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Unread 07-25-2013, 09:42 PM   #1
Tom M
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Default Blast Cabinets are a blast!

30 minutes with a scrub brush and parts cleaner vs. 15 minutes in a cheap HF blast cabinet....
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Unread 07-26-2013, 12:20 AM   #2
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thats amazing.
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Unread 07-26-2013, 09:02 PM   #3
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I love my el cheapo sand blaster. I bought a bag of the finest sand they had. It basically leaves Al alone.

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doug

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Unread 07-26-2013, 11:10 PM   #4
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Nice ! what are you blasting with... soda.. sand.. nut shells ?
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Unread 07-26-2013, 11:34 PM   #5
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That was good 'ol harbor freight glass beads. I may try aluminum oxide mixed in soon to see if I can get a slightly less shiny surface. I don't really know for sure what these parts were like brand new in the 80's but my sense is that the glass beads are giving it a slightly more reflective/shiny look than they originally had. Although looking at those pictures, it looks pretty darn close to new I'd say...
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Unread 07-27-2013, 01:53 AM   #6
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This thread is once again proof that doing work good is 50% having the right tools. You could scrub that cover for a week with bristle brushes and industrial cleaner and it might look 10% better. The right tool does it in 20 minutes however and makes it factory new.

Thats working smarter, not harder!
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Unread 07-27-2013, 02:07 AM   #7
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Wash it, wash it, then wash it again. Blast it with clear air, then wash it again.

Each grain of Silica sand has 16 facets.

I've had a cabinet for ages. It's put away now, but when you gotta have it, you gotta have it. I did most all my 928 engine parts in there except the big stuff which went to the machine shop tank.
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Unread 07-27-2013, 12:48 PM   #8
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Quote:
Originally Posted by docmirror View Post
Wash it, wash it, then wash it again. Blast it with clear air, then wash it again.

Each grain of Silica sand has 16 facets.
Spot on post! Although the cabinet just takes a few minutes, I've been known to spend countless hours cleaning parts even after blasting. If oil can touch it, it needs to be clean to the metal. If I could assemble in a clean-room, I would. Here are a couple assembly pictures highlighting the point...
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Unread 07-27-2013, 08:29 PM   #9
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Balance shaft cover? Bah, those never leak.


mmuuuuuaaaahahahahhahahahhahahahaaa!!!
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Unread 07-27-2013, 10:29 PM   #10
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I soda blasted a lot of parts on my recent rebuild. The soda is expensive, but it's an excellent technique because you can dissolve the soda away with water afterward.
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Unread 07-27-2013, 11:00 PM   #11
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What kind of soda?
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Unread 07-28-2013, 02:26 PM   #12
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Quote:
Originally Posted by Tom M View Post
What kind of soda?
Armex: http://www.armex.com/

Basically, just baking soda.

Click the image to open in full size.
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Unread 07-31-2013, 07:23 AM   #13
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Quote:
Originally Posted by pontifex4 View Post
I soda blasted a lot of parts on my recent rebuild. The soda is expensive, but it's an excellent technique because you can dissolve the soda away with water afterward.
Boom!

In Australia, most of the garnet you buy must be dissolvable in water for health issues.
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Unread 07-31-2013, 10:14 AM   #14
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What clean up do you need perform to make sure your contact surfaces. doesnt that piece have a press in bearing.
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Unread 08-01-2013, 03:30 PM   #15
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Indeed they are!

I use walnut shells if the parts just need cleaning and aluminum oxide if they need paint removed. I did have some glass bead, but since most of the stuff I'm blasting I powdercoat after, I avoid glass bead since it likes to embed itself into aluminum more than other media.
Soda works well too, but it does get expensive. They say you can't use a normal media blaster with soda, but I never had any problems running it in mine. Nor did I reusing the soda. It's definitely a lot more susceptible to moisture though so make sure you have good dry air (I use a refrigerated air dryer).

Here's my cabinet (I started with a small harbor freight one and a 20gal compressor). I'm currently using a siphon feed gun as I want to hook up my 90lb pressure pot blaster to a footswitch so I can use it in this cabinet. Previously I used the pressure pot blaster in the HF cabinet, but it was a pain to have to take my hands out to manually turn on/off the blaster.

Click the image to open in full size.

And my compressor/air dryer (80gal 2stage; good for ~18cfm):
Click the image to open in full size.
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