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Freecad simple fixed bridge - Contenido educativo

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Subido el 28 de octubre de 2023 por Juan Carlos A.

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Hello, in this video tutorial I'm going to use the building blocks and this FreeCAD file to design a simple bridge 00:00:00
This simple bridge will consist of two towers and a platform linking them 00:00:12
I'm going to use this cube block here, namely the BB2 as the building block for the towers 00:00:21
and some other platform blocks for the platform 00:00:34
So I start by selecting the block and then I'm going to duplicate it 00:00:39
Once I got it selected I go to the main menu, here at Pieza, and use Crear Copia Simple 00:00:46
Now I got a new block, I'm going to rename it, so I right click on it and use Renumbrar 00:00:54
and I'm calling it First Floor 00:01:02
This renaming is kind of optional, I'm doing that so I can find it more easily at a later time 00:01:06
Now I'm going to move it and I'm going to move it also at this direction, which is the negative Y direction 00:01:16
so I put it apart from the other blocks 00:01:27
So I'm going to Placement, click on the button with the three dots and this window will open 00:01:31
Now, if you're doing this in a somehow narrower screen, you might find that this window is like that 00:01:38
This somehow happens when you're using the school's laptop 00:01:52
Now then you cannot see properly the numbers inside these boxes 00:01:57
So the first thing you should be doing is click and drag wider this window so you can actually see and read the whole numbers 00:02:02
Now, as I said, I'm going to move this alongside the negative Y axis 00:02:14
so I can click here and you can see it moving, but then this goes very slowly 00:02:20
and I would be doing this faster if I just type the numbers into the box 00:02:28
What numbers? You have to bear in mind that the separation between connectors is 50mm along any direction 00:02:38
and that is precisely the same separation between blocks at every direction too 00:02:48
So you should be using multiples of 50, so you move it in increments of 50mm 00:02:55
as that will make much easier to place the blocks 00:03:04
So we'll start with something like minus 200 and see where it goes 00:03:10
and, ok, I reckon this is not far enough, I want this to be more separated 00:03:18
and so I'm going to use like 250, something like that 00:03:26
Now, once I've translated this block, I have to click on accept type 00:03:35
because if I don't do so, then the changes will not remain and I will lose the motion 00:03:45
and the block will stay at its original place 00:03:55
If I were to do several motions in a row, I can just change other numbers here 00:04:01
and sometimes you will like to click Aplicar Cambios Incrementales a la Posición 00:04:13
and that will restart the coordinates and place them at 0, for a later time maybe 00:04:23
Now I click on Aceptar and I got this block 00:04:37
Now I can just duplicate this one by selecting it, going to Pieza, Crear Copia Simple 00:04:42
and now I have this that I can rename to Second Floor 00:04:51
and it's placed on top of the first floor 00:05:01
Now if I want to move it upwards, I just click on Placement and change the vertical coordinate 00:05:05
If I do it by 50, then I have it like that 00:05:12
So let's have a closer look at this 00:05:17
I click on Aceptar to keep the changes 00:05:20
and then, what do I have here? 00:05:23
What I do have here is 1, 2, 3 connectors in a row vertically 00:05:27
Well, indeed, at this central point I have two connectors, one on top of each other 00:05:35
When you are actually building this using the 3D printed connectors and the wooden blocks 00:05:42
you will be using just three of them 00:05:50
Now we place it one on top of the other so it becomes easier for us to build the tower 00:05:53
and this is just to have a visually simple guide for you to build them in real life 00:06:00
Now I can duplicate the second floor, same way as before, Crear Copia Simple 00:06:12
and then I will have a third floor here 00:06:19
Now that again sits on top of the second floor 00:06:29
and I would like to move it upwards another 50 00:06:36
so if it is at 50, I will type here 100 00:06:41
so I move it up just 50 mm 00:06:46
and now I got a three floor tower like this 00:06:54
Well, I am going to make a second tower which is going to be a copy of this one 00:07:02
I can use the same procedure to build it floor by floor 00:07:11
but it becomes easier if I link the three floors together and just duplicate the result 00:07:18
We can join two objects by using this tool here that will make a fusion of them 00:07:29
First of all we have to select them 00:07:40
If we are going to group objects we have to do it two by two, we cannot group three at a time 00:07:43
So let's start with the first and second floor 00:07:54
How do you select two objects? 00:07:58
You select the first one, then hold down the shift key and click on the second one 00:08:02
Now you got the first and second floor selected 00:08:08
