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. > > > > _______________________________________________ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
