scottie
off to a rocking start
Member since August 2021
Posts: 15
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Post by scottie on Aug 28, 2021 21:48:59 GMT -5
I love Obsidian from Glass Butte. I'm a newbie to polishing but I would rather lap polish than tumble. I was able to get a couple of nice polished pieces after purchasing a few disks for my hand held grinder but it seems the 3000 grit disk is causing more scratches than my 80 grit disk after just a few use's. LOL. I'm looking for any advice on a disk to purchase that is 3000 grit and will last more than a couple use's. Thanks.
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Post by jasoninsd on Aug 28, 2021 23:05:30 GMT -5
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Post by opalpyrexia on Aug 29, 2021 10:28:05 GMT -5
Welcome from Washington, scottie. Good to see you here!
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Post by greig on Aug 29, 2021 10:46:38 GMT -5
I love Obsidian from Glass Butte. I'm a newbie to polishing but I would rather lap polish than tumble. I was able to get a couple of nice polished pieces after purchasing a few disks for my hand held grinder but it seems the 3000 grit disk is causing more scratches than my 80 grit disk after just a few use's. LOL. I'm looking for any advice on a disk to purchase that is 3000 grit and will last more than a couple use's. Thanks. Hand grinder? Dry or wet? Hard or soft backed disk? I am no expert, but suspect you would be better off after the scratches are again removed to polish using a damp felt pad with dry high number AO, CO or diamond polish.
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Post by rockjunquie on Aug 29, 2021 14:22:36 GMT -5
Welcome from Virginia! A lot of people have a love hate relationship with obsidian. It can be difficult.
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scottie
off to a rocking start
Member since August 2021
Posts: 15
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Post by scottie on Aug 29, 2021 15:01:17 GMT -5
I appreciate this info. I might try the silicone carbide method. Thanks again.
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scottie
off to a rocking start
Member since August 2021
Posts: 15
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Post by scottie on Aug 29, 2021 15:05:26 GMT -5
I love Obsidian from Glass Butte. I'm a newbie to polishing but I would rather lap polish than tumble. I was able to get a couple of nice polished pieces after purchasing a few disks for my hand held grinder but it seems the 3000 grit disk is causing more scratches than my 80 grit disk after just a few use's. LOL. I'm looking for any advice on a disk to purchase that is 3000 grit and will last more than a couple use's. Thanks. Hand grinder? Dry or wet? Hard or soft backed disk? I am no expert, but suspect you would be better off after the scratches are again removed to polish using a damp felt pad with dry high number AO, CO or diamond polish.
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scottie
off to a rocking start
Member since August 2021
Posts: 15
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Post by scottie on Aug 29, 2021 15:28:09 GMT -5
The hand grinder is mounted to my work bench. I have 6 and 8 inch diamond disks from 80- 3000 grit all hard disks. I use water when grinding then polish with cerium oxide. I was able to get 4 beautiful polished pieces but then after that I could no longer bring out the shine anymore. I keep going back to the 260 grit and repeat but seems that the 3000 grit disk just makes it worst. I'm not sure how long these disks are to last but it's not worth it to just get 4 pieces out if it.
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scottie
off to a rocking start
Member since August 2021
Posts: 15
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Post by scottie on Aug 29, 2021 15:30:48 GMT -5
Welcome from Virginia! A lot of people have a love hate relationship with obsidian. It can be difficult. Thank you rockjunquie:)
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scottie
off to a rocking start
Member since August 2021
Posts: 15
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Post by scottie on Aug 29, 2021 15:33:21 GMT -5
Welcome from Washington, scottie. Good to see you here! Thank you opalpyrexia. I'll bet you get some good obsidian near you. I'm in Charleston S.C. so I must import.
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scottie
off to a rocking start
Member since August 2021
Posts: 15
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Post by scottie on Aug 29, 2021 15:35:28 GMT -5
Seems you and I have the same problems. Might try the silicon carbide method. You try that yet?
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Post by hummingbirdstones on Aug 29, 2021 16:53:57 GMT -5
Welcome from Northern Arizona!
