[Fot] [Shop-talk] Blast Media

[malaboge at aol.com]

Susan-

I have used a tumbler on carb parts.? The medium in my tumbler is left over from competitive shooting days and was meant to polish brass, which it did to a fine degree.? The stuff in my tumbler ( I have forgotten the name of it) is green and organic of some sort (also used?a sandy dirty red compound previuosly) and I added a dollop of Mothers Polish to the media.? This combo made the brass look like new.? However, it will only "somewhat" clean aluminum, but not well.? It also leaves it a bit darker in hue after tumbling. I have never tried the walnut shells so have no direct results to share.? If you decide to use the walnut shells, please let us all know as my tumbler sits here unused.

If you are going to tumble the SU pistons or domes, I would tape the inside of the domes and the grooved area of the pistons, just to be safe.

Always ready for a tumble......
???????????????????? Nick in Nor Cal


-----Original Message-----
From: Susan Kahler <susank at 141.com>
To: malaboge at aol.com
Cc: nogera2 at att.net; fot at autox.team.net
Sent: Thu, 1 Jan 2009 6:10 pm
Subject: Re: [Fot] [Shop-talk] Blast Media


Hey Nick, et al,

We have been wondering about tumbling our dashpots and other carb parts in our tumbler with walnut-shell media. I have seen some carbs that have been similarly done and they seem to become nice and clean but retain the original surface. Do you have any experience with this media?

Susan????? :)


malaboge at aol.com wrote: 

Bob-

SU's have a sort of "sealed" or "finished" quality to their surface.? Any type of blasting will destroy that original "patina".? If you are rebuilding the carbs for show or originality, that surface will be lost.? If you're just trying to get some ol LBC back on the road, go ahead and blast away.
Laquer thinner and brushes have always been useful here...a little smelly and time consuming, but the look they way they came from the factory when you're done.

Even tho I've been blasted a time or two...still original...
???????????? Nick in Nor Cal

-----Original Message-----
From: nogera2 at att.net
To: Shop Talk <shop-talk at autox.team.net>
Sent: Thu, 1 Jan 2009 8:27 am
Subject: [Shop-talk] Blast Media



I need to clean up a fuel pump housing and a couple of SU carbs before
rebuilding them. What would be the best blasting media for this type of
metal?

Thanks 

Bob 
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