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E112 L6 SUMMARY - Coggle Diagram

- - - - allowed to vary in only one direction
    - - the upper and lower limits of the dimension are specified
    - - allowed to vary in two directions from the specified dimension Both directions need not vary by the same amount
- - - - uses both chain and parallel dimensioning
    - - placing arrow heads between the extention lines may make the dimension very difficult to read. Arrowheads can be placed outside the extension lines instead.
    - - should only be used if the function of the object would not be affected by the accumulaiton of the tolerances
    - - to dimension multiple same dimensions by using N x Dimension
    - - simplifies parallel dimensions in order to reduce the space used on a drawing
    - - consists of several dimensions originating from a common reference surface
    - - circle is dimensioned by its diameter, arc is dimensioned by its radius and holes are located by their centerlines
    - - radial dimensions start with capital 'R'. (a) shows a radius dimensioned with the centre of the radius located on the drawing. (b) shows how to dimension radii which do not need their centres locating
    - - angle is marked with a curved dimension line and has the degree symbol
- - - - A cylindrical joint provides two degrees of freedom: one translational and one rotational. Components joined with a cylindrical joint always rotate around the same axis
    - - A pin slot joint also allows two degrees of freedom, but components can rotate around different axes
    - - . A slider joint has a single translational degree of freedom. It is used for components that slide along one another. Options are similar to revolute joint options, except that components slide along the selected axis rather than rotating around it
    - - A planar joint allows three degrees of freedom. It allows two directions of translation in a plane and a single rotational direction normal to that plane. It is useful for joining two components so they can rotate while sliding across the plane
    - - A revolute joint has a single rotational degree of freedom, much like a hinge. This joint can rotate around the standard X, Y, or Z axis, or around an edge in the model
    - - A ball joint has two degrees of rotational freedom: pitch and yaw. Pitch allows components to rotate around the Z axis. Yaw rotates components around the X axis
    - - A rigid joint fixes two components to one another. It provides no degrees of freedom