Push Pull Ferrite Bass Planar magnetic speaker - Part 2 

Try electrolysis, where the anode is a damp cloth soaked in a conductive salt water and vinegar solution. Clip the other terminal (cathode) to the far end. It's the same technique use to etch metal. Welders sometimes use it to clean before and after welding. You can use a regulated power supply, an old phone charger, a 9v battery, etc. It doesn't take much current to work effectively. It should easily remove the surface layer contamination. Just don't stay in one place for too long. Wear a respirator, and use a fan... some metals release some really nasty gases or other byproducts. Never try it with anything galvanized or chromed.

Miss my Duetta Apogees👌👌

I use a bath of isopropyl alcohol to clean my grills before paint. I know they are like a cheese grater on the towel and like to shred everything

Nice ! Just a thought: The magnet forces may (?) make the grid form a tiny "pregnant belly" at the middle area. If so, what about stiffen the grid by crossbars ?

You’re just gonna have to spend some time finishing that steel step one I would be to chamfer all the holes, you could do this really quickly with just a hand drill. If you don’t have the bit, you could just use a large drillbit that would take away all the roughness around the holes next use a file on the edges then further process the plate with a sander degrease and paint would give you a nice finished product imo

wow thats a lot of magnets!

Best degreaser is brake cleaner first and finish with pharmaceutical grade acetone

Neos my guess is each magnet would probably be $100 +

why not use smaller neodymium magnets

21:18 🐈‍⬛ 🤮

Hey brother , use a soft copper hel ri with the brake parts cleaner , fast and easy