Now, as I already told you, you could be using this boolean operations here 00:08:12
This is the addition, that is the abstraction, that is useful to make holes, this is the intersection 00:08:20
In this case, this fashion or addition one would put them together into just one object 00:08:29
But we are not going to use this, why? 00:08:38
Because then the program will recalculate all the vertex and faces of the object to merge them into a new one 00:08:43
And that's a lot of processor intensive task 00:08:56
And then it will take a long time and that's not so useful 00:09:02
So there's a simplest and fastest way to do that, which is go into pieza and compound 00:09:08
So we create un cuerpo compuesto 00:09:19
That way the two objects will be linked but without the need of recalculating and doing all the math 00:09:23
And that's faster, like this 00:09:33
Now we got this compound and we got the two floors together 00:09:37
Now I'm going to add the third floor 00:09:44
So I select the compound, two floors and hold down the shift key and click on third floor 00:09:47
And go back to pieza and compound, crear cuerpo compuesto 00:09:56
Now I got this and this compound object includes the three floors 00:10:03
I'm going to rename it as tower1 00:10:10
And now that I got the three floors together I can duplicate it the same as I did before with pieza crear copia simple 00:10:14
Now I'm going to leave this name here because it has automatically come after tower1 00:10:34
So I got tower2, which is on top of tower1 00:10:43
And I'm going to move it 00:10:47
Where? 00:10:49
Well, I would like to move it along the x, the horizontal axis 00:10:51
And the positive direction 00:10:58
Please don't notice that for a compound object the coordinates are reset at zero 00:11:03
So if we use multiple of 50, let's say 300 and have a look 00:11:12
Well, that's... I guess that's good enough 00:11:24
Ok, maybe a little... no, that's good 00:11:29
So, accept that 00:11:34
Ok, now I have this two towers placed apart 300 mm 00:11:36
And now for the platform 00:11:51
For the platform I would like to use this flat blocks here 00:11:55
But then the link with the tower should include some of the 3D connectors 00:12:02
So I'm going to start using this block 00:12:12
Now, that will make a fixed platform bridge 00:12:17
At the later video tutorial I will show you how to include some axes that will allow the platform to rotate 00:12:23
And so we get a movable platform bridge 00:12:39
Ok, so let's find out which platform is this 00:12:44
So I click on platform here 00:12:48
Platform 1, that's the flat 1 00:12:54
Platform 2, that's not it 00:12:58
Platform 3, that's it 00:13:01
So I just duplicate it 00:13:03
Create simple copy 00:13:06
That's the one 00:13:09
But I'm not going to rename it right now because I think I can find it easily, it's at the bottom of the list 00:13:11
I'm going to move it 00:13:21
Yeah 00:13:25
So in which direction? 00:13:26
So I have to move it along the negative Y-axis 00:13:29
And then along the vertical axis 00:13:34
And then I will have to move it again along the negative X-horizontal axis 00:13:37
So first, along the negative Y-axis 00:13:46
Let's try, I just don't remember how far apart is this from there 00:13:54
But I can check it quite easily 00:14:00
Let's say minus 100, sorry, not the X-axis, first the Y-axis 00:14:03
Minus 100, not far enough 00:14:10
Let's check minus 150, that's it 00:14:15
And now vertically I don't know precisely how far it has to go because it's 50, 100 and 150 00:14:20
So 150 and it's up there 00:14:28
And now I have to move it so these connectors go into the place of those ones 00:14:33
And that would be just 50 to the left along the negative X-axis 00:14:40
So let's say minus 50 00:14:47
And I got it there, and that's it 00:14:50
So now, that's how it looks 00:14:54
And I'm going to continue using the platform 1 00:15:00
Duplicating it and placing it there 00:15:12
I duplicate it 00:15:16
And now I'm moving it 00:15:21
How far? Well, first of all, this is minus 100 00:15:26
Let's try with minus 200 00:15:32
And then minus 300 00:15:36
And then, well, looks like minus 350 00:15:39
There it is 00:15:45
And now I'm moving it to the left 00:15:47
So if it is 100, let's try with minus 100 00:15:52
Ok, precisely 00:15:57
And now upwards 00:15:59
Just 150 00:16:02
The tag, and now I got it there 00:16:05
Quite in the same way as with the towers 00:16:13
Even though we have used two platform building blocks here 00:16:18
And these connectors are duplicated 00:16:25
When you are building it with real life 3D printed connectors 00:16:28
You will be using just one here and another there 00:16:36
Ok, now we got it here 00:16:41
Four connector building blocks 00:16:44
We can duplicate it 00:16:47
And just move it to the right along the X-axis 00:16:52
So if it is minus 100, it would be minus 50 00:16:58
Like that 00:17:04
Accept that 00:17:06
And then again we duplicate it 00:17:08
And move it another 50 00:17:12
So if it is minus 50, it's going to be just here 00:17:15
Good 00:17:22
So now we got the platform nearly finished 00:17:23
