An Attachment Level Design Process for Snap-Fit Applications

Abstract

The Attachment Level Methodology (ALM) defines a snap-fit as a system of interacting features. This leads to a fundamental paradigm for understanding and developing snap-fit attachments. Thus, the ALM is a design for assembly (DFA) enabler. The methodology was created to improve snap-fit development from concept through detailed design. The ALM supports profound understanding of snap-fits through its content and organization. It also supports a rational yet creative development process for snap-fit applications. Previous papers have described specific aspects of the ALM: (key requirements, elements and enhancements). This paper describes how they are used in a step-by-step snap-fit development process. In addition to ensuring that important interface criteria are considered in a logical manner, this process encourages creativity and improved spatial reasoning during snap-fit development. A review of attachment level terminology is provided. The snap-fit development process is then described. Feasibility of extending the process to other attachment methods is also noted.