[Henry Bond]

Isopropyl alcohol would be a sensible guess, I've not seen that
abbreviation before though .

- H

On Sat, Jan 27, 2018, 18:24 Adrian Stoness via cctech <cctech at classiccmp.org>
wrote:

> ipa as in beer?
>
> On Sat, Jan 27, 2018 at 12:17 PM, Carl Claunch via cctech <
> cctech at classiccmp.org> wrote:
>
> > The IPA is heated to 60C before the ultrasound is able to remove the
> oxide
> > remnants, FWIW.
> >
> > While we can often get the entire smooth surface of the head clean with
> > swabs and IPA, it is very difficult to clean all the material that forms
> in
> > the cruciform trench recessed into the head (where the read/write and
> erase
> > coil poles are visible).
> >
> > Heads can seem clean to the naked eye, but a good stereo microscope will
> > insure that you have a clean and smooth surface.
> >
> > Regards,
> >    Carl
> >
> > Date: Fri, 26 Jan 2018 12:15:34 -0800
> > > From: Fritz Mueller <fritzm at fritzm.org>
> > > To: "General Discussion: On-Topic and Off-Topic Posts"
> > >         <cctalk at classiccmp.org>
> > > Subject: ultrasonic cleaning for disk heads
> > > Message-ID: <9F2C2AC7-1B35-46F5-BD92-CC3DFD29FBFA at fritzm.org>
> > > Content-Type: text/plain;       charset=utf-8
> > >
> > > I watched with great interest one of curiousmarc?s recent Alto videos,
> > > wherein they clean a Diablo drive head ultrasonically.  I?ve been
> > > struggling a bit with my restored RK05 drives to completely clean the
> > heads
> > > after minor head crashes.  Not being able to get them really sparkling
> > > clean makes me always worried about running the drives for more than a
> > few
> > > minutes at a time, and a little nervous every time I spin them up?.
> > > Scrubbing and scrubbing and scrubbing with IPA and kimwipes just
> doesn?t
> > > seem to get all the crud off.
> > >
> > > I do have an alignment pack that I could use to re-align the heads
> after
> > > removing them for a proper cleaning this way.  Decent ultrasonic
> cleaners
> > > aren?t terribly expensive and might be nice to have around the shop
> > anyway
> > > (I could also do all my eyeglasses :-)
> > >
> > > In the video, the heads are submerged in IPA in a glass cylinder, which
> > is
> > > then placed in the ultrasonic bath.
> > >
> > > Has anybody on the list here done this and have tips/advice beyond what
> > > can be seen in the video?  It looked very effective!  I?m also having a
> > > little trouble sourcing the squat form glass graduated cylinder online.
> > >
> > >         cheers,
> > >            ?FritzM.
> > >
> > >
> >
>