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Grit blasting [message #58513] Wed, 12 December 2012 23:28 UTC Go to next message
avatar Atso  is currently offline Atso
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Has anyone tried using one of these on their 3D print?

http://www.everythingairbrush.com/acatalog/info_AB_178.html
Re: Grit blasting [message #66039 is a reply to message #58513 ] Fri, 12 April 2013 03:30 UTC Go to previous messageGo to next message
avatar pumpjet  is currently offline pumpjet
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I use it now.
Be forewarned though. Do NOT use Aluminum Oxide or Silicon Carbide grit!! It is nasty stuff and you need a face respirator to keep from
getting Silicosis. The little mask in the kit is useless with these grit.

Ok I had to modify mine to allow more air flow because I use Baking Powder. It is a mild abrasive so it can do a good job with out cutting into your designed part.
It is like talc so the holes need to be opened up to allow more air flow.
I have tried an unmodified one and it seems to work fine with out the modification. Go figure.

Ok you need absolutely dry air for this to work. A small compressor with a moisture trap in line plus the trap in the hose and you are OK.
Pressure setting is between 25-65 PSI.
I set mine to 40 to defrost the FUD parts I have and it works great. But I had to try different PSI settings to get it right.

The Baking Powder is dirt cheap and I have about 7 pounds and it cost less then 5 bucks. Once you get it pushing the baking power, it gets everywhere. I use the face respirator too. The kind with cartridges on it.
I use mine outdoors so it isn't too bad. The tip has a tendency to get clogged up with baking power too. Not much but you will need to use a
piece of 30 gauge wire to push it down the opening. Be careful or you can damage the air tube behind the tip insert. I just unscrew my tip and use a needle to open the orifice back open. And then once you depress the trigger you get a cloud of powder before the pressure kicks in and at that point you start cleaning your parts. The more delicate the detail, the less air pressure and longer time to clean them up.

Good luck!

Bob
Re: Grit blasting [message #67047 is a reply to message #66039 ] Mon, 29 April 2013 11:47 UTC Go to previous messageGo to next message
avatar dcyale  is currently offline dcyale
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Do you have any before and after pics to show the difference?
Re: Grit blasting [message #67054 is a reply to message #67047 ] Mon, 29 April 2013 13:30 UTC Go to previous messageGo to next message
avatar pumpjet  is currently offline pumpjet
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I'll have to find some un blasted parts. I'll keep you posted when I get them

Bob
Re: Grit blasting [message #68702 is a reply to message #67054 ] Sun, 26 May 2013 03:38 UTC Go to previous messageGo to next message
avatar pumpjet  is currently offline pumpjet
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Just got finished soda blasting some FUD that was really heavily frosted.

Pics are before and after the soda blasting. 35 PSI setting.

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Re: Grit blasting [message #68703 is a reply to message #68702 ] Sun, 26 May 2013 03:39 UTC Go to previous messageGo to next message
avatar pumpjet  is currently offline pumpjet
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next 1index.php?t=getfile&id=33079&private=0

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Re: Grit blasting [message #68705 is a reply to message #68703 ] Sun, 26 May 2013 03:41 UTC Go to previous messageGo to next message
avatar pumpjet  is currently offline pumpjet
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soda blasting completedindex.php?t=getfile&id=33080&private=0

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Re: Grit blasting [message #68706 is a reply to message #68705 ] Sun, 26 May 2013 03:42 UTC Go to previous messageGo to next message
avatar pumpjet  is currently offline pumpjet
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back side image
index.php?t=getfile&id=33082&private=0

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Re: Grit blasting [message #68707 is a reply to message #68706 ] Sun, 26 May 2013 04:13 UTC Go to previous messageGo to next message
avatar dcyale  is currently offline dcyale
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That's kind of amazing. I guess I need another toy to play with.

Re: Grit blasting [message #69999 is a reply to message #68707 ] Tue, 18 June 2013 01:26 UTC Go to previous messageGo to next message
avatar patmat2350  is currently offline patmat2350
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Pumpjet- did you use standard kitchen baking soda? Or the large grain stuff intended for grit blasting?

The large grain should flow better... but I don't know if I want to order a big bag of the stuff!

I also see mention of corn starch being used, I may give that a try...

[Updated on: Tue, 18 June 2013 01:27 UTC]

Re: Grit blasting [message #70005 is a reply to message #58513 ] Tue, 18 June 2013 03:36 UTC Go to previous messageGo to next message
avatar pumpjet  is currently offline pumpjet
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Hi Patman

I use the standard Arm and Hammer baking powder. The stuff you find in the supermarket. I did find that sifting the baking powder
through a mesh coffee filter ( the kind you can get at Walmart ) really improved grit flow as the sifting allowed me to remove the chunks
that were in the in box of powder.
My parts are very small and very intricatly detailed. So I have to adjust the pressure down as I have
blown some part details off the FUD. Then I git to find them and superglue it back on the part.

I get my IJN parts here:
http://www.shapeways.com/shops/modelshipjp

and

http://www.shapeways.com/shops/modelship

Nice funnel vents by the way.

Any luck on the 14 LPI stud link chain? I have found no stud link 14/15 LPI chain, only regular chain (rats)

Bob
Re: Grit blasting [message #70006 is a reply to message #58513 ] Tue, 18 June 2013 03:38 UTC Go to previous messageGo to next message
avatar pumpjet  is currently offline pumpjet
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Opps my bad, patmat2350 not patman. begging for forgivness here Smile

Bob
Re: Grit blasting [message #70075 is a reply to message #70006 ] Wed, 19 June 2013 00:38 UTC Go to previous messageGo to next message
avatar patmat2350  is currently offline patmat2350
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Perfect! Got a new/old Paasche air eraser on ebay, $40, and a pound of baking soda from the kitchen, it worked great... parts are all clean now (finally).

No love on the small chain, Shapeways refuses to print the small size (wire < 0.6mm).

Re: Grit blasting [message #70079 is a reply to message #58513 ] Wed, 19 June 2013 03:02 UTC Go to previous messageGo to next message
avatar pumpjet  is currently offline pumpjet
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Welcome to grit blasting!! There are vids on you tube about this process. Interesting stuff.

I don't understand why Shapeways won't go smaller then .6mm. The radars I have have smaller that .6 for sure. Those are the ones's that
the air eraser can blow off the simulated radar array.

I wonder if they changed their file qc processes. I suspect that it could be the file format, .STL vs cad vs whatever. I do know that the IJN parts are done
in a stl file format as Shingo did a screen capture of one of his designs. And it said stl.

I believe the smallest nozzle size .3mm. Maybe the printer is different from your chain and my IJN stuff...
I just checked on one of my screwed up radars and it is definately smaller then .6mm

Bob
Re: Grit blasting [message #70081 is a reply to message #58513 ] Wed, 19 June 2013 05:33 UTC Go to previous message
avatar dcyale  is currently offline dcyale
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Shapeways is getting very tight on the minimum size rule. I had some models that printed fine previously they will not print anymore- back to the CAD program.

I pointed out my "wire" was square and that the area of the cross section was the same as a round wire, but no good. It was a small scale chair leg. So I redesigned my chair with round legs. Now I'll see if some other part of the design fails.

Getting a bit off topic- sorry.

 
   
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