[DeTomaso] New approach to ZF cleaning

[Dave Londry]

Needs air though.
Wait - maybe another !!!tool opportunity!!!.


On 7/24/17 5:29 PM, Dave Londry wrote:
> !!!TOOL OPPORTUNITY!!!
> Media blasting box (40 pounder) $180
> Bag of soda medium (50 pounds) $18
> All at HFrt.
> Dave
> (who swears he'll never buy another Chinese-made tool
>    and then here he is - sending someone else there)
>
>
> On 7/24/17 3:58 PM, Himes, Terry (397C) wrote:
>> Larry,
>>
>> You must live in an area where there is lots of that needed. Here in 
>> Sandy Eggo, I couldn’t find anyone.
>> I was looking for someone to do "soda blasting."  Which uses sodium 
>> bicarbonate (large, granular baking soda).
>> Allegedly, used for aircraft restoration.
>>
>> Terry
>>
>>
>> "A Purple Heart proves you were smart enough to hatch a plan,
>>   stupid enough to try it and lucky enough to survive!"
>>   Terry W. Himes
>> JPL Jet Propulsion Laboratory
>> Dawn Spacecraft Team
>> Rosetta Sequence Team Lead
>> Phone: (818) 393-6261
>> Cell:     (818) 653-8213
>> thimes at jpl.nasa.gov
>> 🇺🇸
>>
>> On 7/24/17, 3:49 PM, "DeTomaso on behalf of Larry Finch via DeTomaso" 
>> <detomaso-bounces at server.detomasolist.com on behalf of 
>> detomaso at server.detomasolist.com> wrote:
>>
>>      All,
>>           My interest in Rub ’n Buff is driven by the fact that I now 
>> have a VERY clean ZF.
>>           I am not aware of anyone having done this previously, but I 
>> had my ZF cleaned using dry ice blasting. It uses shaved or 
>> pelletized dry ice at a low nozzle pressure (60psi).
>>      There is no media to infiltrate the ZF and so I had it cleaned 
>> fully assembled.  :-)
>>           This process is not yet widespread, but is often used for 
>> in-place cleaning of entire food processing/packaging facilities, as 
>> it leaves nothing behind that wasn’t already there.
>>           Search WIKI for ‘dry ice blasting’ to learn more.
>>           The photos below are the before and after.
>>           It was more or less clean, but had a deep-in-the-pores oily 
>> finish that resisted actually getting much cleaner.
>>           The process took about four hours of shop time. My cash 
>> price was $300. I had them avoid the side plates, but blasted the 
>> poor paint from the rear cover.
>>           It is now amazingly clean, and my goal is to somehow keep 
>> it that way. It does not, of course, present a uniform finish despite 
>> being uniformly clean.
>>      Forty-five years of use leaves issues. Perhaps a more aggressive 
>> media would have abraded enough of the long-term stains and flaws to 
>> a more uniform finish,
>>      but you can’t do that with an assembled ZF.
>>           Thanks to all here and on the PI forum for their feedback. 
>> Universal response for Rub ’n Buff is positive and my eBay $5.49 
>> tube, with free shipping, is on the way.
>>           Larry
>>
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