[time-nuts] Rakon HSO-14

[Bruce Griffiths]

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 <kb8tq at 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.griffiths at xtra.co.nz mailto:bruce.griffiths at 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 <kb8tq at n1k.org mailto:kb8tq at 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 <phk at phk.freebsd.dk mailto:phk at phk.freebsd.dk > wrote:
> > > > 
> > > >                 --------
> > > >                 In message <0f9a9acc-4cdf-780f-e633-6162622641e3 at earthlink.net mailto:0f9a9acc-4cdf-780f-e633-6162622641e3 at 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
> > > >                 phk at FreeBSD.ORG mailto:phk at 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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>