rockbrain
Cave Dweller
Member since January 2022
Posts: 2,491
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Post by rockbrain on Sept 21, 2022 19:37:18 GMT -5
My cab machine has the usual lineup of 80 and 220 hard wheels with 280#, 600#, 1,200# and 3,000# resin. I was looking at replacing the 280 resin with a 220 resin. Has anyone tried this? Were there any issues? Seems like it might be easier to remove scratches but I don't know about making the jump from 220 to 600.
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Post by hummingbirdstones on Sept 21, 2022 19:40:02 GMT -5
I believe Tela rockjunquie and a few other folks have done it and they love it.
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Post by rockjunquie on Sept 21, 2022 21:12:28 GMT -5
I switched to the 220 NOVA and will never go back. I don't know about other brands, but the DP 220 is just fine with the 600.
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Post by opalpyrexia on Sept 21, 2022 21:25:54 GMT -5
After struggling too often in trying to move successfully from the 280 to the 600, I finally followed the advice of Tela and others and replaced the 280 with a Johnson Bros. 220 Nova. What a difference! Now every in-process cab promptly graduates to the 600. I am very grateful for their advice.
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khara
fully equipped rock polisher
Member since September 2022
Posts: 1,710
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Post by khara on Sept 21, 2022 23:52:50 GMT -5
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Post by rockjunquie on Sept 22, 2022 4:33:42 GMT -5
Yes.
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nik
spending too much on rocks
Member since May 2019
Posts: 315
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Post by nik on Sept 22, 2022 5:30:42 GMT -5
I will add one more vote to the 220 grit first stage of sanding. Although I am moving away from soft wheels and going back to belts on an expanding drum.
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Post by opalpyrexia on Sept 22, 2022 9:08:38 GMT -5
Yes. That’s correct.
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Post by rmf on Sept 22, 2022 12:17:27 GMT -5
rockbrain I have been using 80, 220hard, 220nova, 280nova, 600nova, 1200nova, 3000nova, 8000nova Typically stopping at 3000 and doing a conventional polish with tin oxide. Here of late I was told that the 220 Nova wheel was no longer available which has caused me to plan a new system. So I will ask here. Has anyone tried: 80, 140, 240 all in hard metal bonded wheels, followed by Nova(s) 280,600...? I can see advantages to this and a few disadvantages. All opinions welcome.
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khara
fully equipped rock polisher
Member since September 2022
Posts: 1,710
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Post by khara on Sept 22, 2022 12:55:10 GMT -5
Yes. That’s correct. Interesting. So it sounds like moving from a hard grinding wheel to a soft nova wheel, there is a surface improvement there even though the grits are the same number. rmf Ya, I just checked several sites and no 220 Nova's. Kinda lame since you guys have your system worked out. Hopefully the current line-up of Nova's works fine enough cause I just ordered a set!
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Post by roy on Sept 22, 2022 13:08:16 GMT -5
My cab machine has the usual lineup of 80 and 220 hard wheels with 280#, 600#, 1,200# and 3,000# resin. I was looking at replacing the 280 resin with a 220 resin. Has anyone tried this? Were there any issues? Seems like it might be easier to remove scratches but I don't know about making the jump from 220 to 600. i changed mine years ago to a 220 works way better for me my hard wheel is a 180 though
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Post by rockjunquie on Sept 22, 2022 13:20:52 GMT -5
As far as I know, Johnson Bros is the only one who has it now. It's not DP. It's their own brand.
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khara
fully equipped rock polisher
Member since September 2022
Posts: 1,710
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Post by khara on Sept 22, 2022 14:13:50 GMT -5
As far as I know, Johnson Bros is the only one who has it now. It's not DP. It's their own brand. OK. I read that you aren't "supposed" to mix and match brands, like Johnson Bros mixed with Nova. I also read if you replace one wheel you should replace all so they have the same level of wear. Are these guidelines true? Or just someone trying to sell their wheels?
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Post by rockjunquie on Sept 22, 2022 14:16:54 GMT -5
As far as I know, Johnson Bros is the only one who has it now. It's not DP. It's their own brand. OK. I read that you aren't "supposed" to mix and match brands, like Johnson Bros mixed with Nova. I also read if you replace one wheel you should replace all so they have the same level of wear. Are these guidelines true? Or just someone trying to sell their wheels? Well, more people than I have mixed brands. And, I haven't needed to replace them all at one time, so didn't.
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khara
fully equipped rock polisher
Member since September 2022
Posts: 1,710
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Post by khara on Sept 22, 2022 15:03:36 GMT -5
OK. I read that you aren't "supposed" to mix and match brands, like Johnson Bros mixed with Nova. I also read if you replace one wheel you should replace all so they have the same level of wear. Are these guidelines true? Or just someone trying to sell their wheels? Well, more people than I have mixed brands. And, I haven't needed to replace them all at one time, so didn't. You are a rebel. Or reasonable. Or frugal. All are good. Thanks!
