On Friday 19 April 2019 06:27:56 TJoseph Powderly wrote: > -------- Forwarded Message -------- > Subject: Re: [Emc-users] ER ATC tool idea > Date: Fri, 19 Apr 2019 17:15:50 +0700 > From: TJoseph Powderly <tjt...@gmail.com> > To: Andy Pugh <bodge...@gmail.com> > > > > Gene, > > On 04/19/2019 06:52 AM, Andy Pugh wrote: > >> On 19 Apr 2019, at 00:47, Ken Strauss <ken.stra...@gmail.com> > >> wrote: there is no obvious way that the threads would achieve that > >> level of concentricity. > > > > You can still register on the taper. Solid “collets” and > > off-the-shelf nuts seem so obvious that I am puzzled that I have > > never found them. It solves the tool length puzzle at a stroke. > That it would, but if the nut is off the shelf, the face of the collet will need to loose some of the OD of its extractor groove, or the nut will need it turned away. I've not succeeded yet in making a collet, with a fitting tool shank already in it snap past the eccentric and assume its proper position in the nut. The collet must be able to flex ever so slightly in order to engage the extractor eccentric. And that leaves us looking for a way to reliably extract the solid collet should it decide to stick, and at the std anglesused, it will.
> here's your chance to make use of that induction heater thread from a > while back. Which brings up the performance of my pacemaker in the near field of one of those. Lets just say its not recommended. Although I have walked around in the field of a 2500 watt ATU being driven at .98MHz w/o any ill effects. Close enough my IR thermometer, looking for hot joints, went totally berzerkly, reading room temp or slightly warmer parts at -176F. Gotta get me a more better one. :) That one failed at about 60" away from those air wound coils, sized for a 25k transmitter. With the new Vector Network Analyser tool I've bought, I'll have to get right up in its face personal, but not while under that sort of power, probably well under a watt of drive to measure it and tune it correctly. And hope its not fouled up by other nearby (50 miles is nearby) radio stations. I have found that not only am I a dying breed of engineer, one who actually fixes 60 yo transmitters, that all the engineers with the stuff to do an ATU tuneup, have already died. Theres no longer any magic in saying you are a radio engineer, hasn't been in 50 years thanks to the FCC throwing 1st phones under the bus in the '70's. So there are not any youngsters with any interest in doing something like this. I can pay for this gizmo, doing a non-directional for 10% of what was being charged 40 years ago, with the first 2 jobs, so why not? > you could make solid collets for heat shrink tooling :-) > heck, they could be solid collet-nuts > no concentricity problems ( except in manufacture , got a jig grinder > ? ) No, at least nothing that could make the nuts threads in that limited amount of space. I love the idea, but it would need a whole new ejector scheme to be invented. Take care TomP. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
