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Post by mysticalcrystal on Apr 1, 2024 22:48:57 GMT -5
Hi I'm pretty new at tumbling and have been reading up on using corn cob for polishing stones that are 4 on mohs scale. When I was trying to locate corn cob for tumbling says grit is 20/40 grit. Thoughts on using corn cob for dry polishing or green epoxy media?
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khara
fully equipped rock polisher
Member since September 2022
Posts: 1,979
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Post by khara on Apr 1, 2024 23:45:49 GMT -5
Welcome! I haven’t done much tumbling lately and never used the corn cob but someone here oughta chime in. rockjunquie Can you help put this in the tumbling thread so some more tumblers see this? |
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Post by vegasjames on Apr 2, 2024 3:04:55 GMT -5
Welcome from Southern Nevada.
I have tried the corn cob method in a vibe tumbler. I got the crushed corn cob from a feed store and added some polish. Cannot tell you how it worked though as the cabachons I was polishing are still in the vibe covered with corn cob and polish dust. I did not take them out and clean them. The crushed corn cob was not very expensive though, but does come in 50 pound bags.
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Post by chris1956 on Apr 2, 2024 7:26:39 GMT -5
Welcome from Missouri. They might be a little harder than 4 but here is a link to a Michigan Rocks Jugglerguy video on using corncob media to polish Petoskey Stones. You might also do a search on the forum. I think there have been other threads about using corncob media. I haven't done it yet myself. |
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Post by mysticalcrystal on Apr 2, 2024 21:50:17 GMT -5
I'm tumbling purpurite with some florite. I decided after some research to start with medium grit. It been about 9 hrs and they are starting to round nicely. I haven’t decided yet of im going to use corn cobs or just regular polish at end. Any suggestions?
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titaniumkid
spending too much on rocks
Member since June 2023
Posts: 499
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Post by titaniumkid on Apr 3, 2024 3:55:02 GMT -5
These videos might be helpful too. The fluorite undergoes a final polish in corn cob.
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Wooferhound
Cave Dweller 
Lortone QT66 and 3A
Member since December 2016
Posts: 1,432 
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Post by Wooferhound on Apr 3, 2024 15:18:40 GMT -5
You may also try Walnut Shells or Volcanic Pumice for tumbling Soft stones
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hplcman
spending too much on rocks
Looking forward to my Friday Night Barrel Clean out!
Member since August 2022
Posts: 493
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Post by hplcman on Apr 3, 2024 16:28:44 GMT -5
Hi I'm pretty new at tumbling and have been reading up on using corn cob for polishing stones that are 4 on mohs scale. When I was trying to locate corn cob for tumbling says grit is 20/40 grit. Thoughts on using corn cob for dry polishing or green epoxy media? And in this case, I think the reference to 20/40 grit corn cob media just means that's the size of the corn cob particles, not anything to do with the hardness of the corn cobb. |
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