CONSTRAINTS 52. You do your CONSTRAINING in Sketcher mode to create your part to exacting dimensions. This is the opposite of free-form creating we have.

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Presentation transcript:

CONSTRAINTS 52

You do your CONSTRAINING in Sketcher mode to create your part to exacting dimensions. This is the opposite of free-form creating we have done up to this point. 53

Pick the edge that you want to constrain, or give a definite dimension to, and then click CONSTRAIN from the toolbar. constrain 54

Another way to constrain a line on your part is to pick it and then click on CONSTRAIN IN A DIALOGUE BOX. You will have many different ways of constraining the area that will appear in the dialogue box. The ones that you can use will allow you to pick them. Constrain in… Picked line Picked point 55

The Constraint Definition box allows you to chose one or more constraints and apply it or them to the line that you have chosen to constrain. Notice that in the definition box only the constraints that you can apply will be highlighted. 56

Now that we have clicked on DISTANCE, the distance between the two areas we have chosen will be defined. distance 57

You can apply more than one parameter picked in the Constraint Definition box. Notice here that we have picked VERTICALITY as well as distance, and that it has been applied to the vertical line. verticality 58

Another very handy thing that you will find useful from the constraint dialogue box is CONCENTRICITY. If you draw two circles, one inside the other, and had intended them to be concentric but they are not, you can make them concentric this way… 59

Choose the two circles (by holding the control button) and then click on the defined constraints icon from the toolbar. 60

Click on concentricity and the two circles will do exactly that …become concentric. A small symbol will occur at the centre of the circles, this is the concentricity symbol. Concentricity symbol 61

Again, you can pick more than one thing. This time we have chosen FIX as well as concentricity. Fix is the icon you click if you wish these two circles to remain concentric forever. From now on, these two circles will act as one and the anchor symbol will show up there. Fix symbol 62

Now you are ready to go to 3D mode and dress this sketch as you wish. Notice that all is green…this is CATIA’s way of telling you that you are ready to move on. 63