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WINTER 2017

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Distributor's Link Magazine Winter Issue 2017 / Vol 40 No1

14 THE DISTRIBUTOR’S

14 THE DISTRIBUTOR’S LINK Laurence Claus Laurence Claus is the President of NNi Training and Consulting, Inc. He has 25 years of experience with a medium sized automotive fastener manufacturer, holding positions including Vice President of Engineering, General Manager, Director of Quality, Director of New Business Development and Applications Engineer. In 2012 he formed NNi offering technical and business training courses as well as technical consulting, expert witness and consultation work. He can be reached at 847-867-7363 or by email: Lclaus@NNiTraining.com. You can learn more about NNi at www.NNiTraining.com. FUNDAMENTALS OF THREAD FORMING SCREWS - PART 2: THREAD FORMING SCREWS FOR THERMOPLASTICS Review Looking back at Part 1 of this series, we explored the fundamental science of thread forming screws. We learned that although the material the screw is thread forming is important in how we view the entire system, FIGURE 1: HOW A THREAD FORMING SCREW WORKS- GRAPH OF TORQUE VERSUS TIME there are certain universal fundamentals about thread forming that are independent of the material. We learned that during installation all screws, but especially thread forming screws, experience an immediate increase in torque followed by a gradual but continuous rise in torque up until the point the head is seated against the captured material. This inflection point is normally referred to as the driving torque. As the installer continues to turn the screw, torque rises rapidly until the joint fails by either the screw breaking (less common) or the joint stripping (more common). This point is often referred to as the ultimate torque or stripping torque. It is during this time, from when the head seats to the ultimate failure, that the joint is developing the desired axial clamp load. We learned that engineers designing thread forming joints are extremely interested in the value of these two points, and particularly the range between them. The resulting drive to ultimate ratio is a strong determining factor in whether the joint can be safely and consistently assembled or not. If the band is too narrow, it is likely that normal installation equipment cannot adequately handle the deviation and parts will be prone to either not being fully installed, breaking during installation, or both. TECHNICAL ARTICLE CONTINUED ON PAGE 100

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    THE DISTRIBUTOR’S LINK 63 Alfa To

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    66 THE DISTRIBUTOR’S LINK GENERAL

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    THE DISTRIBUTOR’S LINK 69 The Cab

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    72 THE DISTRIBUTOR’S LINK WOMEN I

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    THE DISTRIBUTOR’S LINK 77 The Bos

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    82 THE DISTRIBUTOR’S LINK GLOBALF

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    84 THE DISTRIBUTOR’S LINK Beacon

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    MAFDA 2016 ANNUAL GOLF & SCHOLARSHI

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    90 THE DISTRIBUTOR’S LINK NORTH C

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    92 THE DISTRIBUTOR’S LINK North E

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    THE DISTRIBUTOR’S LINK 95 BENGT B

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    THE DISTRIBUTOR’S LINK 97 WORDSEA

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    100 THE DISTRIBUTOR’S LINK LAUREN

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    104 THE DISTRIBUTOR’S LINK GUY AV

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    106 THE DISTRIBUTOR’S LINK NIFMSE

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    108 THE DISTRIBUTOR’S LINK JOE DY

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    110 THE DISTRIBUTOR’S LINK DENNIS

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    112 THE DISTRIBUTOR’S LINK JIM TR

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    114 THE DISTRIBUTOR’S LINK MID-WE

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    116 THE DISTRIBUTOR’S LINK The Fa

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    118 THE DISTRIBUTOR’S LINK ANTHON

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    STAFDA 40TH ANNUAL CONVENTION & TRA

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    THE DISTRIBUTOR’S LINK 127 YOUNG

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    130 THE DISTRIBUTOR’S LINK GENERA

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    THE DISTRIBUTOR’S LINK 133 WORD S

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    THE DISTRIBUTOR’S LINK 135 PACIFI

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    138 THE DISTRIBUTOR’S LINK DURAFO

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    Bay Supply, a division of Bay Faste

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    146 THE DISTRIBUTOR’S LINK LAUREN

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    148 THE DISTRIBUTOR’S LINK ROBERT

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    150 THE DISTRIBUTOR’S LINK MWFA 3

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    152 THE DISTRIBUTOR’S LINK DURAFO

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    Leading the way in ERP technology D

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    MFDA 21st ANNUAL GOLF OUTING & COCK

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    160 THE DISTRIBUTOR’S LINK FASTEN

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    162 THE DISTRIBUTOR’S LINK LAUREN

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    THE DISTRIBUTOR’S LINK 165 Interc

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    MFDA 21st ANNUAL GOLF OUTING & COCK

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    THE DISTRIBUTOR’S LINK 169 LAUREN

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    NATIONAL INDUSTRIAL FASTENER & MILL

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    174 THE DISTRIBUTOR’S LINK MWFA 3

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    176 THE DISTRIBUTOR’S LINK Falcon

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    178 THE DISTRIBUTOR’S LINK MWFA 3

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    180 THE DISTRIBUTOR’S LINK NEW EN

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    THE DISTRIBUTOR’S LINK 183 PUZZLE

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    NATIONAL INDUSTRIAL FASTENER & MILL

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    MFDA TABLE STOP SHOW - HILTON MEADO

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    MFDA 21st ANNUAL GOLF OUTING & COCK

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    MWFA 70th ANNIVERSARY CELEBRATION &

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    194 THE DISTRIBUTOR’S LINK A ABBO

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    198 THE DISTRIBUTOR’S LINK I cont

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