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Anodizing dimensional changes?

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  • Anodizing dimensional changes?

    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.

  • #2
    Re: Anodizing dimensional changes?

    It's added on top of the aluminum.
    --
    Mike Caswell
    Caswell Inc
    http://www.caswellplating.com
    Need Support? Visit our online support section at http://support.caswellplating.com

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    • #3
      Re: Anodizing dimensional changes?

      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

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      • #4
        Re: Re: Anodizing dimensional changes?

        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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