lancemountain
starting to spend too much on rocks
Member since March 2017
Posts: 214
|
Post by lancemountain on Jan 2, 2020 14:43:18 GMT -5
Hello!
I've been seeing a lot of glass talk and I don't want to miss this boat! I found some great glass to tumble at the local thrift store so I'd like to get started!
I'm going to start with 120 grit for a few days, well cushioned. The only question is- rotary or vib?
Thank you and happy new year!
|
|
braat
spending too much on rocks
Member since December 2016
Posts: 350
|
Post by braat on Jan 2, 2020 15:50:35 GMT -5
I've only done one batch but they turned out Ok. I did the first stage in a rotary (Lortone 3 lb'er because it was idle)...I cut them to desired shape with the tile saw then smoothed/rounded the edges (somewhat) with the tile saw as well. Barrel 80%(ish) full of glass and water to about top of glass - no cushioning and 1 Tsp coarse grit. Weekly clean outs and recharge...they took about 2 - 4 weeks in rotary before they were ready to move on to the vibe for the rest of it. I never considered starting them in the vibe so I'll be interested in what others have to say...
Correction - I DID use cushioning - specifically 1/2 cup dry/used stage one slurry. I should know better than to rely on memory...although deciphering my hand written notes is another thing...
|
|
EricD
Cave Dweller
High in the Mountains
Member since November 2019
Posts: 1,142
|
Post by EricD on Jan 2, 2020 17:53:56 GMT -5
Wow, my glass shaped up in 4 days in my rotary with SiC 46/70, tossed in with a bunch of montana moss, jasper, and tiger eye that is taking forever. It was super loud! It's waiting it's turn to hit 150/220 in the vibe
|
|
|
Post by hummingbirdstones on Jan 2, 2020 20:46:49 GMT -5
Hello! I've been seeing a lot of glass talk and I don't want to miss this boat! I found some great glass to tumble at the local thrift store so I'd like to get started! I'm going to start with 120 grit for a few days, well cushioned. The only question is- rotary or vib? Thank you and happy new year! jamesp - Care to comment?
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,159
|
Post by jamesp on Jan 3, 2020 2:27:11 GMT -5
Hello! I've been seeing a lot of glass talk and I don't want to miss this boat! I found some great glass to tumble at the local thrift store so I'd like to get started! I'm going to start with 120 grit for a few days, well cushioned. The only question is- rotary or vib? Thank you and happy new year! jamesp - Care to comment? I use a rotary to shape it.
|
|
tkvancil
fully equipped rock polisher
Member since September 2011
Posts: 1,546
|
Post by tkvancil on Jan 3, 2020 11:44:20 GMT -5
Hello! I've been seeing a lot of glass talk and I don't want to miss this boat! I found some great glass to tumble at the local thrift store so I'd like to get started! I'm going to start with 120 grit for a few days, well cushioned. The only question is- rotary or vib? Thank you and happy new year! I just finished some glass that was all done in the vibe. Some were preshaped, some not. Used a mix of ceramic and small agates/quartz as media and a double dose of 220. Preshaped done in 1 to 2 runs to my satisfaction, non-shaped took 4 to 5 runs. I did notice that the slurry produced was very sticky and needed a little extra attention. It can be done all vibe but shaping in rotary is probably more efficient. In past rotary runs with man made glass I had gas build up. You'll need to watch for that.
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,159
|
Post by jamesp on Jan 3, 2020 12:26:09 GMT -5
I noticed my home melted glass rarely creates gas tkvancil. It has lots of bubbles in it but the bubbles must not contain much pressure probably because the glass is melted at room pressure. Glass such as obsidian is often under great weight and glass containing reactive chemicals or was cast under pressure can hold serious pressures in the bubbles. Such small internal bubbles holding gas under high pressure are breached by the abrasives(especially during coarse grind) causing them to release. Like an aerosol can being punctured. That's my theory anyway. However most glass is soda lime glass and is darn alkaline. You may find glass slurry similar to Portland cement and hard on your skin. If acidic rocks or water is used in the barrel it should invite a baking soda/vinegar reaction.
