[R-390] Chassis Cleaning

[Curt]

We started doing dry ice blasting in late 80's for cleaning machines in 
the plant.  It leaves ZERO residue.  Soda blasting is pretty much the 
same but you need to rinse off the remaining soda with water, then we 
bake the units if they had wire harnesses or other electronics inside.  
Leaves and almost polished finish..no need to even sand it unless you 
want to add some 'tooth" for paint.

Curt


On 10/31/2011 11:19 AM, ka9egw at britewerkz.com wrote:
> When I was working part time at a local motorcycle shop, there was a body
> shop guy we used who used to have a setup to blast with powdered dry
> ice...took all the paint, rust, bondo etc off slick as a whistle without
> disturbing the surface of hte metal...
>
> 73, Brian KA9EGW
>
>> I would NEVER use sand to blast a pc of aluminum...unless you want it to
>> look sandblasted.  If you want to clean it without impacting the
>> surface, try soda blasting.   Same type equipment (check Harbor Freight
>> for inexpensive setup)
>>
>> It is essentially baking soda.  washit off with water...will take of
>> haze and paint without roughing up the aluminum surface.
>>
>>
>> Curt
>>
>>
>>
>> On 10/31/2011 10:18 AM, kirklandb at sympatico.ca wrote:
>>> Media blasting (sand, glass etc being the media).
>>>
>>> My gun has  ceramic nozzle.
>>>
>>> You can get a sand blasting cabinet so that you have a closed system.
>>> This recovers the media and you can re-use.
>>> You can also use it outside in which it is much harder to re-use the
>>> media.
>>>
>>> With sand/silicon you don't want to breath the dust. You also have to
>>> keep in mind the old paints contained LEAD and you
>>>     don't want to breath that either.
>>>
>>> You can check out some of the gear at Princess Auto (Canada) but I
>>> suspect the US has equivalent stores.
>>>
>>>> Date: Mon, 31 Oct 2011 09:46:05 -0500
>>>> From: ba.williams at charter.net
>>>> To: r-390 at mailman.qth.net
>>>> Subject: Re: [R-390] Chassis Cleaning
>>>>
>>>> Bob
>>>>
>>>> I used to sandblast when I was out of highschool. For metal work, we
>>>> called it sand texting and I've heard it's called something else now.
>>>> Same hose pressure but small metal nozzles with finer 'sand.' It will
>>>> leave a satin like finish pitted into the surface. Think receivers on
>>>> lever action.
>>>>
>>>>
>>>> the other Barry
>>>>
>>>>
>>>>> I've used several detergents, "mixtures", etc. with some success at
>>>>> cleaning really grimy chassis. Has anyone tried sand blasting? I know
>>>>> sand isn't always the medial used, e.g. beads, walnut shells, are
>>>>> popular.
>>>>>
>>>>> What sort of media are best? What kind of gun is used? How much air
>>>>> pressure? How much media is expended? etc. etc. What precautions
>>>>> should be made, e.g. (a) for the person and (b) for the chassis, etc.?
>>>>>
>>>>> Thanks,
>>>>>
>>>>> Bob AG5X
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>
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