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PostPosted: Mon Apr 01, 2013 9:07 pm 
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This is a fill plug made for QB 78 hpa. The cap was anodized black but turned out to have a purple tint. Still more to learn about anodizing. The end cap is to protect the fill nipple and screws on...not just an o-ring fit. The steel is 1018 steel and has double the amount of threads as a regular disco fill plug.


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PostPosted: Mon Apr 01, 2013 9:51 pm 
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How are you planning to retain it?

QB78 uses an external thread on the tube...as I recall.

Curious is all. :)

Al


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PostPosted: Mon Apr 01, 2013 10:07 pm 
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It has threads that go internally into a chrome moly tube for high pressure air. The two grooves that you see in the picture are for the orings to prevent air from escaping from the tube. The fill pressure for the tube is 3200 psi.


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PostPosted: Mon Apr 01, 2013 10:22 pm 
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This is with the end cap screwed on and remaining threads screw into chrome moly tube.


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PostPosted: Mon Apr 01, 2013 10:45 pm 
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Figured that was how the cap mounted, figured you had two o-ring grooves on it as well. :) (one is enough IMO...but it's yours, so do what makes you comfy. :wink: )

A pic of the tube along with the plug would be nice. :)

Regards,

Al


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PostPosted: Tue Apr 02, 2013 12:00 am 
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The pink... You current / process time or both were cut short. Looks to me that the part really didn't anodize, so it didn't take the dye. Your connection was good or the part would have burned.
I know you probably already know this, but watch the off gases. They are flammable...

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PostPosted: Tue Apr 02, 2013 6:54 am 
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Thanks for the advice. It actually is a nice purple/pinkish colour. I double dipped it into blue. I believe my cathode was undersized also. It was anodized for about 1 and 1/2 hours but looks like another half hour might of made a difference. I was trying for black but had read it was one of the harder colours to achieve. I then dipped it into blue which might of resulted in the funky colour. Thank you for your input as all insight is greatly appreciated.


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PostPosted: Tue Apr 02, 2013 7:59 am 
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Black is very easy to obtain... You need to pull more current, increase your surface area on the cathode or even better add more. Do you have a way of measuring current and controlling it? You are just breaking the surface, you need more penetration. More time would do it, but if you know the surface area of your parts and you can control voltage/current then you can complete any batch.

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PostPosted: Tue Apr 02, 2013 1:00 pm 
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I am using a 12 volt battery charger. No way of measuring. For now I have increased the cathode surface area.


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PostPosted: Tue Apr 02, 2013 7:18 pm 
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Ok... Be careful, your current can increase dramatically with temperature. If the tank heats up (and it always does), the current will increase and the cycle will continue.

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PostPosted: Wed Apr 03, 2013 4:57 pm 
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Did a sample piece, alot longer anodize. I believe my shop is also too cold for anodize bath. Cant wait till warmer weather gets here. The test sample came out black except the top where it didnt get the same amount of bath time(purple)


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PostPosted: Wed Apr 03, 2013 9:45 pm 
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There are some tell-tale signs when the part is done in the tank. The current will suddenly taper off and the fizzing/bubbles will do the same.
Time required in a cold tank will be noticeably longer.
Make sure all the off gases are vacating if you anodize inside.

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PostPosted: Thu Apr 04, 2013 4:19 pm 
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This is one is the raw both fill plug and cap.


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