Anodizing dimensional changes? - Plating Powder Coating Buffing Anodizing

desert_roamer · #1 (**permalink**) 01-31-2002, 12:05 AM

If anodizing grows a thickness of say 0.001 does that mean 0.001 is added to the dimension of the part or is some of that anodizing layer grown under the original machined dimension?

Thanks.

mcaswell · #2 (**permalink**) 01-31-2002, 07:45 AM

It's added on top of the aluminum.

PRD#5 · #3 (**permalink**) 02-08-2002, 05:28 PM

Actually, it's 1/2 build-up, 1/2 penetration.
Example: .001 plating thickness adds .0005 to the surface. It would add .0005 to each side of a hole making it .001 smaller. On threads it's 4:1 due to the thread angle. So, .001 thickness would yeild .0005 per surface x 4 = .002 on diameter.

Hope this helps,
Don

desert_roamer · #4 (**permalink**) 02-11-2002, 12:06 PM

Quote:

PRD#5 wrote:
Actually, it's 1/2 build-up, 1/2 penetration.
Example: .001 plating thickness adds .0005 to the surface. It would add .0005 to each side of a hole making it .001 smaller. On threads it's 4:1 due to the thread angle. So, .001 thickness would yeild .0005 per surface x 4 = .002 on diameter.

Hope this helps,
Don

Thanks, it does. I was trying to figure out if I need to ream close fit holes over size prior to anodizing. I decided to go 0.001 O/S and will try to get a 0.001 anodize thickness.

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