Hello Guy, I think that you have found the good explanation!
May be some of these knobs don't get a correct or sufficient pre-aging (?) procedure before leaving the factory; at my QRL pro, we get this kind of problem with molded plastic enclosure breaking some time after they were bee assembled. In French, we are speaking of "retrait" but i don't find the correct translation! My best 73, Rudi, HB9ARI On 23.06.2011 19:31, Guy Olinger K2AV wrote: > Having managed to break a few myself (have to remind myself I'm not > rebuilding an auto engine), I think what is going on is that the knobs > are (or were) still curing, causing them to shrink a tiny bit after > being tightened on the shaft. > > I think the curing accelerates after being put on the radio because > they have free air around them, instead of being in a bin or box. I > found the screws TIGHTER a week after I put the knobs on. I simply > loosened and retightened them to "pinky torque" and no problems since. > > Pinky torque is to use your pinky ONLY as pressure on the allen wrench > when tightening. One probably does not even need that much. > > 73, Guy. > > On Thu, Jun 23, 2011 at 1:46 AM, hb9ari<[email protected]> wrote: >> Hi Brian, >> >> Thank you for the reply. >> As i bought an assembled K3, i don't >> tighten the screws. >> As Tim explained in his message, this "problem" >> was present sometimes in a particular batch. >> >> I will send an email to the "parts" department. >> >> My best 73, >> Rudi, HB9ARI >> >> >> >> On 23.06.2011 00:50, Brian Maynard wrote: >>> I had the same problem at the time I built K3 #4974. Elecraft sent >>> replacements right away (the usual excellent service), and coached me not to >>> over tighten the set screws (two per knob). The knobs are pretty soft and >>> deform easily if over tightened. >>> >>> ----- >>> Brian, op K1NW >>> -- >>> View this message in context: >>> http://elecraft.365791.n2.nabble.com/Concentric-knobs-tp6502754p6506455.html >>> Sent from the Elecraft mailing list archive at Nabble.com. >>> ______________________________________________________________ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:[email protected] >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[email protected] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
