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Post by broseph82 on Mar 20, 2020 9:54:17 GMT -5
.57/lb more. It would be great to get that shipped price on 30 grit. Who needs 80 when you can buy 30g for just a little more? Shipping is $50.24
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Post by HankRocks on Mar 20, 2020 10:24:16 GMT -5
KN has the 80 grit 45 lb for 76$ shipped Who needs 80 when you can buy 30g for just a little more? I use 80 in the Vib Lap as first stage. Anything coarse than that and the 220 has trouble removing all the deeper scratches from the flat surfaces. For tumbling I do use grits coarser than 80, the breakdown there is quicker Henry
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Post by broseph82 on Mar 20, 2020 11:34:32 GMT -5
Who needs 80 when you can buy 30g for just a little more? I use 80 in the Vib Lap as first stage. Anything coarse than that and the 220 has trouble removing all the deeper scratches from the flat surfaces. For tumbling I do use grits coarser than 80, the breakdown there is quicker Henry Correct. According to things I’ve read you shouldn’t even use 60/90 in Vibratory tumbler. Def need coarser grit when running big barrels 12lb and up with rotary. Once I’m done with my last little bit of 46/70 I have a 50lb bag of 30g I’m cracking open.
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Post by HankRocks on Mar 20, 2020 11:57:15 GMT -5
I use 80 in the Vib Lap as first stage. Anything coarse than that and the 220 has trouble removing all the deeper scratches from the flat surfaces. For tumbling I do use grits coarser than 80, the breakdown there is quicker Henry Correct. According to things I’ve read you shouldn’t even use 60/90 in Vibratory tumbler. Def need coarser grit when running big barrels 12lb and up with rotary. Once I’m done with my last little bit of 46/70 I have a 50lb bag of 30g I’m cracking open. My coarse tumbling is all in 15 pound rotary barrels so grit breakdown is no issue. The only exception to that is for loads of slabs and shaped preformed pendants, I will use 80 for the coarse. I have also used 80 for a load of Arkansas Quartz as it seems grit breakdown is slower.
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Post by Bob on May 26, 2021 17:10:43 GMT -5
For those of you in this thread who mentioned dealing with MLS, I was there today and sat down for an hour with the owner for good visit. He is perhaps the most knowledgeable rockhound and lapidarist I have ever met, and the store was possibly the best rock shop I've been in. He is currently experimenting with some very advanced approaches to using polyethylene concrete mixers for tumbling huge quantities.
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reeniebeany
starting to spend too much on rocks
Rotary Only
Member since January 2020
Posts: 125
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Post by reeniebeany on May 28, 2021 10:27:34 GMT -5
What would the advantage be of Poly over metal? Flexibility or give?
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Post by Bob on May 28, 2021 11:16:39 GMT -5
He is using ungraded 60-90 grit with very little water and has been able to increase efficiency such that 25% of material is ground away in first 24 hours. That stunned me. Next May, I will be spending more time with him and go see this part of his operations. I would imagine with that kind of grinding a metal surface would be penetrated quickly. He is using HDPE pieces inside the barrels which--so no adhesive exists that can adhere--have to be mechanically attached. The way he motioned with his hands as describing this is was almost like the protective tiles on the surfaces of the space shuttle. As a chem engr, he has advanced knowledge of the materials and some of the physics involved. I think he said these inside pieces were triangular.
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