fasteners by rob shaffer james burrows. objective explain the use of: ► machine screws and nuts...
TRANSCRIPT
![Page 1: FASTENERS BY ROB SHAFFER JAMES BURROWS. OBJECTIVE EXPLAIN THE USE OF: ► MACHINE SCREWS AND NUTS ► MACHINE SCREWS AND INSERTS ► SELF THREADING/CUTTING](https://reader035.vdocument.in/reader035/viewer/2022062217/56649eab5503460f94bb0dfd/html5/thumbnails/1.jpg)
FASTENERSFASTENERSBYBY
ROB SHAFFERROB SHAFFER
JAMES BURROWSJAMES BURROWS
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OBJECTIVEOBJECTIVE
EXPLAIN THE USE OF:EXPLAIN THE USE OF:►MACHINE SCREWS AND NUTSMACHINE SCREWS AND NUTS►MACHINE SCREWS AND INSERTSMACHINE SCREWS AND INSERTS►SELF THREADING/CUTTING SCREWS SELF THREADING/CUTTING SCREWS
AND PLASTIC BOSSAND PLASTIC BOSS►THREAD FORMING SCREWSTHREAD FORMING SCREWS
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PRESENTATION RESULTSPRESENTATION RESULTS
►UNDERSTAND USE OF FASTENERSUNDERSTAND USE OF FASTENERS►UNDERSTAND DIFFERENT TYPESUNDERSTAND DIFFERENT TYPES►APPLICATIONSAPPLICATIONS
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MACHINE SCREWS, NUTS AND MACHINE SCREWS, NUTS AND WASHERSWASHERS
► USE WHERE APPEARANCE IS NOT USE WHERE APPEARANCE IS NOT CRITICALCRITICAL
►HOLES CAN BE COUNTERSUNK HOLES CAN BE COUNTERSUNK ►DEFLECTION, CYLENDRICAL BOSSES DEFLECTION, CYLENDRICAL BOSSES ►HEX SHAPE CAN BE MOLDED INTO PARTHEX SHAPE CAN BE MOLDED INTO PART
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MACHINE SCREWS, NUTS MACHINE SCREWS, NUTS AND WASHERSAND WASHERS
►DISADVANTAGESDISADVANTAGES MANY PARTS REQUIRED FOR ASSEMBLYMANY PARTS REQUIRED FOR ASSEMBLY ACCESS TO BOTH TOP AND BOTTOM OF ACCESS TO BOTH TOP AND BOTTOM OF
PARTPART LOCKING WASHERS LOCKING WASHERS
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DISADVANTAGES OFDISADVANTAGES OFMACHINE SCREWS, NUTS AND WASHERSMACHINE SCREWS, NUTS AND WASHERS
►ROTATION MOTION ROTATION MOTION ►REMOVED FOR RECYCLING OR REMOVED FOR RECYCLING OR
GRANULATION PURPOSESGRANULATION PURPOSES
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MACHINE SCREWS, NUTS AND MACHINE SCREWS, NUTS AND WASHERSWASHERS
►ADVANTAGESADVANTAGES DURABLE ASSEMBLY DURABLE ASSEMBLY EASILY DISASSEMBLEDEASILY DISASSEMBLED EASILY REASSEMBLEDEASILY REASSEMBLED
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MACHINE SCREWS WITH A MACHINE SCREWS WITH A THREADED METAL INSERTTHREADED METAL INSERT
► INSERT MOLDINGINSERT MOLDING►PLASTIC FORMS AROUND INSERTPLASTIC FORMS AROUND INSERT►NURELED AROUND DIAMETER FOR NURELED AROUND DIAMETER FOR
SLIPPINGSLIPPING
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MACHINE SCREWS WITH A MACHINE SCREWS WITH A THREADED METAL INSERTTHREADED METAL INSERT
►ADVANTAGESADVANTAGES FEWER PARTS REQUIRED FOR FEWER PARTS REQUIRED FOR
ASSEMBLYASSEMBLY INSERTS INTRODUCED DURING OR INSERTS INTRODUCED DURING OR
AFTER MOLDINGAFTER MOLDING GOOD OVERALL DURABILITYGOOD OVERALL DURABILITY REPEATED ASSEMBLYREPEATED ASSEMBLY
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PLASTIC MACHINE SCREWSPLASTIC MACHINE SCREWS
► IDEAL CHEMICAL RESISTANCE IDEAL CHEMICAL RESISTANCE APPLICATIONSAPPLICATIONS
►MATERIALS: MATERIALS: NylonNylon AcetalAcetal PolyproPolypro polyimidepolyimide
►AVALIABLE IN STANDARD MACHINE AVALIABLE IN STANDARD MACHINE THREADSTHREADS
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SELF THREADING SCREWSSELF THREADING SCREWS
►FEWER PARTS REQUIREDFEWER PARTS REQUIRED►THREADS FORMED DURING ASSEMBLYTHREADS FORMED DURING ASSEMBLY►MIN. FASTENER AND EQUIP. COSTMIN. FASTENER AND EQUIP. COST►LIMITED DURABILITYLIMITED DURABILITY►REPEATED ASSEMBLY LIMITEDREPEATED ASSEMBLY LIMITED