Some rocks just don't like the 3,000. One other issue with 3,000 diamond plated laps is that for some reason (there is a real reason but I can't remember the scientific explanation) is that the plating process doesn't hold the 3,000 mesh diamond as well and the lap could start shedding diamonds. Then you have a rogue 3,000 diamond rolling around under your stone gouging the hell out of everything.
A few other suggestions for you: Get a 3,000 diamond resin discs that doesn't have that problem and use it on top of your diamond lap, or use diamond paste on a felt or Tech-11 pad.
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Post by jasoninsd on Aug 29, 2021 17:46:20 GMT -5
Seems you and I have the same problems. Might try the silicon carbide method. You try that yet? I haven't tried it yet. I have both obsidian cabs I was working on sitting on my workbench...still dopped...and still staring and laughing at me every time I walk by them! LOL
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scottie
off to a rocking start
Member since August 2021
Posts: 15
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Post by scottie on Aug 29, 2021 18:41:28 GMT -5
Seems you and I have the same problems. Might try the silicon carbide method. You try that yet? I haven't tried it yet. I have both obsidian cabs I was working on sitting on my workbench...still dopped...and still staring and laughing at me every time I walk by them! LOL I have about 7or 8 pieces that I have in a rough shape but I have 2 that I keep going back to try to shine up with no luck. I ordered some silicon carbide disks up to 2000 grit after that I will polish with cerium oxide. I have no plan after that but either way I'll post my results. Thanks for your help jasoninsd
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scottie
off to a rocking start
Member since August 2021
Posts: 15
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Post by scottie on Aug 29, 2021 18:44:50 GMT -5
Welcome from Washington, scottie. Good to see you here! Thanks Gary. I just recognized this was you. Thanks for bringing me here.
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Post by jasoninsd on Aug 29, 2021 18:48:49 GMT -5
I haven't tried it yet. I have both obsidian cabs I was working on sitting on my workbench...still dopped...and still staring and laughing at me every time I walk by them! LOL I have about 7or 8 pieces that I have in a rough shape but I have 2 that I keep going back to try to shine up with no luck. I ordered some silicon carbide disks up to 2000 grit after that I will polish with cerium oxide. I have no plan after that but either way I'll post my results. Thanks for your help jasoninsd I think I'm actually going to try and see what I can do with the Dremel on at least one of them. I'm going to want to wear a respirator, but I have to shave first...and I'm in no hurry for that at the moment! LOL
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catskillrocks
fully equipped rock polisher
Member since July 2008
Posts: 1,270
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Post by catskillrocks on Aug 29, 2021 21:00:13 GMT -5
Welcome from Western New York. I sure hope that you get this figured out.
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scottie
off to a rocking start
Member since August 2021
Posts: 15
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Post by scottie on Aug 29, 2021 22:41:11 GMT -5
Welcome from Northern Arizona!
Some rocks just don't like the 3,000. One other issue with 3,000 diamond plated laps is that for some reason (there is a real reason but I can't remember the scientific explanation) is that the plating process doesn't hold the 3,000 mesh diamond as well and the lap could start shedding diamonds. Then you have a rogue 3,000 diamond rolling around under your stone gouging the hell out of everything.
A few other suggestions for you: Get a 3,000 diamond resin discs that doesn't have that problem and use it on top of your diamond lap, or use diamond paste on a felt or Tech-11 pad.
Yes. The 3000 grit disk seems to be the problem. Getting all the way to that point and then it gets ruined is such a let down. I'll look into the resin disks. Thanks
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Post by rmf on Aug 30, 2021 3:40:37 GMT -5
scottie Ready to beam up!!! Sorry just had to do it. Make sure the 3000 is broken in. since the obsidian is so soft if the 3000 has points like they do when they come in new then they will gouge. The finer the grit the more break in time the wheel/lap takes.
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scottie
off to a rocking start
Member since August 2021
Posts: 15
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Post by scottie on Aug 30, 2021 9:33:00 GMT -5
scottie Ready to beam up!!! Sorry just had to do it. Make sure the 3000 is broken in. since the obsidian is so soft if the 3000 has points like they do when they come in new then they will gouge. The finer the grit the more break in time the wheel/lap takes. Yes. That is the second time I've heard that. Just don't understand how I got the first 4 pieces to look good.
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