d7
Always fix the first part in the assembly FIRST THING. Use instances instead of creating the same part time and again. The model will become much simpler, then, and much easier to handle. In the above sample, we have but two parts, two mates and one pattern - done! :0)
I found the offset and continued with that, but the linear pattern method is of course easier and faster. It also has the advantage that the interval between the boards is calculated automatically.
Another problem I encountered: the central part does not move, so I fixed it. The left part that is adjacent to the central part can be folded down, and I don't know where to attach the revolute mate connector (?). I wanted to copy the left part to the right to be symmetric to the first one, but even though the boards are connected to each other with mate connectors, they can be moved separately. How is that possible? What am I doing wrong?
https://cad.onshape.com/documents/f46893a8a14783a155638e77/w/7a46865500cd32d0a4412de8/e/0f27d485e8546aafeee29592?renderMode=0&uiState=68cb12e02d0e5ef69a0096f1
I see you did not use patterns in your assembly, and no subassemblies, but instaed made lots of identical new parts again. Before you go on: Fix that. It is never going to work out this way.
Create subassemblies of everything that stays together rigid and make sure the subassemblies (Folding Top, Center top, Center Scaffold, Folding leg, …) are all fully constrained internally, before you go on. Else, parts will start moving on their own in higher level assemblies. Only then (when nothing moves any more in the subassemblies) assemble the subassemblies in a top assembly.
Ich vermute Du bist in Deutschland. Darf ich fragen wo?
Im Lötschental CH-VS bin ich.
I completed the design in my own complicated way. Although there are many red connections in the assembly, which surely means problematic, it worked.
I assume a subassembly is an assembly like any other, except that subassemblies converge in a main assembly?
At first, I didn't understand why the boards of the two plate parts could be moved individually even though they are connected with mate connectors (and I still don't understand it, actually). I was able to solve this problem by grouping them so that the mate connectors only served to put them in the right place, but they were only firmly connected by grouping them!
And I started drawing a folding chair earlier and am currently still stumbling over the curve of the two back parts.
https://cad.onshape.com/documents/f46893a8a14783a155638e77/w/7a46865500cd32d0a4412de8/e/0f27d485e8546aafeee29592?renderMode=0&uiState=68cc1e0b8f7c6528c1003d68
You're right. Assemblies can be nested within each other. I have restructured your design a little bit:
Note there are no "parts" on the top level any more and very few mates. The folting part of tze top is identical left and right, as well as the support frame is. Everything is re-used, there are no duplicates. Now, If you'd not name every part "Part1" there would be even less confusion inside the subassemblies and in the Bill of Materials (Right side).
You may want to look into the file and compare.
https://cad.onshape.com/documents/710e8c0b3df2dfd3f990c2e1/w/f8cf95a98c2f8a82f5a683ef/e/96d83b93cc3d64cf42c9ff34?bomType=flattened&renderMode=0&rightPanel=BOMPanel&uiState=68cc85ec2a556b9550e0454f