6. LINKAGE SYNTHESIS

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The large number of possible ways to satisfy design criteria make it hard for us to select a single useful mechanism.

The design techniques outlined below can help narrow down, or select a specific mechanism.

To do the design work we typically begin with some functional specifications for a path of motion. These specifications typically include one or more of the following,

- rotational motions (i.e. shaft)

- differing advance/return times

- small stop/dwell times

- straight line segments in path

- specific velocities along path

- a curved path

Some points of interest about the selection of linkages in design,

- linkages can be used in place of cams to,

reduce forces

eliminate loading spring

simplify manufacture and tolerance problems

- the space required for these linkages may be larger than cams

- in many cases ratios are specified. After we get these we will design the weakest member to be mechanically adequate, and then design the other parts.