This paper presents an analytical model for predicting the variation in the pitch distance between pilot holes stamped with a progressive die. The model is useful in designing diesets since it relates pitch variation to dieset parameters such as the quantity of pilot pins, clearance in the stripper plate bearings, clearance about the punch, and clearance about the pilot pins. The efficacy of the predictive model is demonstrated with a sensitivity study of design parameters in an exemplary dieset used to stamp electrical contacts. Predictions from the model match previously measured variation within about twenty-four percent.

Issue Section:
Technical Papers
Keywords:
microassembling, bending, machining
Topics:
Clearances (Engineering), Design, Errors, Pins (Engineering), Strips, Probability
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