lordsorril
freely admits to licking rocks
Member since April 2020
Posts: 866
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Post by lordsorril on Aug 27, 2020 12:15:33 GMT -5
Hi All, I checked my UV-18 this morning and I noticed bad action in the bowl. I took it off the stand and I saw that it was cracked and leaked into a muddy pool conveniently floating on top of the base. The entire bottom of the bowl feels thin and soft and I've noticed the action has been weird lately and the bowl itself seems to flex a little and wobble (broke a few threads on the center post in the process). I've been running it non-stop for a little over a year. I have already ordered a replacement bowl from Kingsley North and I got my UV45 up and running the other day...so no worries. I'm torn: Do you think I should bother trying to fix this bowl using superglue and epoxy resin, or would I be wasting my time against grit and rocks and should just wait for the replacement?
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Post by greig on Aug 27, 2020 12:26:38 GMT -5
Scrap it. I don't know of any repair material that you can trust to stand up the the action of the rocks.
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gatorflash1
spending too much on rocks
Active in Delaware Mineralogical Society, Cabchon Grinding and Polishing, 2 Thumlers B's and a UV-18
Member since October 2018
Posts: 375
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Post by gatorflash1 on Aug 28, 2020 7:20:21 GMT -5
Clean it real good and try some Gorilla Tape or Masking Tape and see if it will hold. Tape the inside and outside. Check frequently. www.gorillatough.com/
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Post by jasoninsd on Aug 28, 2020 8:15:26 GMT -5
Clean it real good and try some Gorilla Tape or Masking Tape and see if it will hold. Tape the inside and outside. Check frequently. www.gorillatough.com/I could very well be wrong, but I can't imagine this lasting more than a couple minutes...
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lordsorril
freely admits to licking rocks
Member since April 2020
Posts: 866
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Post by lordsorril on Aug 28, 2020 14:08:38 GMT -5
I was thinking about using Gorilla tape on the outside, sealing the crack with crazy glue, and then coating the inside of the bowl with epoxy resin. The bowl would then get relegated to 'polish-only' so that it would not experience as much wear and tear. However, the bowl seemed to vibrate weird on the vibe before it cracked--which suggests to me it was too thin/weak to keep going...I've read people repairing holes successfully, but, I suspect this one just might have reached the end of its durability...I don't know...
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Post by RickB on Aug 28, 2020 14:53:32 GMT -5
Looks to me that it has given all it could grinding and polishing rocks and deserves a final resting place in your back yard with an appropriate marker. Would also make a nice planter.
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Post by HankRocks on Aug 28, 2020 15:20:16 GMT -5
I was thinking about using Gorilla tape on the outside, sealing the crack with crazy glue, and then coating the inside of the bowl with epoxy resin. The bowl would then get relegated to 'polish-only' so that it would not experience as much wear and tear. However, the bowl seemed to vibrate weird on the vibe before it cracked--which suggests to me it was too thin/weak to keep going...I've read people repairing holes successfully, but, I suspect this one just might have reached the end of its durability...I don't know... You mention "vibrate weird" on the vibe. Have you checked the center bolt, it could be wearing out and getting loose and ready to break off. I have broken two of them so far. The 2nd time I replaced the bolt with a thicker one, 1/4" I think. It did require drilling out a slightly bigger hole in the plate below the bowl. It's held up so far but eventually it will break. I had the bowl break on mine, around the center post where the bolt and washer and wingnut tighten onto. Repair on that was fairly easy, epoxied a washer on the underside of the center post. I put about 3 layers of epoxy, That was over a year ago and it's held up. Mine is a Polish only unit, Rotaries do the heavy lifting. It would seem like it might be difficult for the epoxy to stay cemented to the inside. Only one way to find out. Good luck
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braat
spending too much on rocks
Member since December 2016
Posts: 350
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Post by braat on Aug 28, 2020 15:22:09 GMT -5
I was thinking about using Gorilla tape on the outside, sealing the crack with crazy glue, and then coating the inside of the bowl with epoxy resin. The bowl would then get relegated to 'polish-only' so that it would not experience as much wear and tear. However, the bowl seemed to vibrate weird on the vibe before it cracked--which suggests to me it was too thin/weak to keep going...I've read people repairing holes successfully, but, I suspect this one just might have reached the end of its durability...I don't know... try it...sounds to me about the best you could do and worst case you'll be where you are now and we'll all know for future (assuming you keep us advised)...
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pizzano
Cave Dweller
Member since February 2018
Posts: 1,390
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Post by pizzano on Aug 28, 2020 16:37:58 GMT -5
Scrap.......once they develop a seam........... expansion, contraction, weight, heat and motion will only expose the weakness more. Temporary glue fixes will wear just like a melting fusion epoxy will. IMHO, not worth the frustration and mess that comes with band-aids......if you tumble frequently.
