I have had numerous knobs split. None of them split while I was moving the set screw or even shortly thereafter. Most split after months of use and with no specific event happening other than moving the gain setting. The last set of knobs received about 5 or 6 months ago and supposedly with a new formula for the plastic are still hanging in there but I am still keeping the old knob from a defunct CB talkie so I at least have an audio gain. I am convinced that the problem is/was in the plastic mix and that Elecraft has done what is in their power short of buying a more expensive aluminum knob set. Willis 'Cookie' Cooke K5EWJ
________________________________ From: Ken Kopp <[email protected]> To: [email protected] Sent: Sun, May 9, 2010 1:18:46 PM Subject: [Elecraft] Split knob question If someone has a split knob in hand, please look closely at the tapped hole. Since there seem to be so many knobs splitting, I'm wondering if the manufacturer has inadvertently tapped the screw holes with a taper tap and not with a bottom tap, as should be the case. There are three degrees of tap taper in common use. The bottom tap is straight and obviously produces straight threads, but it's not as easy to start straight. A set screw screwed into a hole threaded with a taper tap would force the knob apart and might be the cause of the splitting. 73! Ken Kopp - K0PP [email protected] ______________________________________________________________ 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
