[TMC] Vox question

[Chris Bolkan]

Well there you go! Thanks Tom. I've never seen a 12-24! It's sure not on my
bolt sizing tool.

Thanks for the education! Now I need to run down a 12-24 tap and die!

Thanks again!

Chris



On Wed, Mar 30, 2022 at 7:35 PM Tom Brent <navyradiocom at gmail.com> wrote:

> Chris, you probably need a #12-24. Basic diameter of a #12 screw is 0.216
> inches, in between the #10-32 (dia. 0.190) and 1/4 inch you have already
> tried. Less common are #12-28 and #12-32 threads.
>
> Tom
> ._._.
>
> Sent from my iPhone
>
> > On Mar 30, 2022, at 7:04 PM, Chris Bolkan <bolkyboats at gmail.com> wrote:
> >
> > Hello TMC lovers!
> >
> > My VOX 3 is a mess, so I disassembled it in order to clean and lube all
> of
> > the mechanicals before bringing it up electrically. In the process I
> > removed the oscillator from the oven. Good thing I did because dried up
> > grease had made things pretty sticky and non-functional in there. The cam
> > follower mechanism was too gummed up to follow the cam anymore and the
> > little follower wheel was frozen among other minor things. I fixed all
> that
> > and now everything works smoothly.......and I do not believe I messed
> > anything up during the cleanup!
> >
> > However, when I was removing the oscillator one of the four brass screws
> > that holds the oscillator in the aluminium casting galled on the way
> out. I
> > counted the thread pitch at 24 TPI and it looked like a 1/4 inch screw. I
> > did not have a 1/4-24 tap and die to chase the threads so I ordered one.
> > When it got here, I found that it was too big in diameter! I have a 10-24
> > tap and die and it was too small! I verified it is not an M6-1 thread. I
> am
> > stumped! What size are these mystery screws?!? I need to chase the
> threads
> > on the screw and clean the threads in the casting before reassembling
> > the oscillator.
> >
> > Did I say I'm stumped?
> >
> > Many thanks!
> >
> > Chris
> > KI7NXY
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