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This is tutorial 119 in drawing for Katia. In this tutorial we are going to show you how to deal with
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tolerances for your drawings. As you know the tolerance are a daily issue in
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manufacturing and it is a very important issue and should be shown in the drawings.
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For example we have a small thread here. We can provide tolerance to be for example minus
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0.01 millimeter not to be positive point 0.01. So that tolerance that
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tolerance will be positive that might be bigger than the thread. The cylinder which is going to fit
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inside that thread cylinder. So and also many other issues in manufacturing. This is the
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thread example. So let's start to make some tolerance for that cylinder thread. Do that, go to insert
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and you go to the dimensioning tolerancing geometrical tolerance and then click where you want to
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show you tolerance. For example we want to do that circular cylinder thread. Then click anywhere
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and here you can choose the type of the tolerance. You have circularity and you have many others
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surface and you have this velocity. So we can choose this velocity and we can write the
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tolerance to be minus 0.01. And if you go to the reference it's not activated because in
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this case you don't need any reference and then you click OK. So when manufacturing the
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operator will know that the tolerance should be in the minus. And also we can try another type
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insert the dimensioning and then we go to the tolerancing geometrical tolerance and let's
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this time choose this circle. And let's choose the type to be circle and we can make it 0.012.
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Press OK. So you specify the tolerance to be in the range 20 to 012. And also we can
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make surface tolerance. For example we need this surface to be a little bit rough. We show you
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how to insert the roughness sample here and also you can add a tolerance for these roughness.
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You can go to the insert dimensioning tolerance and geometrical tolerance and you click that area
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and choose the surface. You can make tolerance 0.012. You can write difference with some sample
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P. Anything that you are agreeing with the sample types of the meaning of the letter. And
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press OK. So you have your referencing. As I noticed the tolerance reference were activated
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in case of the surface tolerance. And you saw if you want to edit the tolerance you just
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double click on it and you are able to change.
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