The First Snap-Fit Handbok Bonenberger
Paul R.Bonenberger
The First Snap-Fit Handbook
Creating and ManagingAttachmentsforPlasticsParts
3rd Edition
The Author:
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ForewordtoThirdEdition
Globalization resulted in the off-shoring of American manufacturing to low labor ratecountries. In order to pete or just survive the manufacturers of plastic products were forced to improve quality and reduce cost.
All aspects of the manufacturing process were scrutinized. Most of the plastics moldingprocesses were or could be automated. The only manufacturing operations that were still labor intense were tool making and assembly.
fucturabfity or DFM. This technology enpassed all aspects of the manufacturing This realization resulted in a new technology that came to be called Design for Manuprocess. However the easlest and quickest savings were realized by improving assembly.the savings to be had by designing for manufacturability (or assembly). Conference Almost overnight the trade magazines were full of case studies and articles extollingspeakers and seminar teachers begin explaining the advantages of replacing fastenerswith molded-in attachment features.
In the midst of that frenzy the University of Wisconsin recruited me to join Paul Bonen-berger's multispeaker Snap-Fts and Product Design seminar. I rememher telling the recruiter that I was not an expert on snap-fits. He replied they wanted me to talk abouthow to improve the design of the two plastic parts required for a snap-fit. Paul and theother speakers would cover the details of designing the actual snap-fit structures.
The first seminar was held in 1998. By that time I had been designing plastic parts forover forty years and I had designed my share of snap-fits. I thought I already knew what1 needed to know. In spite of that I sat in on Paul's lecture. It quickly bee evident that Paul and the other snap-fit speaker knew far more than I did about the design anddevelopment of snap-fits. They explained concepts and details that had never occurred to me. How could this be? I had far more experience than either of them In designingand developing plastic products. The answer to that question was that snap-fits are justone of the hundreds and hundreds of details that I and other designers have to take into account in the design and development of a new plastic product. Most designers willhave only an occasional need to design a snap-fit and cannot devote a lot of time to that one detail.
Paul Bonenberger on the other hand worked at General Motors. That glant panybut was missioned to do something about the foo many loose fasteners in GM generates an endless stream of potential snap-fit applications. Paul was not only there
products. That was the beginning of his analysis of various types of snap-fits. GM pro-vided the opportunity to try different methodologles and learn how they performed over time. Being in the right place at the right time allowed Paul to perfect the engineeringthat determines how snap-fits function.
concept that provides a proven method of managing the design and development of a This work also led to Paul's development of the Attachment Level Construct (ALC)successful snap-fit application The ALC concept is the basis for this book.
Most designers have only an occasional need for a snap-fi. If the resulting structure does not function as required the part design and the mold are modified to overethe assembly's falure. They do not design enough snap-fits to develop a true under-for us. His The Firsr Snap-Fit Handbook contains what he has learned by concentrating standing of how they function and how they fail. Fortunately Paul has done that workon snap-fit design and development work. All of which has been fine-tuned by his teaching programs and tempered by his many years of hands-on experience.
If you alreadly own an assembly bok or two you will he surprised by the The Frsr Snap-Fir Handbook. It does not make the usual attempt to include all of the many assembly technlques and all of the different metal fasteners. Like the name says this bookconcentrates on only snap-fits. If you have thls book you possess the best of what Paul Bonenberger has learned about snap-fits. 1 have no hesitation in remending thethird edition of this book to anyone interested in optimizing the design of snap-fit plasticassemblles.
Libertyville Illinois2016
Glenn L. Bealf
