I have a lot of bronze sand cast parts needing to be polished. I have sanded them smooth, and thought this would be an excuse to buy a vibratory polisher. I threw in a sample that I had already polished on one side so I could better see how much the abrasive was cutting. After 1.5 hours in 220 grit, there is no difference in either the sanded side or the polished side.


Do I need to let it go for many hours? Am I expecting too much? I thought this would make final polishing easier and also get into those cracks and crevices where it’s hard to reach. I wasn’t expecting to get them shiny- I was going to vibrate them through 1000 grit, then hand sand to 3200, then buff. My expectation was just to even out the scratch pattern a little more at each level of grit. I’m seeing nothing at all. I could go longer, but thought I would ask here because I thought after 1.5 hours there would be at least some difference.

Here is a similar unit to mine. I didn’t pay that much, but looks the same.

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