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Post by MrP on Oct 15, 2017 7:05:15 GMT -5
I have had that with a couple of my bowls but not anymore. I coat my bowls with thin superglue. In one of my first loads in the UV-18 I put to large of a rock in and it got caught and wore a thin spot in the bowl. Made me sick! I wasn't sure what to do but knew I had to do something so I tried to glue a piece of plastic into the spot. The plastic did not hold but the superglue looked good so I built up layers over time. Used the bowl for 3 years 24/7 for 220 sic grind. Over time I saw the whole bowl was wearing thin so decided to put superglue in the whole bowl. Do it outside because that much superglue gives off a lot of fumes. The bowl is still used for polish. I have coated all of my bowls...................................MrP Good advice MrP! Any particular super glue... or does it matter? Use a paint brush to apply it? gmitch067 Not sure it matters much for that. I found a large bottle of Hobbylinc super thin for a good price so that is what I used for coating the bowls. Just pour a bunch in and swirl it around until it is all coated. All it ends up being is a thin layer but it seems to last a long time. I only repeat for the barrels/bowls I use for Medium Sec grinding because Sic grit is sharp and stays sharp until very fine. Remember to do this where there is a lot of ventilation!
I don't know of anybody else doing this but superglue is a lot cheaper then new bowls and it has worked for me. Good Luck.........................MrP
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Oct 15, 2017 9:43:34 GMT -5
I don't understand.
How does the plastic sloughing effect the finish of the stones in any way at all? Isn't it simply a visible component of the slurry?
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Post by MrP on Oct 15, 2017 9:54:33 GMT -5
I don't understand. How does the plastic sloughing effect the finish of the stones in any way at all? Isn't it simply a visible component of the slurry? @shotgunner Plastic sloughing off has no effect on finish. By the time you get to polish there is almost no abrasion on the barrel/bowl. I use the superglue to extend the life of the barrel/bowl...................................MrP
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Post by MrP on Oct 15, 2017 10:41:34 GMT -5
I thought I would show you what happened and how I fixed my UV-18 bowl. Very soon after I got my UV-18 I put to large of a rock into it for the 1st stage. Having used a Lot-O for years I found that if it fit through the top of the Lot-O you could work with it. Course grit can be used in a Lot-O as well because it is a rubber barrel/bowl. By mistake I put course grit in the UV-18 and thought what the heck, can't hurt for one run. Well that was the run I put an oversize rock in. I watched and made sure the rock would roll around without any problem, it did, until I put the cover on! For some reason I didn't check it for 24 hours. Of course when I took the lid off everything started moving, because it was caught between the lid and bottom. I was happy to see everything moving and thought wow I sure can tumble big rocks in this one. Imagine my disappointment when I cleaned the bowl and found the divot in the bottom. When I held it up to light I could see light through the divot.
To repair I tried to super glue a piece of plastic I shaped to fill the divot. The glue stayed but the plastic would not. I ended up just using superglue to fill the divot and it held so that is when I decided to coat the entire bowl with superglue. As you can see the bowl has worn thin. I just use it for polish now. I will also tell you that when a UV-45 gets to this stage it cannot be used because the weight of the rocks makes it sag!
Light showing through bowl after about 4-5 years use.
Close up. The spot where the patch is was almost that thin 4-5 years ago when the mistake/divot was made.
Worked/works for me. Good Luck..........................MrP
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Post by gmitch067 on Oct 15, 2017 15:55:22 GMT -5
I don't understand. How does the plastic sloughing effect the finish of the stones in any way at all? Isn't it simply a visible component of the slurry? An interesting question Shotgunner... It is one of my original questions in this thread... and I would agree with you. However... I was alarmed that the plastic gravitated so readily to the pours of the Picture Jasper and adhered so tightly... enough so that I was concerned that their presence would prevent the polish getting down to the stone below. As the polish progressed through the days, I kept an eye on those stones and noted that attraction increase. At the end of the polish stage, a thorough washing with a garden hose (with a spray nozzle - first with a gentle spray, and then on heavy stream) did little to loosen them. In other loads, done in both UV-10 and UV-18, I also noted the accumulation of the black plastic shavings, but they just floated within the slurry and were easily cleaned out with a light rinsing of the garden hose (as you said "...a visible component of the slurry").
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Post by gmitch067 on Oct 15, 2017 16:13:18 GMT -5
At the end of the SiC 1200 grit stage, the Picture Jaspers were easily cleaned using water and soft bristle tooth brush - about as nice as shown in the post polish burnishing picture. That is how they entered the Tin Oxide polish stage (using my dedicated polish bowl). There must have been some abrasion to have created so much debris in the polish stage. Ooops... We are now back on the rock measles topic... Sorry! LOL! Glenn P.S. Thanks MrP! I am going to go out and get some more CA glue to coat both of my UltraVibe polish barrels.
