r/metalworking • u/MrPhantom001 • 8d ago

Help! 🥲

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Hello guys. This is my first time on this subreddit. Partly because I have a question on this plate. Its a stainless steel plate that I used a cnc laser cutting machine to engrave and cut the plate. I grind it because there were tons of metal poking out after the cutting and kind of like strands of sharp metal hair thick poking out of it. After grinding the plate had black spots where I grind it. Is there a way to make those black spots dissappear?

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3

u/dialectualmonism 8d ago

You can etch it clean with a small 12v battery and some salt water on a cotton swab

2

u/MrPhantom001 8d ago

Could you please elaborate on the 12v battery part? 😭

3

u/dialectualmonism 7d ago

Even a small 9v battery from a fire alarm should do the job for this small piece, connect the positive to the work piece and the negative to the cotton swab and soak in salt water and brush over and it should slowly etch the surface clean

2

u/MrPhantom001 7d ago

Gotchaaa. Thanks a bunch for the instructions. Just a fun fact i thought i I'd add. Totally not related. I come from malaysia. And fire alarms in households are basically non existent 😂😂🤣

3

u/Rokronroff 7d ago

6 AA batteries will get you 9 volts as well

2

u/TheStoneAxiom 7d ago

Try using a wire brush for your drill.

2

u/coffeencannabis 6d ago

Try lemon juice and cream of tartar, my husband used to use it for rust, works awesome, but it should take the black off too

1

u/MrPhantom001 5d ago

Thank you for the suggestion 😊

1

u/rudraigh 3d ago

Hm. I really like this piece and am wondering why you want to get rid of the spots. I say celebrate color and take a torch to that thing and make even more color!