We just have to use another block 00:17:27
Like this 00:17:30
At this point 00:17:32
So we can duplicate the first one 00:17:34
We use this one 00:17:39
And move it to the right 00:17:45
And then see what happens 00:17:48
So let's say if it is at minus 150, let's try 50 00:17:50
Then 150 00:17:59
And that's it 00:18:02
Ok, look 00:18:04
Now it's properly placed, but it is backwards 00:18:06
See, these 3D connectors should be here 00:18:10
And the flat connectors should be there 00:18:13
So we have to flip it to the other side 00:18:16
How can we do so? 00:18:20
That's a rotation 00:18:21
That's a rotation along the vertical axis 00:18:23
Now, well, rotations are a little bit tricky 00:18:29
Because the pieces will rotate either around a global central axis 00:18:35
That goes through the center of coordinates 00:18:47
And please take into account that we are at these coordinates 00:18:52
150, minus 150, 150 00:18:58
And then the vertical axis will go through the 0, 0, 0 00:19:03
So let's see what happens if we try a rotation 00:19:10
We are aiming for a 180 rotation 00:19:14
And see what happens 00:19:19
Now, where is the piece? 00:19:22
Now we can click the first icon so everything fits into the window 00:19:25
See where it is 00:19:31
Why is it there? 00:19:33
Because it has rotated from an axis that was more or less like there 00:19:34
So it rotated around this axis going along this circle 00:19:39
So this is not useful 00:19:46
That's not good 00:19:49
We can still leave it there and translate it and place it there 00:19:52
But there should be an easier way 00:19:57
So we are going back to the 0 angle 00:20:00
So we got it here 00:20:05
And let's try a different approach 00:20:07
In addition to the axis of rotation with angle 00:20:12
We got the Euler's angles 00:20:20
Let's see what are those 00:20:22
Those are not alongside the coordinate axes 00:20:26
They are called the deviation, tonal and flat 00:20:30
Let's see what do they do 00:20:33
If I increase the angle in this video 00:20:37
This is what's going to happen 00:20:41
It's going to rotate quite like before 00:20:44
But not around the same center 00:20:49
Let's use a 180 and see where it is 00:20:52
More or less quite the same 00:20:57
So, that's not useful either 00:21:01
We should be trying something else 00:21:05
What can we do? 00:21:08
We can use the center of masses 00:21:10
What's the meaning of that? 00:21:14
That means the origin of coordinates will be placed at the center of masses of this block 00:21:16
Which is somehow inside the block 00:21:26
So, let's try again with the axis on the 180 degrees 00:21:32
Not good either, right? 00:21:43
So, now let's try with the angle of this video 00:21:47
Not good 00:21:56
So what's missing here? 00:21:57
Well, there's another checkbox 00:22:01
We can try this one too 00:22:05
Aplicar cambios incrementales 00:22:08
Now, see 00:22:10
We got immediately the zero coordinates 00:22:13
They are reset to zero 00:22:20
Now, I'm going to move it back to where it was before 00:22:24
Not there 00:22:34
Like, let's say, 0.015 00:22:35
No, it's just 0.015 00:22:38
There it is 00:22:40
And now we'll try to rotate it again 00:22:42
Now it's rotating the closure 00:22:47
Well, it's still not fitting, but we just have to do a short translation here 00:22:52
Let's see what happens if we use the vertical axis instead 00:22:58
The same 00:23:09
So, we can use the vertical axis 00:23:10
Now, the center of mass is here 00:23:15
And, as we are using incremental changes, those are relative to the previous position and not to the global position 00:23:21
Now, summing up 00:23:30
You have to click Usar centro de masas and you have to click Aplicar cambios incrementales a la posición 00:23:34
And now you rotate 180 alongside the vertical axis and get this one 00:23:42
Now, you want this to be there 00:23:49
Why is it not fitting? 00:23:52
Because the center of mass is not placed exactly at the center 00:23:54
So, we have to move this along the horizontal direction 00:24:01
How much? 00:24:07
Look, this is 200 00:24:08
200 00:24:10
Now, I'm going to move it one by one 00:24:11
2, 3, 4, 5, 6, 7, 8, 9 00:24:14
And I will zoom and make sure these circles are properly separated 00:24:19
Like there and there and there 00:24:29
So, look, it's 16 mm 00:24:34
That's what you have to move 00:24:36
Let's check moving it a little longer 00:24:39
See? It's gone past 00:24:43
So, we go back to 16 and they fit 00:24:46
Now, accept that 00:24:50
Well, and that's how you get a very simple bridge with two towers and a fixed platform on top of it 00:24:53
Ok, thank you 00:25:04
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Idioma/s:
en
Autor/es:
Juan Carlos Alonso de Mena
Subido por:
Juan Carlos A.
Licencia:
Reconocimiento - No comercial - Compartir igual
Visualizaciones:
50
Fecha:
28 de octubre de 2023 - 10:55
Visibilidad:
Público
Centro:
IES ALPEDRETE
Duración:
25′ 06″
Relación de aspecto:
16:10 El estándar usado por los portátiles de 15,4" y algunos otros, es ancho como el 16:9.
Resolución:
1920x1200 píxeles
Tamaño:
113.29 MBytes

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