We run four lines , have not experineced any thing like you have described , had machines for three years . pleased with their performance. >Folks, > >We are getting closer to being very happy with DEK stencil printers of the 265 GSX variety. Problems continue arising >concering autoflex tooling pin breakage. > >We are told by the DEK engineering establishment they are seeing very little breakage but ours. All be it, we do run 6 >SMT lines front ended with these nearly great machines (maybe not quite MPM calibre), and we see about 5 pins break at the "glans" >interface where the pin is screwed and loctited into the retainer cup/drive piston. We run many different board >configurations with about 12 million placements per month with a great majority being fine pitch requiring corresponding pins. > >The break is as if some torsional or side loading force was excercized. Upon further examination, while understanding the >acceleration and air pressure force (10 Bar or about 140 psi? accelerating the pins from 0 to 60 in a nanosecond) we see >evidence of complete separation of the pin from its retainer. The metal seems fatigued with a small tip left remaining as if >it had been subjected to tensile and elongation testing and failed the pull at about 10K psi. > >The pins probably are machined on swiss screw equipment. They are necked down just before the threads meet the main shaft >body. This is wherein lies the probable cause. It is possible the pins are fatiguing because of acceleration and some side >loading after acceleration and upon making board contact when the table rises. > >The question is: Do any other DEK users have similar problems? If so, how often and why do you think it's happening? > >Thanks, > >Earl Moon > >################################################################ >TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c >################################################################ >To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: >To subscribe: SUBSCRIBE TechNet <your full name> >To unsubscribe: SIGNOFF TechNet >################################################################ >Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. >For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 >################################################################ > > > Melvin B. Moschler, Jr. Process Engineer K-Byte Hibbing Manufacturing/ Hibbing Electronics Corporation 3125 14th Ave E., P.O. Box 129 Hibbing MN, 55746-0129 phone: 218-262-8213 fax: 218-263-8970 e-mail : [log in to unmask] ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################