Anodizing too thick
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Anodizing too thick
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Topic: Anodizing too thick (Read 406 times))
lennyk
Marksman
Posts: 381
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Real Name: Lennard
Anodizing too thick
«
on:
December 02, 2021, 10:18:25 PM »
How common is it for anodized items(thread items)to be oversized?
I recently got a drop block for a mrod bottle conversion which would not thread into the air tube.
I had to use easy off oven cleaner on the threads to remove the hard anodizing and like Magic it fits,
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Port of Spain, Trinidad
BigBird
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Posts: 1397
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Real Name: Dan
Re: Anodizing too thick
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Reply #1 on:
December 02, 2021, 10:33:17 PM »
I'd be careful. Oven cleaner dissolves aluminum. You don't know how much it dissolved or pitted the aluminum. Anodization is just part of the alloy (probably zinc) that comes to the surface. I'm not sure how thick it can get.
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USA, VA, Winchester
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lennyk
Marksman
Posts: 381
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Real Name: Lennard
Re: Anodizing too thick
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Reply #2 on:
December 03, 2021, 07:22:48 AM »
yes, I tested how much it would remove first
made sure to wash and neutralize with vinegar and wash again well
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Port of Spain, Trinidad
Madd Hatter
GTA Senior Contributor
Posts: 7359
Real Name: Robert
Re: Anodizing too thick
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Reply #3 on:
December 03, 2021, 01:05:12 PM »
Vinegar is a acid and so is the phosphoric or chromic acid. Use baking soda to nutrlize acid.
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Gippeto
Sharp Shooter
Posts: 864
Re: Anodizing too thick
«
Reply #4 on:
December 03, 2021, 01:50:52 PM »
Anodizing is a built up porous oxide layer, no zinc involved. As it builds on the surface of a part, it surely can affect close tolerance fits like threads.
Likely the drop block threads were on the edge of the larger tolerance and the tube on the edge of smaller tolerance (these are +/- after all) and the mix resulted in not enough clearance after anodizing. It's just something that can happen when parts from different manufacturers are used together...nobodys fault really.
Al
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Alberta, Canada
scoutscope
Shooter
Posts: 36
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Real Name: Lee
Re: Anodizing too thick
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Reply #5 on:
December 31, 2021, 07:26:32 PM »
A die might have been a better way to chase the threads. You should not have too though. Properly manufactured parts will fit together. If parts are within tolerance, they will mate. Think about it. If a part on the small end of tolerance won't fit a part on the big end of tolerance, what would be the point of engineering these numbers? Tolerances are called out for the reason of interchangeability. I can make a part to tolerance for anodizing, anodize, and if the part is within the final tolerance it will mate with the other part, assuming it is also to tolerance. If not, I would have to have the mating part to check the fit and machine one off parts for everything in this world. Things are not done like this anymore, at least not outside of basement machine shops. I personally take the time to find the tolerances in such references as Machinery's Handbook and work to them (in the basement shop). I know my parts will fit a properly made mating part without ever touching that part. All that aside, if a part you paid good money for doesn't want to mate up, consider speaking with the seller. You might find them willing to help.
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Cameron, MO, USA
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Anodizing too thick