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 <cct...@classiccmp.org> wrote: > ipa as in beer? > > On Sat, Jan 27, 2018 at 12:17 PM, Carl Claunch via cctech < > cct...@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 <fri...@fritzm.org> > > > To: "General Discussion: On-Topic and Off-Topic Posts" > > > <cctalk@classiccmp.org> > > > Subject: ultrasonic cleaning for disk heads > > > Message-ID: <9f2c2ac7-1b35-46f5-bd92-cc3dfd29f...@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. > > > > > > > > >