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lordsorril
freely admits to licking rocks
Member since April 2020
Posts: 866
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Post by lordsorril on Aug 28, 2020 17:25:02 GMT -5
I was thinking about using Gorilla tape on the outside, sealing the crack with crazy glue, and then coating the inside of the bowl with epoxy resin. The bowl would then get relegated to 'polish-only' so that it would not experience as much wear and tear. However, the bowl seemed to vibrate weird on the vibe before it cracked--which suggests to me it was too thin/weak to keep going...I've read people repairing holes successfully, but, I suspect this one just might have reached the end of its durability...I don't know... You mention "vibrate weird" on the vibe. Have you checked the center bolt, it could be wearing out and getting loose and ready to break off. I have broken two of them so far. The 2nd time I replaced the bolt with a thicker one, 1/4" I think. It did require drilling out a slightly bigger hole in the plate below the bowl. It's held up so far but eventually it will break. I had the bowl break on mine, around the center post where the bolt and washer and wingnut tighten onto. Repair on that was fairly easy, epoxied a washer on the underside of the center post. I put about 3 layers of epoxy, That was over a year ago and it's held up. Mine is a Polish only unit, Rotaries do the heavy lifting. It would seem like it might be difficult for the epoxy to stay cemented to the inside. Only one way to find out. Good luck Thanks for the info! I just checked the center rod and it seems solid without any wiggle. I haven't tried taking apart my UV-18 yet so I prefer not to tear up the rubber base just yet to get to the bolts. The center post on mine is 3/8" default. What I find disturbing is that my UV-45 has the exact same width center post...would have hoped it would have been stronger.... I like the solution you came up with to fix your cracked bowl: Pretty clever adding a washer and fusing it!
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lordsorril
freely admits to licking rocks
Member since April 2020
Posts: 866
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Post by lordsorril on Aug 28, 2020 17:28:42 GMT -5
Scrap.......once they develop a seam........... expansion, contraction, weight, heat and motion will only expose the weakness more. Temporary glue fixes will wear just like a melting fusion epoxy will. IMHO, not worth the frustration and mess that comes with band-aids......if you tumble frequently. Yes, I'm going to do some research on different epoxy resins. If I have to spend more than a few bucks to try it out--I'm not going to waste my time/money.
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quartz
Cave Dweller
breakin' rocks in the hot sun
Member since February 2010
Posts: 3,352
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Post by quartz on Aug 28, 2020 22:10:00 GMT -5
Over time people have talked of repairing a variety of barrels with "Shoe Goo" and said it worked for them. No personal experience, maybe someone will come on that has used it.
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scottyh
starting to spend too much on rocks
Member since November 2007
Posts: 181
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Post by scottyh on Aug 28, 2020 22:11:28 GMT -5
Just bin it... its not worth pissing round with it... However, I am surprised it only lasted a year... I have had my 120/220 stage bowl going constantly for 3 years now and it has plenty of meat left on it.
Cheers Scott
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lordsorril
freely admits to licking rocks
Member since April 2020
Posts: 866
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Post by lordsorril on Aug 29, 2020 4:58:58 GMT -5
Just bin it... its not worth pissing round with it... However, I am surprised it only lasted a year... I have had my 120/220 stage bowl going constantly for 3 years now and it has plenty of meat left on it. Cheers Scott Yes, I admit I've had a relatively smooth piece of blue corundum in there for the last few months--can't help but think that didn't do me any favors...
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,561
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Post by jamesp on Aug 29, 2020 7:44:29 GMT -5
If it is made of HDPE try welding it. Polyethylene can be welded to. Consider laminating a say about a 1/8"sheet cut-to-fit from a plastic 55 gallon drum or some other source using a hot air gun. A practice and compatibility run can be attempted with a small sample around the edge. Youtube has lots of videos about the process.
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lordsorril
freely admits to licking rocks
Member since April 2020
Posts: 866
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Post by lordsorril on Aug 29, 2020 11:22:28 GMT -5
If it is made of HDPE try welding it. Polyethylene can be welded to. Consider laminating a say about a 1/8"sheet cut-to-fit from a plastic 55 gallon drum or some other source using a hot air gun. A practice and compatibility run can be attempted with a small sample around the edge. Youtube has lots of videos about the process. That is a good idea. I've fused plastic before with mixed results, but, if the choice is between trying to fuse it and throwing it in the trash--I don't have much to lose.
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Post by victor1941 on Aug 29, 2020 12:34:02 GMT -5
I have repaired a UV-18 bowl by cutting up an old pilates ball and then gluing strips on the outside with gorilla glue. The strips are held in place with duct tape until set. The problem is the bowl attains a different shape and shows a different motion. You might also check that one spring is not broken or weak.
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lordsorril
freely admits to licking rocks
Member since April 2020
Posts: 866
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Post by lordsorril on Aug 30, 2020 17:21:25 GMT -5
I have repaired a UV-18 bowl by cutting up an old pilates ball and then gluing strips on the outside with gorilla glue. The strips are held in place with duct tape until set. The problem is the bowl attains a different shape and shows a different motion. You might also check that one spring is not broken or weak. That is interesting! What sort of motion do you get in the bowl now?
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Post by victor1941 on Aug 30, 2020 19:42:00 GMT -5
The bowl material rotation and revolution for me are both slower. My tumble is normally cabs but sometimes I do small slabs. The experts need to explain how the vibrational energy transfer changes but the small slabs seem to slow the most.
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lordsorril
freely admits to licking rocks
Member since April 2020
Posts: 866
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Post by lordsorril on Sept 1, 2020 6:42:18 GMT -5
So I got my new UV18 bowl from Kingsley North and I was about to put it on, and I noticed a few holes in the foam pad on the base. When my bowl cracked I thought these holes in the foam pad were from grit/rocks/slurry getting on the base and ripping it up. I noticed that there are exactly four holes equidistant to each other (I never trust coincidence). I opened the holes in the foam pad a little to check it out better and found that these spots are actually the bolt heads protruding. If I align the cracked bowl over the post then the cracks line up with these bolt heads. I suspect the foam pad deteriorated over time and and thinned enough to allow contact with the bowl. This may explain the odd action I have been seeing for a few weeks before the bowl broke. In addition to my ongoing efforts to repair the bowl: I will also now have to replace the foam pad--or at least add cushioning over the four bolt heads... I have some ideas for cushioning material, but, I won't know how they will impact the vibration until I test them out...
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