When designing automated assembly systems using a various fixtures, careful considerations for shaft/bore fits along with locating pin/hole shapes and configurations are needed.

Principles of locating feature designs

	*	Adequately chamfer the pins holes to facilitate smooth pin entry.
	*	Two constraint points cannot simultaneously exist per one insertion action.
	*	Extraction action must also be considered when designing.

[Fig.1] shows typical configurations of locating pins and locating holes. Subjects related to the locating parts are as follows.

	1.	Required position locating accuracy.
	2.	Assembler/apparatus accuracy. (Degree of work difficulty or ease, etc.. Machine accuracy.)
	3.	Assembled parts accuracy. (Case of high accuracy parts, or variable accuracy parts, etc.）
	4.	Workability of parts such as contacting surface length, etc. (Relationship between produceability and accuracy, etc)

Locating pins / Example of concentricity error and pin shapes" name="image" width="527" height="240" />

Locating pin/hole design in [Fig.1] is to be proceeded with the following.

Locating pins

Locating holes