Coupling Design Process: Coupling Selection


The second step in the coupling design process is the selection of the coupling type. This selection process is most easily done by comparing the critical design parameters with the capabilites of the basic coupling types using some form of comparison table. For example, a Pugh chart or weighted decision chart could be used. The selection process is difficult due to the adaptability of each coupling type to the design requirements. General trends in the abilities of the different coupling types are shown in the table below.

To see additional information about each type of coupling, click on the coupling type below.

Coupling Type Contact Type Repeatability Stiffness/Load Capacity Industrially Ideal
Basic Pin Joint Surface Poor (~5µm) High Fair
Elastic Averaging Surface Fair (~1µm) High Good
Planar Kinematic Mixed Good High Good
Quasi-Kinematic Line Good (~0.5µm) Medium to High Good
Kinematic Point Excellent (~0.01µm) Varies (Usually Low) Poor

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