Fluid jet polishing perhaps?

At least on fused quartz and optical glass there is no associated subsurface 
damage.

Bruce

> 
>     On 04 February 2018 at 14:05 Bob kb8tq <kb...@n1k.org> wrote:
> 
>     Hi
> 
>     If you try “normal” machining techniques on a resonator, you are very
>     likely to create micro cracks in the material. Those are *really* bad for
>     aging and a few other issues ….. Much of the normal production flow of the
>     quartz is designed to keep the processes like sawing far enough away
>     from the “end product” that more gentle techniques can be used to remove
>     the (possibly) damaged material.
> 
>     Since the slots are pretty darn small, there isn’t a lot of room for this 
> and that
>     to be done when making them. There may well be better ways to do the
>     work today than back 20 or 30 years ago. It would still take a *lot* of 
> effort
>     to validate a process.
> 
>     Bob
> 
>         > > 
> >         On Feb 3, 2018, at 7:24 PM, Poul-Henning Kamp <p...@phk.freebsd.dk> 
> > wrote:
> > 
> >         --------
> >         In message <0f9a9acc-4cdf-780f-e633-616262264...@earthlink.net>, 
> > jimlux writes:
> > 
> >             > > > 
> > >                 > > > > 
> > > >                 [1] Surprising to me is that modern dentists are highly 
> > > > kitted for
> > > >                 CNC-ing very hard ceramic materials at high precision.
> > > > 
> > > >             > > > 
> > >             But, small "tooth sized" pieces - how big is your crystal.
> > > 
> > >         > > 
> >         Well, they appearantly make a mouth-full at a time, so that is
> >         covered...
> > 
> >         I don't think the dentist machines are precise enough though,
> >         as I understood it, the state-of-the-art stuff has built in
> >         laser-interferrometers etc.
> > 
> >         --
> >         Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
> >         p...@freebsd.org | TCP/IP since RFC 956
> >         FreeBSD committer | BSD since 4.3-tahoe
> >         Never attribute to malice what can adequately be explained by 
> > incompetence.
> > 
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> >     > 
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