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Dimension - Contenido educativo

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Subido el 24 de abril de 2019 por Isabel L.

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Well, after expressing the object in the European system, we should express the dimension of these objects. 00:00:01
Dimension is very important in the technical field because everything needs to be done with a specific size. 00:00:15
and size is important so express our dimension in the in the in the draw is the only way to 00:00:30
to give enough information uh other people to do this to to make this object uh in this 00:00:45
presentation we will review some important concepts such as scales, 00:00:55
dimension lines, length units and dimension standardization. So let's move 00:01:06
on to the first point which is scales. Obviously when we draw something we use 00:01:12
proportionality. We use the Thales theorem and the dimensions of our draw are 00:01:21
proportional to the dimension of the real object. But we have to express this 00:01:33
and to express the proportionality we usually use scales. Scales may be natural 00:01:42
scales when the draw and the object have the same dimensions and we 00:01:52
express like this, with E and the dimensions in the draw and dimensions in 00:02:00
the real object. But not only do we have the natural scale but we also have 00:02:15
other types of scales, such as the reduction scales, which are the most 00:02:26
important in technology. In this particular case, our draw is 00:02:33
smaller than the real object, so we have to express the proportionality using 00:02:42
this expression of scales. And finally we can also have scales of 00:02:50
extension that just only used for biological, for example, to express 00:03:01
bacteria or also in electronic or so on when in these fields in which the 00:03:11
objects are very small and we need to to extend them in order to give the 00:03:22
details of the objects. In our draw we have to express the dimensions of the 00:03:31
real object. For this we use dimension lines. The elements of dimension lines 00:03:42
depends obviously what you want to dimension but in the simplest in the 00:03:50
easiest way in case you have a extension line it also calls auxiliary extension 00:03:56
line and you draw a dimension line which is parallel to the dimension you want to dimension 00:04:07
and this dimension line is ending in arrowhead this dimension line the thickness of this 00:04:20
dimension line is 0.2 millimeters, which means that is a thin line. In the 00:04:34
middle of this thin line, of this dimension line, you should express the 00:04:47
real dimension of the object in millimeters without decimal and without 00:04:55
the symbol of millimeters if you are drawing very big or very small object 00:05:01
you also change millimeters and put in which units are in the dimension line 00:05:10
have to express has to write has to express a the the unit that you have 00:05:23
used to express dimension and in this is late we review the units of length it is 00:05:32
the basic unit is meter obviously but what happened very often is that the 00:05:45
objects are or too big or too small so we usually need to use a difference 00:05:57
units or of lengths so you put profiles in order to express the value of the 00:06:11
of the unit. The most important are kilo, which is 1000, hecto, which is 100, deca, which is 10, 00:06:30
and when it's smaller, when it's small, we use deci, centi, and milli. But in this slide, 00:06:45
you can see other possible for units of length. Finally, we use some standardization 00:07:00
to express our dimensions line. For example, if the object has symmetry, you 00:07:15
put the dimension line taking this into consideration. The dimension line 00:07:25
never cross so be careful in this with this and finally the the cube the cube 00:07:34
lines the cube dimensions if the cube dimension is bigger than 180 degrees you 00:07:48
use the diameter for dimension this kind of objects. On the other hand 00:07:59
if it's smaller you use the radius and sometimes you can put the symbols to 00:08:14
express that is a diameter diameter of a radio and it is all for today but what is very important is 00:08:25
that you you do the exercise because as you have said you have already said in in technology and 00:08:38
and also in draw is very important that you train a lot. 00:08:50
So the only way to learn all these contents is training. 00:08:57
And it's the reason why you have to do the exercise. 00:09:05
Autor/es:
Isabel Lafuente
Subido por:
Isabel L.
Licencia:
Reconocimiento - No comercial
Visualizaciones:
71
Fecha:
24 de abril de 2019 - 20:08
Visibilidad:
Público
Centro:
IES JAIME FERRAN
Duración:
09′ 10″
Relación de aspecto:
1.78:1
Resolución:
1920x1080 píxeles
Tamaño:
94.17 MBytes

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