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Sabre52
Cave Dweller
Me and my gal, Rosie
Member since August 2005
Posts: 20,455
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Post by Sabre52 on Oct 15, 2017 19:07:49 GMT -5
If you do much fine grinding in a UV-10 bowl you will cut through the bowl bottom edges fairly fast. I never did coarse grind in the vibe. Those black shaving are your bowl being ground away. As some have stated, fresh ceramic will make the situation worse. That "picture jasper" does look more like the picture or scenic sandstone out of Utah. Can't remember for sure where it's from. African Queen/Kalihari Pictuure jasper looks similar but is harder and has finer grain but does not go past a satin finish in the tumble....Mel
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Post by gmitch067 on Oct 16, 2017 16:58:22 GMT -5
I think I have figured out why my UV-10 and UV-18 loads are so heavily infested with black specks. Most of them (not all) are probably not plastic bowl fragments at all… More likely they are fragments from the soft foam rubber gasket material that I have been using between the bowl and the lid – to dampen noise and aid in clean-up. My own modification caused the problem!
Details:
I lined up my 2 UV-10 bowls and 2 UV-18 bowls across a work table in preparation to coat the inside of each with Starbond Medium Thick CA glue (one small bottle covered the insides of all 4 bowls. At least THAT went well). So I would not get the lids and gaskets mixed up, I placed each set beside their respective bowl. It was then that I noticed how worn and cracked each gasket was on their inner surface. I ran my finger nail across the surfaces and dislodged numerous small pieces of dried out rubber.
The center holes of each gasket were also heavily worn – especially the UV-10 gaskets. Because the UV-10 has less free space between the top of the center cone and the lid, the inside wing-nut was making contact with the gasket material – shredding the area around the center shaft hole… More black specks…
Both regular grit and “polish only” UV-18 bowls also showed signs of rocks and ceramics hitting the underside of their gaskets toward the outer edges. I fill each load almost to the top of the center cone, and have noted the normal cyclonic action causes the load to mound up at that location causing more wear... More black specks...
Note: Both UV-10 gaskets did NOT show contact between the rocks and the underside of the gasket (more free space between the center cone and lid).
I removed all of the soft foam rubber gaskets… and would recommend UV-10 and UV-18 users to steer clear of that type of gasket material in the future. Better yet, just leave the top lid as is. .. No Mods.
Glenn
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Post by gmitch067 on Nov 19, 2017 18:36:40 GMT -5
In conclusion...
I coated both my UV-10 and UV-18 bowls with Starbond epoxy (actually 4 bowls... both vibs had a regular grit bowl and a polish only bowl). There was some wear to the epoxy during use, and a few flecks of shredded epoxy were found during the between stage rinse, but no black flecks infested any of the load stages through the polish stage. I have completed 2 full runs so far without incident.
I made two modifications to the UV-18 polish only bowl though (I couldn't leave well enough alone - could I?)...
1. Instead of the foam rubber sheet between the bowl rim and the lid, I changed the material to a 1/16 inch hard rubber material. The rubber coating under the lid - laid down by the manufacturer - was pulling away from the lid's edge, and I needed to either replace the lid or use the rubber gasket material. It has worked fine so far.
2. (not related to black shavings.) I have been plagued by small ceramics creeping up the insides of the bowls during vibe tumble (both UV-10 and UV-18). They usually created a mess across the inside of the lids and many times prevented me from getting a good seal after checking the loads. Sooo... I super glued a rubber bumper around the inside lip of the polish only bowl. The rubber tubing I used is the same used to keep screens secured in the window or door frames. Because the tubing has ribs running the length, I could not ensure all coarse grits could be thoroughly cleaned out to prevent cross contamination with the next load... so this mod was only made to the UV-18's polish only bowl. Results: Success! No more small ceramics get past the barrier to make a mess on the underside of the lid or table top! Yippiiii!
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JR8675309
freely admits to licking rocks
Member since August 2019
Posts: 751
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Post by JR8675309 on Feb 16, 2020 9:13:34 GMT -5
I have had that with a couple of my bowls but not anymore. I coat my bowls with thin superglue. In one of my first loads in the UV-18 I put to large of a rock in and it got caught and wore a thin spot in the bowl. Made me sick! I wasn't sure what to do but knew I had to do something so I tried to glue a piece of plastic into the spot. The plastic did not hold but the superglue looked good so I built up layers over time. Used the bowl for 3 years 24/7 for 220 sic grind. Over time I saw the whole bowl was wearing thin so decided to put superglue in the whole bowl. Do it outside because that much superglue gives off a lot of fumes. The bowl is still used for polish. I have coated all of my bowls...................................MrP Great idea. Is MrP still following this thread? I’m curious how you coated the bowl with superglue
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Post by MrP on Feb 16, 2020 12:27:14 GMT -5
Is MrP still following this thread? I’m curious how you coated the bowl with superglue Just happened to see this. Do this outside and keep downwind. There are lots of fumes doing it this way. I pore part of a bottle of thin Super Glue into the bowl and keep moving the bowl around until you see the whole inside is coated. If you use too much it may want to settle to the bottom when it is set down but that doesn't seem to matter. The coating doesn't last forever but I found it made a big difference for me. Good Luck.............MrP
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JR8675309
freely admits to licking rocks
Member since August 2019
Posts: 751
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Post by JR8675309 on Feb 16, 2020 17:40:32 GMT -5
Thanks for the info!
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