Originally posted by J Tiers
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Best way to remove black oxide skin from hot roll
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Originally posted by rogee07 View PostIve got some pieces of hot roll A36 that I will be using on a project, what would be the best way to remove the black oxide skin prior to machining? Or is it even worth worrying about. I have never worked with hot roll before, but have heard that the outer skin is tough on HSS end mills, however I don't know this from personal experience.
The CGW 4-1/2" disc in 40 grit will eat everything, including skin and clothes.
The lil cutoff wheel is good for tight spaces (on edge only).
That Hilti flaring cup is what I used on my thick welding table. Again, needs the power but will knock down scale on a flat surface easily. JR
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Originally posted by nickel-city-fab View Post
The SAIT link had these new ceramic ones, would that be cubitron? I have heard they exist but have not used them.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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Originally posted by tom_d View PostI treat mill scale the same as the surface of a sand casting. Whenever possible make the first cut deep enough to get completely under the scale. I've found the greatest tool wear comes from a light pass with the tool coming into and out of contact with an irregular surface. As long as the tip of the tool is under that scale just plow away. Normally I'm using HSS too, as I'm just taking the top layer off, even if there is some tool wear it's just a quick touch up on the grinder and then back to cutting. Quick and easy to touch up HSS.
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Unless you are under industrial or commercial requirements to descale, it seems to come down to how much fun you want to have preprocessing your A36 stock. Personally, for machining projects i will just cut away the scale rather than abrade it, for fabricated small projects, abrading is easy. For larger projects that will get painted or powder coated i prefer having it sandblasted. If i have lots of small components i pickle them in a vinegar and salt bath aided with a 12 volt power supply. My 2 cents.
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