sketch-sketch elements, dimensions, sketch definitions, relations, sketch complexity, starting a sketch, sketch entities, dimensions etc

A sketch is a 2d profile or cross sect of the 3d models drawn in the sketcher module . Creating a model usually begins with a sketch . Sketch entities are used to create features . The features are the basic blocks of a model. To create a 2D sketch use a plane or a planar face . In addition to 2D sketches , you. Can also create 3d sketches  that can be controlled by all three axes (X, Y &Zaxes).

Therr are various methods available for creating sketch. All sketches incluing the following elements

Sketch elements

Origin

 In many instances ,you can start to sketch at the origin ,which provides an anchor for the sketch.

Planes

Planes are the references widely used to place or refer a feature. You can sketch on planes with sketch entities such as the Line , Rectangle, Circle, etc Planes can be created in part or assembly environment.

Dimensions

Dimensions in sletch environment allows you to specify dimensions between entities such as lengths , Radious etc. When you change dimensions , the size and shape of the sketch entities will change . Depends on how you dimension the part , you can preserve the design intent. The software uses two types of dimensions: driving dimensions & driven dimensions.

Driving dimensions

you create driving dimensions with the dimensions tool. Drivit dimensions change the size of model when you edit their value s.

Driven dimensions

some dimensions associated with the model are driven or reference dimensions, for informational purposes, the value pf of driven dimensions changes

When you modify driving dimensions or relations in the model. You cannot modify the values of driven dimensions directly unless you convert them to driving dimensions.