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Thickness gage for hard anodize

Thickness gage for hard anodize

Thickness gage for hard anodize

I am looking for a thickness gage to inspect hard anodize thickness on round parts. I have a .0006" tolerance on a bearing bore diameter after anodize. I inspect the parts prior to anodize in a tempeture controlled enviroment then outsource to a subcontractor for the process. I continue to have issues with holding the bore size to spec. The contractor claims that the bore size was out of spec prior to anodize when ever we have non-conforming product. Is there a gage accurate enough to verify this issue?
Thank you,

RE: Thickness gage for hard anodize

Do you feel confidence in your testing of the bore diameter before anodize and the process controls in place when the part is fabricated?  Yes there are gages accurate enough to measure the part but doing it up front is only part of your battle.

Holding such tolerances on an anodized part is notoriously difficult.  The etching portion of the procedure removes material and then the anodizing is supposed to build it back by a similar amoung.  Differences in bath quality, time, surface preparation, and raw stock quality all affect the result.

Does this feature need to be anodized or could it be added afterward?  Adding it afterward could save you a bunch of trouble.


RE: Thickness gage for hard anodize

What instrument are you using to measure the bore prior to the anodizing process?

What is the basic bore dimensions?

RE: Thickness gage for hard anodize

Anodizing involves the electrolytic oxidation of a surface to produce a tightly adherent oxide scale which is thicker than the naturally occurring film. I suggest your designers fix the thickness of the anodized layer they calculate to meet its service requirements, and machine the bore to give a slightly greater than finished size which will then be brought down to the required diameter by the anodizing process. Do not forget that whatever the thickness of the layer your plater/processor will produce, you will need to allow for double that as you will be dealing with a diameter (i.e two times radius.

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