[Paul Berger]

Yeah for me IPA=India Pale Ale


On 2018-01-27 2:45 PM, Henry Bond via cctalk wrote:
> 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.
>>>>
>>>>