|
|
|
Post by greig on Jan 3, 2020 13:37:32 GMT -5
I noticed my home melted glass rarely creates gas tkvancil . It has lots of bubbles in it but the bubbles must not contain much pressure probably because the glass is melted at room pressure. Glass such as obsidian is often under great weight and glass containing reactive chemicals or was cast under pressure can hold serious pressures in the bubbles. Such small internal bubbles holding gas under high pressure are breached by the abrasives(especially during coarse grind) causing them to release. Like an aerosol can being punctured. That's my theory anyway. However most glass is soda lime glass and is darn alkaline. You may find glass slurry similar to Portland cement and hard on your skin. If acidic rocks or water is used in the barrel it should invite a baking soda/vinegar reaction. I like your explanation of the types of glass and potential for a chemical reaction producing gas. I get surprised once in a while by a gassy rock tumble (gas in the barrel, not in me...hehe). In fact, I used to like the results using some baking soda in stage 4 rotary, but stopped doing that because of barrel gas. At the same time, I don't think the gas in the barrel is from the little bubbles in the manufactured glass.
|
|
|
Post by knave on Jan 3, 2020 13:40:52 GMT -5
We put some float copper in a Tupperware container with vinegar and salt. It started growing a green coral reef. What is it?
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,159
|
Post by jamesp on Jan 3, 2020 13:53:48 GMT -5
I noticed my home melted glass rarely creates gas tkvancil . It has lots of bubbles in it but the bubbles must not contain much pressure probably because the glass is melted at room pressure. Glass such as obsidian is often under great weight and glass containing reactive chemicals or was cast under pressure can hold serious pressures in the bubbles. Such small internal bubbles holding gas under high pressure are breached by the abrasives(especially during coarse grind) causing them to release. Like an aerosol can being punctured. That's my theory anyway. However most glass is soda lime glass and is darn alkaline. You may find glass slurry similar to Portland cement and hard on your skin. If acidic rocks or water is used in the barrel it should invite a baking soda/vinegar reaction. I like your explanation of the types of glass and potential for a chemical reaction producing gas. I get surprised once in a while by a gassy rock tumble (gas in the barrel, not in me...hehe). In fact, I used to like the results using some baking soda in stage 4 rotary, but stopped doing that because of barrel gas. At the same time, I don't think the gas in the barrel is from the little bubbles in the manufactured glass. I have always suspected acid/alkaline reactions are the main cause of tumbling gas greig. Glass comes across as very inert until you grind it to a fine powder and add water. Or get the powder on your perspiring hands and reacts like Portland. It has strong alkalinity content. Due to a high lime content. Bubbles or ph reactions ?? Hard to prove which it is. I don't think Pyrex glass is made with lime. But most glass is soda lime glass. Never soak agates and many petrifications in straight Muriatic acid. Most likely you will see bubbles floating up. It will dissolve partially silicified calcium carbonate and other alkaline deposits out of the crevices and leave open crevices in them.
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,159
|
Post by jamesp on Jan 3, 2020 13:57:11 GMT -5
We put some float copper in a Tupperware container with vinegar and salt. It started growing a green coral reef. What is it? That would be a form of RocksInNJ, an unexplainable form of a green New Jersey alien skin rash.
|
|
|
Post by knave on Jan 3, 2020 13:59:13 GMT -5
My wife said it was disgusting so I cleaned it up. Daughter and I feel like it’s a cool work of art so we will continue the project in the basement instead of the food prep counter. The green crystals grew out of the bowl, over the side, and started to work along the counter.
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,159
|
Post by jamesp on Jan 3, 2020 14:04:47 GMT -5
My wife said it was disgusting so I cleaned it up. Daughter and I feel like it’s a cool work of art so we will continue the project in the basement instead of the food prep counter. The green crystals grew out of the bowl, over the side, and started to work along the counter. I think you made the right move in abandoning the kitchen Sir Dad.
|
|
tedw
starting to spend too much on rocks
Older rockhounds looking to retire
Member since December 2019
Posts: 102
|
Post by tedw on Jan 3, 2020 17:19:01 GMT -5
My wife said it was disgusting so I cleaned it up. Daughter and I feel like it’s a cool work of art so we will continue the project in the basement instead of the food prep counter. The green crystals grew out of the bowl, over the side, and started to work along the counter. I think you made the right move in abandoning the kitchen Sir Dad.
|
|
tedw
starting to spend too much on rocks
Older rockhounds looking to retire
Member since December 2019
Posts: 102
|
Post by tedw on Jan 3, 2020 17:25:41 GMT -5
My wife said it was disgusting so I cleaned it up. Daughter and I feel like it’s a cool work of art so we will continue the project in the basement instead of the food prep counter. The green crystals grew out of the bowl, over the side, and started to work along the counter. When in the doghouse, its usually the place to go.
|
|