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Post by Rockindad on Nov 7, 2021 18:28:52 GMT -5
"I also noticed a lot of leftover grit this time, more than normal."
It's likely as simple as this. Whenever you have larger leftover particles of SiC you are going to have a rougher surface. Like the difference between sanding a piece of wood with 60 grit sandpaper or 200 grit.
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Tommy
Administrator
Member since January 2013
Posts: 12,884
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Post by Tommy on Nov 7, 2021 22:05:55 GMT -5
"I also noticed a lot of leftover grit this time, more than normal." It's likely as simple as this. Whenever you have larger leftover particles of SiC you are going to have a rougher surface. Like the difference between sanding a piece of wood with 60 grit sandpaper or 200 grit. Looks like the OP deleted the opening post for this thread.
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Post by Rockindad on Nov 8, 2021 6:27:02 GMT -5
"I also noticed a lot of leftover grit this time, more than normal." It's likely as simple as this. Whenever you have larger leftover particles of SiC you are going to have a rougher surface. Like the difference between sanding a piece of wood with 60 grit sandpaper or 200 grit. Looks like the OP deleted the opening post for this thread. That's too bad as it could have helped people new to the hobby. It seemed to be a classic case of information overload- there are so many variables that you can point the finger at when things do not go as expected it is easy to overlook the most likely culprit.
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dshanpnw
fully equipped rock polisher
Member since December 2020
Posts: 1,071
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Post by dshanpnw on Nov 13, 2021 9:01:37 GMT -5
I would like to have read the first posting, so without seeing it I will offer my observations about rocks going from smooth to rough while in the coarse grit stage. I have noticed this happening so I move the rocks to the 220 stage and they smoothed out quite nicely. Hopefully I'm following along with the original post.
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Post by Rockindad on Nov 13, 2021 9:22:14 GMT -5
I would like to have read the first posting, so without seeing it I will offer my observations about rocks going from smooth to rough while in the coarse grit stage. I have noticed this happening so I move the rocks to the 220 stage and they smoothed out quite nicely. Hopefully I'm following along with the original post. Here is the gist of it, the part I chose to focus on anyway: -Running a batch of rocks, upon cleanout the OP notices that the surface of the rocks is relatively smooth, great! Put back in barrels to run for another cycle. -At next cleanout notice that the surface of the rocks have taken a step back, disappointing. The OP listed many possibilities/questions of what may have caused this. Among those the OP noted that they had "a lot of leftover grit this time, more than normal." -The observation was just that the grit during the first cleanout (lets assume they were using 60/90SiC) was likely broken down to 400-500+/-. The next cleanout had a lot of grit leftover, perhaps the average size of this grit was only 200-300+/- resulting in the surface being rougher even though the rocks had run an additional cycle.
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