snivlem
starting to spend too much on rocks
Member since February 2008
Posts: 167
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Post by snivlem on May 8, 2008 21:13:49 GMT -5
Anyone here ever tumbled these to a shine? I have a bunch, and I cabbed a couple, but no shine in the vibe! They seem hard enough, but they might not shine up for me. (Petoskey stones are fossilized coral from Michigan, I believe) They look similar to a dino bone.
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Post by deb193redux on May 8, 2008 22:37:47 GMT -5
Nobody ever has. Many conversations about this. Buff on a wheel with ZAM. -- But, recent good results with corn cob on Piccaso Jasper makes me wonder.
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Post by connrock on May 9, 2008 13:45:49 GMT -5
I've never tried this but you may be a first!
How to tumble Petosky Stones
Step 1: Start with 320 or 500 & finer silicon carbide grit, using a
thickening or suspending agent like syrup, sugar, or molasses for
cushioning.
Step 2: Use 600 or 800 & finer silicon carbide grit with a ratio of 1 to 1 or
2 to 1 of media to Petoskey stones. Use plastic pellets or coarse-ground
walnut shell for media. You may also need to use a thickening agent like
syrup, molasses, or sugar (being careful not to thicken load excessively).
If you use 600 silicon carbide grit, follow with 600 aluminum oxide as a
pre-polish, jumping to the final polishing stage.
Final Step: Use cerium oxide or 0.5 to 0.8 micron aluminum oxide polish,
cushioning with fine-ground walnut shell and a thickening agent like
syrup, molasses, or sugar, but do not thicken load excessively.
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snivlem
starting to spend too much on rocks
Member since February 2008
Posts: 167
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Post by snivlem on May 10, 2008 1:53:55 GMT -5
holy wow! I am still a novice, so the Petoskeys will go in to the "to be addressed later" file!
thanks deb and con, you are both very helpful!
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Post by connrock on May 10, 2008 5:28:13 GMT -5
I did tumble some back about a year or so ago but not using this recipe.They came out OK but I had to finish them up on a buffing pad using Zam.
I didn't want to use this recipe due to all the gooey stuff in it.
connrock
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