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SELF THREADING SCREWSSELF THREADING SCREWS
►ELIMINATES METAL NUT MEMBERELIMINATES METAL NUT MEMBER►RECEIVING THREADS RECEIVING THREADS
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SELF THREADING TERMSSELF THREADING TERMS
►DESTRUCTION TORQUE: DESTRUCTION TORQUE: torque required to cause failuretorque required to cause failure
►SEATING TORQUE: SEATING TORQUE: torque needed to attain the desired clamp torque needed to attain the desired clamp
loadsloads
►STRIP TORQUE: STRIP TORQUE: torque that would cause the nut threads torque that would cause the nut threads
to failto fail
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SELF TAPPING SCREWSSELF TAPPING SCREWS
►CUT OR TAP THEIR OWN THREADSCUT OR TAP THEIR OWN THREADS►SLASHED CUTTING SLOT SLASHED CUTTING SLOT
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THREAD FORMING SCREWSTHREAD FORMING SCREWS
►NO CUTTING CAPABILITIESNO CUTTING CAPABILITIES►DISPLACE MATERIALDISPLACE MATERIAL
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SCREW FASTENERSSCREW FASTENERS
►ADVANTAGESADVANTAGES HIGHER PULL OUT FORCE HIGHER PULL OUT FORCE DISASSEMBLY IS EASIER DISASSEMBLY IS EASIER CAN BE REASSEMBLED EASILYCAN BE REASSEMBLED EASILY
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SCREW FASTENERSSCREW FASTENERS
►DISADVANTAGESDISADVANTAGES HAS GREAT IMPACT ON RECYCLING HAS GREAT IMPACT ON RECYCLING EASILY REMOVED FOR RECYCLINGEASILY REMOVED FOR RECYCLING
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SPEACIAL THREAD SPEACIAL THREAD FORMING AND FORMING AND
THREAD CUTTING THREAD CUTTING SCREWSSCREWS
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PLASTITE SCREWPLASTITE SCREW
►NON CIRCULAR TRILOBAL CROSS NON CIRCULAR TRILOBAL CROSS SECTIONSECTION
►DESIGN REDUCES DRIVING TORQUEDESIGN REDUCES DRIVING TORQUE► IDEAL FOR VIBRATION APPLICATIONSIDEAL FOR VIBRATION APPLICATIONS►COLD FLOW LOCKS SCREW INTO COLD FLOW LOCKS SCREW INTO
PLACEPLACE
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PLASTITE SCREWPLASTITE SCREW
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PT SCREWPT SCREW
►WIDE SPACED SINGLE LEAD THREADWIDE SPACED SINGLE LEAD THREAD►30 DEGREE ANGLE OF FLIGHTS30 DEGREE ANGLE OF FLIGHTS►REDUCED RADIAL AND HOOP STRESS REDUCED RADIAL AND HOOP STRESS ►MODIFIED SHANKMODIFIED SHANK
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PT-SCREWSPT-SCREWS
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POLY FAST SCREWPOLY FAST SCREW
► 35 DEGREE LEADING EDGE 35 DEGREE LEADING EDGE ► 10 DEGREE TRAILING EDGE10 DEGREE TRAILING EDGE► SUITABLE FOR USE WITH MORE DUCTILE SUITABLE FOR USE WITH MORE DUCTILE
PLASTICSPLASTICS
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HiLo SCREWHiLo SCREW
►DOUBLE LEAD SCREWDOUBLE LEAD SCREW► THREAD FORMING AND THREAD CUTTINGTHREAD FORMING AND THREAD CUTTING►HIGH THREAD (30 DEGREE ANGLE)HIGH THREAD (30 DEGREE ANGLE)► LOW THREAD (60 DEGREE ANGLE)LOW THREAD (60 DEGREE ANGLE)►DRIVE TORQUES ARE LOWDRIVE TORQUES ARE LOW► 30 DEGREE ANGLE 30 DEGREE ANGLE
REDUCES RADIAL PRESSURESREDUCES RADIAL PRESSURES REDUCES TENDANCY FOR BOSS CRACKINGREDUCES TENDANCY FOR BOSS CRACKING
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CONCLUSIONCONCLUSION
►CONNECTING MATING PARTSCONNECTING MATING PARTS►RECYCLING CONSIDERATIONSRECYCLING CONSIDERATIONS►DESIGN CONSIDERATIONSDESIGN CONSIDERATIONS
VIBRATIONVIBRATION PULLOUT FORCE PULLOUT FORCE DEFLECTIONDEFLECTION
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THE ENDTHE END