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oldschoolrocker
fully equipped rock polisher
Member since January 2019
Posts: 1,540
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Post by oldschoolrocker on Sept 22, 2022 16:50:13 GMT -5
Il add another to the Johnson bros 220 soft
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Post by hummingbirdstones on Sept 22, 2022 20:03:49 GMT -5
As far as I know, Johnson Bros is the only one who has it now. It's not DP. It's their own brand. OK. I read that you aren't "supposed" to mix and match brands, like Johnson Bros mixed with Nova. I also read if you replace one wheel you should replace all so they have the same level of wear. Are these guidelines true? Or just someone trying to sell their wheels? khara there is no rule that says you have to use all the same brand wheels. They also wear out depending on how much use each wheel gets. If you use your 600 a lot more than the others, of course that one will wear out first and need to be replaced sooner. Whoever wrote that was is full of it and is maybe a supplier of that particular brand and trying to con people into spending more money than they need to for their own gain. I have a name for people like that that I can't/won't post here.
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Post by rmf on Sept 23, 2022 4:08:26 GMT -5
khara Years ago I complained to a vendor that the 280nova was wearing out too fast. He suggested 220 Nova. This worked just like using SiC when you coarse ground a cab with an 80 Grit SiC wheel then started sanding with a 80grit SiC belt. Changing the surface from a deeply scratched surface to one that was more satiny. The sand paper was on a drum that flexed and was soft and cut less deeply while removing the deepest scratches of the hard wheel. Works the same way with the Novas. In the original wheel config from DP (100G, 220G, 280n, 600n, 1200n, 14000n) that was on my grinder the 280 wore out 2x faster than the 600 and the 600 wore out 4x faster than the 1200. You were replacing the 280 all the time and I grind them until the bare spots get unbearable. I have tried at least 3 other brands at the same time and agree with hummingbirdstones comment as that seller is full of it. Can anyone here imagine changing out a set of wheels when one of the set wears out. It would cost a fortune to cut stones. Better to go back to SiC.
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khara
fully equipped rock polisher
Member since September 2022
Posts: 1,710
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Post by khara on Sept 23, 2022 11:18:18 GMT -5
OK. I read that you aren't "supposed" to mix and match brands, like Johnson Bros mixed with Nova. I also read if you replace one wheel you should replace all so they have the same level of wear. Are these guidelines true? Or just someone trying to sell their wheels? khara there is no rule that says you have to use all the same brand wheels. They also wear out depending on how much use each wheel gets. If you use your 600 a lot more than the others, of course that one will wear out first and need to be replaced sooner. Whoever wrote that was is full of it and is maybe a supplier of that particular brand and trying to con people into spending more money than they need to for their own gain. I have a name for people like that that I can't/won't post here. I hadn't really thought about the fact that they'd wear out at different rates. It makes total sense and it did seem off to me that you couldn't just buy one at a time. I mean what if you gouged or somehow broke one? It's gotta be realistic to replace them individually. I can't remember where I saw the recommendation, I've been all over the place trying to learn.
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khara
fully equipped rock polisher
Member since September 2022
Posts: 1,710
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Post by khara on Sept 23, 2022 11:29:41 GMT -5
khara Years ago I complained to a vendor that the 280nova was wearing out too fast. He suggested 220 Nova. This worked just like using SiC when you coarse ground a cab with an 80 Grit SiC wheel then started sanding with a 80grit SiC belt. Changing the surface from a deeply scratched surface to one that was more satiny. The sand paper was on a drum that flexed and was soft and cut less deeply while removing the deepest scratches of the hard wheel. Works the same way with the Novas. In the original wheel config from DP (100G, 220G, 280n, 600n, 1200n, 14000n) that was on my grinder the 280 wore out 2x faster than the 600 and the 600 wore out 4x faster than the 1200. You were replacing the 280 all the time and I grind them until the bare spots get unbearable. I have tried at least 3 other brands at the same time and agree with hummingbirdstones comment as that seller is full of it. Can anyone here imagine changing out a set of wheels when one of the set wears out. It would cost a fortune to cut stones. Better to go back to SiC. Interesting. I haven't used silicon carbide but again the flexible vs hard surface makes sense that they'd grind differently even though they are the same grit. And I've wondered about the old school methods, using just an arbor and the silicone wheels and belts, not necessarily rock hobby specific tools. I've no experience with them though. I've only cabbed at a club where they have Genies. If these companies keep discontinuing products I can see the benefit to knowing these old school ways. I bet my husband's grandpa didn't have a Genie and we have a lot of really nice cabs from him. This also just makes me disappointed again that the 220 Nova was discontinued. Wonder why they did that, it seems a lot of people were using them.
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