72 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. SETTING BLIND RIVETS Blind rivet setting tools both power and hand tools are easy to operate and very efficient. To maintain proper setting of blind rivets, your blind rivet setting tool must be in good working order. A power setting tool, whether manual, pneumatic, pneumatic hydraulic or electric, should set a blind rivet within its grip range, in one stroke. If your setting tool does not set the blind rivet in one stroke, your setting tool is not functioning correctly. All blind rivet setting tools use pulling jaws to pull the mandrel to set a blind rivet. Some setting tools use two-piece jaws and others use three-piece jaws, but in either case the theory is the same. The jaws are housed in a jaw case along with a jaw pusher and a compression spring. Figure No. 1 illustrates a setting tool ready to receive the mandrel of a blind rivet. Notice how the jaws open in a parallel axis. This opening action is achieved by the jaws (two or three piece) being forced against the CONTRIBUTOR ARTICLE nosepiece as the jaw case is being powered towards the nosepiece. As the jaws contact the nosepiece, the jaw case continues to move, forcing the jaws against the jaw pusher and the compression spring. The jaws are against the nosepiece at one end and the spring loaded jaw pusher at the other end, compressing on the jaws. This separates the jaws in a parallel plain enough to accept the blind rivet mandrel. The travel distance of the jaw case is constant. It can only travel the forward stroke distance of the power tool. Therefore to open the jaws to accept the mandrel of a 1/4-inch blind rivet, the 1/4-inch nosepiece has to have a longer threaded section than the nosepiece for the mandrel of a 1/8 blind rivet. So when you are changing nosepieces for different diameter blind rivets, you are also changing the amount of distance the pulling jaws open. When the setting tool starts its blind rivet setting stroke, the jaws leave the nosepiece and the jaws are being pushed onto the diameter of the mandrel. If the teeth of the jaws are filled with flakes of plating, chips of aluminum, steel, etc. from blind rivets set previously; the teeth of the jaws cannot grip the surface of the mandrel to set the blind rivet. This is when the pulling jaws will slip along the mandrel before gripping the mandrel and setting the blind rivet. Disassemble the tool according to the manufacture’s instructions manual, clean the teeth of the jaws with a hand wire brush, oil the outer surfaces of the jaws and re-assemble the tool. If the jaws are still slipping, replace them with a new set. CONTINUED ON PAGE 164
THE DISTRIBUTOR’S LINK 73 UNICORP ELECTRONIC HARDWARE 291 Cleveland St, Orange, New Jersey 07050 TEL 1-800-526-1389 FAX 973 674-3803 EMAIL sales@unicorpinc.com WEB www.unicorpinc.com BUSINESS FOCUS ARTICLE UNICORP EXPANDS NAS/MS INVENTORY Unicorp Electronic Hardware is proud to announce that we have expanded our NAS/MS inventory to become the largest stocking manufacturer in the nation. We currently offer our entire line of electronic hardware, fasteners, and handles in National Aerospace Standards (NAS) and military specifications. Since 1971, Unicorp has been a socially and environmentally responsible leading manufacturer of American standard and metric precision electronic hardware, fasteners and handles. We pride ourselves on our dedication to customer satisfaction and our commitment to support the needs of our distributors. Unicorp offers top quality products, fast delivery, excellent pricing, technical assistance, and manufacturer to customer print specifications. We are known throughout the industry as the “oddball king” because we offer the widest variety of diameters, lengths, and finishes in our numerous product lines. The Unicorp product lines consist of: Standoffs & Spacers, Male to Female Standoffs, Male to Male Standoffs, Jackscrews, Swage Standoffs, Captive Screws and Retainers, Insulating Shoulder & Flat Washers, NAS/ MS Hardware, Shoulder Screws, Plastic Circuit Board Supports, Nylon Fasteners, Dowel Pins, Thumbscrews & Thumbnuts, Self-Clinching Fasteners, Cable Ties, and 24 styles of Handles, Fixed, Folding, Rack- Panel & Ferrules. We also offer made-to-print and custom parts. Unicorp Electronic Hardware is used by leading companies in nearly every industry including electronics, telecommunications, aerospace, military, medical, computer, automotive, energy, robotics, marine, PCB mounting & circuit board assembly, security, entertainment, industrial equipment and many more. UNICORP ELECTRONIC HARDWARE
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