44 THE DISTRIBUTOR’S LINK Anthony Di Maio Anthony E. Di Maio attended Wentworth Institute and Northeastern University. In 1962 he started working with Blind Fasteners as Vice-President of Engineering & Manufacturing for two blind rivet manufacturers. He has been Chairman of the Technical Committee of the Industrial Fasteners Institute (IFI) and is still involved in the writing of IFI specifications. In 1991, he started ADM Engineering and is working with Fastener Manufacturers developing new fasteners and special machinery. He can be reached at ADM Engineering, 6 Hermon Ave., Haverhill, MA 01832; phone and fax 978-521-0277; e-mail: tdimaio@verizon.net. PROPER PREPARATION OF A BLIND RIVET APPLICATION The proper preparation of a blind rivet application must be met to have the proper results regarding a secure assembly of components of the application. Aside from the proper blind rivet in the application, the following two subjects are very important to having a good blind rivet setting and a good safe and tight assembly. One is hole diameter and the other Is work thickness. Even if you are using the proper diameter and alloy blind rivet, hole size and work thickness Is very Important. Hole Size The hole diameter must be within the range recommended by the rivet manufacturer. The problem is never with the hole in the work piece being too small, because if the hole Is too small, the blind rivet will not enter the hole. The problem is when recommendation. Oversized hole diameters in work pieces to be blind riveted is one of the most popular reason why a user has blind rivet problems. Oversized hole diameters in work pieces will cause the following defects to a riveted joint. When a blind rivet is placed in a oversized hole and set. The following action occurs. The mandrel head will enter the body of the blind rivet and expand the rivet barrel. Because the blind rivet is in an oversized hole, the mandrel head expands the rivet barrel against the inner wall of the oversized hole. The mandrel head does not feel resistance because the mandrel head is not stopped by the oversized hole and the mandrel head continues to travel the entire length of the barrel and stops at the flange or head of the bllnd rivet. the hole diameter is larger than the manufacturers CONTRIBUTOR ARTICLE CONTINUED ON PAGE 116
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