Quoted from t2:Do you use the walnut shells to polish plastics or for metal only?
Ultrasonic cleaner for plastics.
For really tough metal jobs (rusted) I add in some granite dust. It cleans the parts and leaves a satin finish.
(Topic ID: 71115)
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Quoted from j_m_:- follow Triumvirat73's advice and purchase some flitz to toss in with the media
I have found that adding some mineral spirits in with the Flitz will prevent the parts from gumming up with dust and dirt deposits, maybe a tablespoon per load.
Quoted from jibmums:I have numerous metal posts/bolts/screws/etc. that have what I can only call a black "stain" in spots. Nothing I have tried - metal polish, steel wool, dremel wire brush - seems able to remove this. Have any of you encountered this, and were you able to remove it with a session in the tumbler?
Any pics?
Quoted from jibmums:Here's a pic, I circled the worst but you can see a lot of it spotting in other areas. The photo makes it look lighter, it's really more black than this. These are typical, I have numerous parts like this off the same machine. I assume it's some sort of oxidation but it's not rust as you can see some rust over on the left wireform bracket.
For that kind of rot, using granite dust will take care of it. Here is my approximate mix:
Hopper 1/2 full (3.5 qt. capacity) med. or course walnut shells
1/2 cup granite dust (found in the reptile section of a pet store)
Squirt of Flitz
Tablespoon of mineral sprits (the real stuff, petroleum based)
Let it run overnight and check. Add more granite if needed. Make sure the mix and parts are moving well. The dust is heavy, so too much of it or too much liquid will slow down the movement and nothing happens. Keep running it until cleaned up. This should leave a satin finish but no rust.
Quoted from jrivelli:Thanks for the tips there. I tumbled my stuff looking like that in coarse walnut with flitz overnight and was sorta shiny, but that stuff was still there mostly. Ill try what you said!
Also, can you tumble a final tumble with maybe fine walnut and flitz for a shinier polish?
Yeah, maybe. Just depends on the plating. If it's under the playfield the satin finish is fine. I do early SS restores and the mechs are almost always in horrible condition. I'm not doing high end restorations. I just want the stuff clean and functional.
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