Orientation or localization of parts is generally performed based on external features and often this is a prelude to complicated assembly operations in which several parts must be mated at precise features. There are a number of parts whose internal features are of primary importance and whose external features do not lend themselves for automation. In this paper, we study the effect of two key parameters: stack height and drive-wheel profile, on the performance of a methodology we proposed to orient and stack parts with internal features. Their effect on the process are modeled both analytically and experimentally. Experimental results are presented which demonstrate the effectiveness of these methods and their sensitivity to these parameters.
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