I know there has been a lot of talk on this forum about removing Mill-scale, but never paid much attention to them because most involved using some sort of acid. I subscribe to the Homemadetool.net and get a posting from them daily. I usually look down through the items and without too much time spent, I then delete the post. But this morning there was a couple posts that caught my eye, I watched a video on Removing Mill-scale, and found in not all that hard to remove. Here is a link to the video.https://www.homemadetools.net/forum/...medium=email&a mp;utm_campaign=02-22-21&utm_content=02-22-21-175904&fi=175904#post175904 Just thought you all might like to see it.
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"swiss-mill-scale" must be tougher. i tried all acids with no luck, even when hot. so last time i figured if molasses remove rust and rust is oxide and scale is oxide, well, that molasses might remove mill-scale. after 10 days at 40°c in 15% molasses the part came out worse than before. back to the grinder.
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I found a different way last summer. I have a 2x72" belt grinder for which I was lucky enough to buy an 8" contact wheel before the prices exploded. If you run a fairly coarse belt on such a contact wheel, you can draw the (flat) stock up and down the wheel smoothly and it removes the scale quickly leaving behind an attractive brushed finish. It builds heat but it removes the scale aggressively. This is a bladesmithing trick, and it works great if you have a belt grinder with a contact wheel.
Flap wheels really don't work well. Bench grinding wheels do not work well. Not for large flat areas. Of course, sandblasting works but that comes with its own set of challenges.
metalmagpie
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Originally posted by Illinoyance View PostI don't have running water in my shop and I don't want acid fumes rusting my machines and tools so I will not consider pickling for scale removal. An oxy-acy flame works great for popping scale.
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Originally posted by SLK001 View Post
That's what the outdoors and garden hoses are for. I would NEVER do this inside my shop._____________________________________________
I would rather have tools that I never use, than not have a tool I need.
Oregon Coast
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Originally posted by lugnut View Post
What the hell would you do if you lived in a area where the humidity averages over 90%, like it is where I live?
If anything is left to air-dry here in summer, it will rust before it dries, even in the sun. The hair dryer works.2801 3147 6749 8779 4900 4900 4900
Keep eye on ball.
Hashim Khan
It's just a box of rain, I don't know who put it there.
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I've been fabricating with A36 hot rolled for most of my life, professionally. I use a type 27 depressed center grinding wheel such as this:
https://www.amazon.com/United-Abrasi.../dp/B003UYUR56
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Originally posted by nickel-city-fab View PostI've been fabricating with A36 hot rolled for most of my life, professionally. I use a type 27 depressed center grinding wheel such as this:
https://www.amazon.com/United-Abrasi.../dp/B003UYUR56
Watch out for that 36 grit. It will eat everything, even on a 4" grinder. JR
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Originally posted by dian View Postis the designation correct? nothing comes up in 3 search engines.
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Why so concerned about mill scale ???
When I turn or mill something, the mill scale comes off,
so ? ? ? ?
If it is not being machined, and I am going to paint something,
I just use a wire wheel on a grinder to clean any rust off
then paint it.
I have never in my life wanted to remove mill scale before I
began machining something or really, paint something.
unless it was also rusty.
So please explain to me why you want to get rid of it ?
-DoozerDZER
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