There is abrasive entrained in the fluid stream. Operation is in the ductile grinding regime so fluid pressures are around 6 bar or so, way below that used in abrasive water jet cutting.
It has been used to machine/polish crystal quartz waveplates and to machine/polish the surface of silicon wafers before uses for MEMS fabrication. Its even been used to carve channels in silicon wafers in such applications. Bruce > On 04 February 2018 at 15:26 Bob kb8tq <kb...@n1k.org> wrote: > > Hi > > Unfortunately ( at the rates you must use) the “blast it with a fire > hose” approach > is not very fast….. > > Bob > > > > > On Feb 3, 2018, at 8:15 PM, Bruce Griffiths > <bruce.griffi...@xtra.co.nz mailto:bruce.griffi...@xtra.co.nz > wrote: > > > > > > 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 > > > mailto: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 mailto:p...@phk.freebsd.dk > wrote: > > > > > > > > -------- > > > > In message > > > > <0f9a9acc-4cdf-780f-e633-616262264...@earthlink.net > > > > mailto: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 mailto: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 > > > > mailto: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 > > > mailto: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.