chassroc
Cave Dweller 
Rocks are abundant when you have rocktumblinghobby pals
Member since January 2005
Posts: 3,586
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Post by chassroc on Oct 2, 2006 14:07:56 GMT -5
I have been using a gravity drip system on my 6 inch wheels but I have another system that uses a sump pump submerged in water but elevated about 6 inches above the bottom of the well to recirculate water. This gives me increased wetting of the grinding wheels.
I never thought about cross contamination (I'm grinding with 10 inch SC wheels). I just assumed the grit would settle to the bottom or bounce off the wheels. Am I downplaying the potential for damage?
csroc
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Post by stoner on Oct 2, 2006 14:15:31 GMT -5
Hey Chasroc, Bill just posted a similar question. I use a drip feed on my grinder and I like the fact that I've always got clean water on my wheels at all times. To be honest, I don't think it would make much difference until you got to the 1200 stage. There and after that stage I think spraying the wheels with gritty water would cause problems geting a stone to take a polish. Could you put the sump pump in a bucket of clean water?
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Post by gemkoi on Oct 2, 2006 14:24:21 GMT -5
Yup, Ed right. The main concern is after the sanding, when your start up on prepolishing.
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Post by rocklicker on Oct 2, 2006 16:29:37 GMT -5
I use a pump with a two bucket system and I just dump the drain bucket back into the feed bucket every now and then. I never thought about cross contamination, but then the drain bucket has lots of time to settle. I also change the water every week or so. I've never had a problem so far. I use diamond wheels which don't shed much. I would think SiC would be anither story. Maybe if it has time to settle it would be OK, or use a two-bucket system (drains into a seperate one) and don't reuse the drain bucket.
Steve
Steve
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rallyrocks
fully equipped rock polisher
Member since November 2005
Posts: 1,507
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Post by rallyrocks on Oct 2, 2006 18:47:37 GMT -5
I always use fresh water after making the mistake of recycling once, it might not be a problem for the coarser grinds, but once you are at even 600, well I had all kinds of problems eliminating scratches because of larger particles coming in through the water.
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stefan
Cave Dweller
Member since January 2005
Posts: 14,113
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Post by stefan on Oct 3, 2006 12:14:37 GMT -5
IN the course grind it is not as much of a problem- But get a little "gritty" water into a leather belt- and then try to polish- I use a drip system for just that reason- as long as you are carefu with a sump system (clean water at every stage) there should not be too many problems
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