Gallery, Projects and General > How do I??

Machining tolerance when anodizing aluminum

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WeldingRod:
Hard anodize shouldn't be especially expensive, and its -definitely- what you want for abrasion resistance!
Yes, the part ends up growing overall.  I have data at work if needed.  Converting Al to AL oxide in a columnar form.

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philf:
You can always plug the tapped holes with a nylon screw.

Mike K:

--- Quote from: philf on November 03, 2021, 05:02:26 AM ---You can always plug the tapped holes with a nylon screw.

--- End quote ---

Nope, not nylon.  Not compatible with 15% sulfuric acid.

philf:

--- Quote from: Mike K on November 03, 2021, 08:58:54 AM ---
--- Quote from: philf on November 03, 2021, 05:02:26 AM ---You can always plug the tapped holes with a nylon screw.

--- End quote ---

Nope, not nylon.  Not compatible with 15% sulfuric acid.

--- End quote ---

Not even for the time it would take for the anodising? Wrap them in PTFE tape. I used to have a collection of polypropylene screws but I suspect I left them at work when I retired.

Many years ago I had some parts hard anodised and had to buy tungsten carbide taps to open out the threads again.

Phil.

WeldingRod:
Looks like 10 to 25 microns growth for colored anodizing.  20 to 70 microns for hard anodize. 
You are converting an equal thickness of the part into twice as thick oxide layer.  So, if you strip it off, the part shrinks twice the numbers above.

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