robbiejohn
starting to shine!
Member since July 2010
Posts: 36
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Post by robbiejohn on Aug 25, 2010 21:27:59 GMT -5
Hi all, sorry I don't have photo capability yet. Coming soon. I've managed to produce three batches of various stones. Most are beach stones which were carefully chosen, and I've been blown away. I thought it would take many more tries to get such a great shine. Each batch has been an improvement. I'm trying to be careful about carry-over of grit etc and have a separate barrel for polishing. Now that the latest batch is so bright, I've realized that the first 2 lots had a few softer stones in with them and this kept them from getting the very best shine on the harder stones. Anyway, what I want to do is choose the best of the first two batches and re-polish them. They certainly don't need to go back to 60/90 in the 33B. I'd like to know what grit or polish to go back to in the lotto. I have used 220, 400, 600, pre-polish and polish. I'm sure some of the 'old timer' tumblers have run into this before. I'd really appreciate the benefit of your experience. Thanks in advance, Robbiejohn.
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revco
starting to spend too much on rocks
Another Victim Of The Rockcycle
Member since February 2010
Posts: 162
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Post by revco on Aug 25, 2010 22:10:04 GMT -5
Well, since you've all ready run them up to the polish stage, they're pretty smooth as is. I would probably burnish them and just put 'em all back into polish to run them another week or two. If you want to play it safe, you might consider pre-polish and then polish, but my bet is that you'd be safe with just polish.
You mention that you run 600 and pre-polish. Grit around 500 is typically considered a pre-polish, so I'm curious what you're using as the pre-polish? If you're running typical 500 pre-polish, it's redundant to the 600 grit.
Glad you're getting it down! Tumbling sure is a lot of fun. It took me quite a few go's to try and learn this stuff...I sure wish that I had RTH way back when I got my first tumbler!
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