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Congratulations to auscarver and his Aussie Rhodonite Cab!

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Another cabochon contest coming soon!

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 1 
 on: Today at 01:03:20 PM 
Started by edgarscale - Last post by Sapphireminer
 Hi Mary Hope you are both on the mend and can get out into the sunshine and have agreat trip away.
Ddave

 2 
 on: Today at 01:02:45 PM 
Started by Amylynn - Last post by Amylynn
How do you guys feel about wheel size for cutting opals?


I'm building a machine and trying to figure out if I want 4" or 6" wheels. The prices i'm looking at are pretty close to being the same for either size for Diamond Pacific wheels.

 3 
 on: Today at 12:23:47 PM 
Started by Amylynn - Last post by Amylynn
Basically something like this first image in this link: http://forum.rocktumblinghobby.com/thread/70002/homemade-6-wheel-cabber

Just open space in the center with all wheels. My idea was it might be better for the shaft to give it that support so I never have issues with wobbles. I don't know much about machines or technical stuff, so it might be overkill to do it for that reason. Is a 1" steel shaft strong enough to stay perfectly straight with no support?

 4 
 on: Today at 12:02:43 PM 
Started by Slabbercabber - Last post by rocks2dust
I have a little box full of them and although they are interesting not much you can do with them.  I pulled 2 out today to show a pic.  After looking at them I am leaning more towards Cinnabar.
Those look like great barite specimens, and the Yellow Cat area has those, too. The pseudomorph nodules usually look different, however, with the top of the thin crystal blades generally knocked off. While barite is too soft to cab, the pseudomorphs have had the barite replaced and are pretty solid and can make good cab material. The more solid barite pseudomorphs from Yellow Cats and McDermitt areas often gets confused with sagenite agate once sliced. I wish I knew where I put my examples, but there are some photos of this material on the 'net (e.g., the old auction here and this collecting trip). They come in several color combos, and I don't think that the red comes from cinnabar (especially as it is too hard for cinnabar and doesn't streak red).

 5 
 on: Today at 11:26:14 AM 
Started by Amylynn - Last post by irockhound
Not sure of your design idea, a pic or sketch might help.  If I had a solid shaft and put the wheels center and bearings on the outside changing wheels would require dealing with the bearings.

 6 
 on: Today at 11:22:13 AM 
Started by Slabbercabber - Last post by irockhound
I was going to post the Yellow Cat nodules when I first read the post but I was having trouble identifying them but I think you are right with the Chalcedony after Barite.  I have a little box full of them and although they are interesting not much you can do with them.  I pulled 2 out today to show a pic.  After looking at them I am leaning more towards Cinnabar.

 7 
 on: Today at 10:26:20 AM 
Started by Amylynn - Last post by Amylynn
I realize also that everyone says to get a shaft with opposite threads on either end.  I am guessing if I put bearings on both sides, I can't really use the threads to make sure everything is tight...?  If that makes sense..  If I did that it would put unwanted pressure on the bearing blocks, right?  :dontknow:

 8 
 on: Today at 09:36:43 AM 
Started by Amylynn - Last post by Amylynn
I'm trying to plan out a build for a cabbing machine so I can start the process... but there are a few things I'm unsure of.

  I noticed most diy builds featured here have the bearings near the center of the machines. I am hoping to do something more like the pixie, and put them on the outside. I think the main reason I want to do this is because of issues I had with my (transient) Cabking... with wobbling on the shafts.

 Is this a good idea, or is there a reason most builds aren't like that?

Anything you guys know about the bearing placement will help!





I'm also wondering what kind of steel to use for the shaft, and if there's any problem with using LDPE plastic to make the housing.

 9 
 on: Today at 08:45:39 AM 
Started by edgarscale - Last post by rocks2dust
Get well, and have a great trip! Take plenty of photos!

 10 
 on: Today at 08:37:48 AM 
Started by Slabbercabber - Last post by rocks2dust
I'm thinking it looks like nodules I have found at Yellow Cat, but I can't remember what they were.
I think what you may be remembering are the chalcedony after barite pseudomorph nodules from Yellow Cat. I think I still have one or two somewhere around here, though not in the pretty red of yours. The barite original crystals accounted for the crisscross inclusions, and sometimes more obvious when you saw them in half.

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