[R-390] Chassis Cleaning

[Ba.Williams]

Dry ice? That's a neat idea. 

One place where I worked had a crude outside shed that was like a sand box for retrieving sand. I also used the big booths that took rolling carts.

I never heard of anyone using masks back then. I worked only with silica and carborundum.


The other Barry



Sent from my iPad

On Oct 31, 2011, at 11:35 AM, Curt <cptcurt at flash.net> wrote:

> 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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