butcha
off to a rocking start
Member since January 2016
Posts: 21
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Post by butcha on Jun 26, 2016 13:23:19 GMT -5
I've just finished a 800 sc grind on a mix of phiroza agate and unakite, the grind ran for approximately 10 days and most stones are ready for polishing (going to run them in 1200 sc to ensure a good polish) however i had to discard several stones as they had developed several cracks on the surface
I've been rock tumbling for a couple of years and not had this problem before, any ideas/thoughts on what may have caused it so I can avoid it again?
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The Dad_Ohs
fully equipped rock polisher
Take me to your Labradorite!!
Member since September 2012
Posts: 1,860
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Post by The Dad_Ohs on Jul 12, 2016 13:55:00 GMT -5
while it is possible that the tumbling action created some cracking, usually with softer stones mixed with harder, I would say that the grinding action probably exposed the cracks already within he rock but unseen till now, you can grind away the cracks and retumble in the next batch or leave them for a long tumble in another batch, or.... garden rock !!! LOL
good luck
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