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Old 04-06-2006, 07:12 PM   #1 (permalink)
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anodizing barrels

When you anodize, it leaves kind of a rough surface right? So when you do a barrel do you have to repolish the inside of the barrel? Is doing that going to increase the bore appreciably?

It seems when barrel kits have sizers as close as 2-3 thousandths of an inch you might start to see problems anodizing barrels, plus if you don't have the right hones you are going to end up with a rough bore.

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Old 04-06-2006, 11:08 PM   #2 (permalink)
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Often you can use some variety of filler to plug the barrel, preventing the inside of the barrel itself from being annodized.

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Old 04-07-2006, 01:55 AM   #3 (permalink)
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Anno finish depends on the surface it is going on; if it is polished it will come out smooth and polished, if it is a textured surface it will come out textured.
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Old 04-07-2006, 11:59 AM   #4 (permalink)
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The acid that removes the old anno is what roughs the surface. You could plug the inside and only remove the outer surface then anodize the whole thing.

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Old 04-07-2006, 01:27 PM   #5 (permalink)
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I'm wondering what those who do ano (rainman et al) do when they do a marker.

I've got a dye ultralight I'd like to get re-ano'd, but that's a lot of little holes to plug!
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Old 04-07-2006, 01:54 PM   #6 (permalink)
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Rainman does'nt plug anything.

Brinstar just got his Epic done by Rainman...his Bigshot is actually needing a polish on the inside. I was actually discusted by this. The bore actually looks like it was bead blasted from the etching solution(acid) used to strip the old anno.

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Old 04-07-2006, 11:18 PM   #7 (permalink)
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Anno--if stripped correctly will not leave a rough, pitted surface, the stripper used was either to hot, or to strong, or left to long. I strip stuff and with a very minor polish its good to go.

That being said, you really do need to polish the item, anno forms not only on the surface, but 1/2 of it is in/below the surface of the aluminum. So simply striping and then trying to reanno wont give you really optimum results.(anno layer is .001, but only .0005 is above surface)

I just did fox's barrel front and the bore of it is fine and slick.
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Old 04-09-2006, 12:20 AM   #8 (permalink)
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So the aluminum hydrate layer is .001...

Strip a .688 barrel, goes up to .690 (.001*2), then ano (half into, half above) brings it back to .689? Or will you just lose that extra .001 of diameter in polishing?
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Old 04-21-2006, 09:53 PM   #9 (permalink)
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Polishing shouldnt take off .001 unless you go back to some very course abrasives. and your over doing the math, just think that .0005 comes off, and then is grown back.

Most anno done on paintball items is a decortive Type 2 anno and I think is relatively thin (.0005) .

Type 2 can be grown to about .001 or the dissolution point, (dissolution point-where its being eaten off by the acid as fast as its grown, that is were you start to see pits in the aluminum). But I dont think all items in paintball get this thick of a layer

To get thicker layers you need to do Type 3 anno which requires very cold acid (50 degrees) and lots of current (twice as much), type 3 doesnt accept dye very well but its a thick hard surface. But we like color and smooth surfaces so we do type 2!

I hope that helps,

Last edited by marc; 04-21-2006 at 10:05 PM.
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Old 04-21-2006, 11:17 PM   #10 (permalink)
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Rainman did a CP barrel for me and it came out looking pretty darned flawless, bore and all.

I don't know what the difference might have been. I understand that anodizing is nearly as much art as science.
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