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  • J Tiers
    replied
    Yes.... hydrochloric acid (aka "muriatic") is "shop death". It will cause rust all over the place if used or kept in or near the shop. Sulfuric is not nice stuff, but it is considerably less likely to corrode everything in sight.

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  • Rich Carlstedt
    replied
    I have heard to use Sulfuric Acid, not Hydrochloric
    Auto Parts stores may have some for battery use.
    Rich

    My File brushes are very fine bronze wire, but I also use Maple Wood shaped like a chisel . Any hard wood should work

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  • RMinMN
    replied
    Clean the files first. Any dirt or oils will deter the acid from doing its job. If the file have become clogged with material, us a hardwood block with a very sharp square corner to push along the file teeth and push out the material clogging them, then perhaps a wire brush or file card, then chemical cleaning using soap and an ultrasonic cleaner if available. Once the file is completely clean, then use an internet search to find how much of what acid for how long is needed.

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  • J Tiers
    replied
    Originally posted by rickyb View Post
    Forgot to mention that any acid eats sharp points faster than surfaces and will dull the file?
    Yet, the file sharpening services do use an acid treatment.

    The acid has no idea what part is thin or thick. What it does is eat inward on surfaces. A triangular shape like a file tooth will be eaten at from both sides. If the "point" is blunt, the action of the acid eating away the metal will tend to make another sharp point. Since the point has little surface area itself, it wont be eaten as effectively as the other surfaces.

    There are no doubt details that make all the difference. But the idea is sound.

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  • rickyb
    replied
    Forgot to mention that any acid eats sharp points faster than surfaces and will dull the file?

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  • rickyb
    replied
    Those files are hard to come by, so yes you want to save them. If they were mine I would clean them with a fine wire wheel. Wire size in the neighborhood of 0.007”. Brunch along the grooves of the files. We 40 will hold off the rust afterwards in a relatively dry shop.

    before the naysayers chirp in…The wires are softer than the file and won’t damage it. Especially if they are thin and compliant. I’ve been doing it for years on the same files with no issues.

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  • CPeter
    started a topic Renewing Files

    Renewing Files

    I acquired an older Milwaukee die filer (aren't they all older?) It came with a selection of files. They are dirty and have some rust. Can I soak them in something to clean and sharpen them, like say muriatic acid? BTW, the thing weighs 135 pounds!!

    Peter


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