Anodized Thickness

[Larry1958]

I know this is not a MasterCam question, but figured with all the experience out here I could get a solid answer to this. I have a print that calls out for " MIL-8625F TYPE 2, CLASS 1 sulfuric acid anodize - clear" My question is "what can I expect for buildup". I have a chart and it states there is no build up for this call-out, but I am getting arguments from co-workers on it. Thanks in advance.

[Dave.L]

Larry,

 

I would contact your anodize supplier to be 100%. However, our supplier has told us .0001" penetrate and .0001" buildup. It will only be ZERO if they do a great job etching the part to make up the difference - don't count on that.

[Dave.L]

Larry, See the spec (I did not look thru it)

 

My link

[Larry1958]

Thanks Dave. From my experience there really should be no significant build-up on this but we have some really tight tolerances on the parts going out for Anondizing. I am going to hope for the best when they get back in-house. It sucks that you spend so much time and effort on machining and it can all go to crap when sending out to plating houses. Thanks again.

[Dave.L]

Larry,

 

Depending on your parts and your customer, you may be able to mask the tight tol. features. It's a very common practice even with non-hardcoat anodize.

[Mr. Wizzard]

Not sure what parts you have or the tolerances involved, but I used to have to finish grind parts to +-.0001 after anodizing. Usually just dusting some high spots off for squareness. Might be all you have to do.

[Fretless]

specify "no dimensional change" and hold them to it!

my 2 cents

[Dave.L]

specify "no dimensional change" and hold them to it!

my 2 cents

 

 

 

That's funny, good luck with that...

[Chris Rizzo]

specify "no dimensional change" and hold them to it

 

how many decimal places? Some anodizisers work with tape measures.

 

Only if all the stars align can even the best annodizer keep .0003 consistently, let alone day in and day out. I used to deal with a .0002 bore tol on a particular part.. Used about 5 different annoizers over 6 or 7 years. Finally gave up with that and since left .010 on the part, then machined after. Problem solved.