[DeTomaso] New approach to ZF cleaning

Dave Londry davel at emspace.com
Mon Jul 24 20:29:52 EDT 2017


!!!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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