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61  Stone Talk / Moderator, Hummingbirdstones ( Robin ) / Rough on the bench and slabs off the saw (general minerals board) / Re: Montana agate slab and question on: November 29, 2015, 05:42:39 pm
Yup! Turtle back, I'm not sure if it one word or two, though.
Bob
62  Stone Talk / Moderator, Hummingbirdstones ( Robin ) / Share Our Finished Cabochons and General Cabbing Questions / Tutorials / My After Thanksgiving Cab is a ...... on: November 28, 2015, 06:33:29 pm
Brazilian Agate that is a smaller one for me at 2-1/4" tall.
Bob
63  Lapidary Shop / Moderator, Catmandewe ( Tony ) / Miscellaneous Shop Talk / Re: Gloves - Looking For Rubber or Vinyl that are Skin Tight on: November 24, 2015, 06:52:52 am
Around the house and garage I use Nitrile gloves from Costco. 2 boxes with 100 pair in each box for less than $20. They are safer than latex because if they snag on something they will tear. Latex gloves snag and stretch and pull your hand into any rotating machinery. Mostly I use dops to give me better grip and control of the cab especially when polishing. When I'm sanding I sometimes use my finger on the underside to tell me that I'm not rocking the cab too far, but only on the finer grit belts. I do often grind/sand my left index nail and a little skin at times. Its just the price to pay for having fun doing lapidary.
Bob 
64  Stone Talk / Moderator, Hummingbirdstones ( Robin ) / Mineral Specimens / Re: ID help on: November 21, 2015, 09:14:21 am
Green moss possibly Horse Canyon or from Oregon. The green Moss from India is generally more translucent.
Bob
65  Stone Talk / Moderator, Hummingbirdstones ( Robin ) / Share Our Finished Cabochons and General Cabbing Questions / Tutorials / Re: Cutting concave? on: November 21, 2015, 09:12:16 am
I just use the standard grinding and sanding wheels. I do most of my work on an 8" wheel machine. You just turn the preform so the girdle is pointing at the wheel at the place you want the concave to be and grind in as far as you want. Then you turn the preform flat and continue grinding the rest of the girdle. As you grind the dome, when you get to the concave area  turn the  girdle towards the wheel and rock the preform inwards so the grinding will make that area concave. I generally work the concave inward about half way to the center but the rest of the dome grinding will continue all the way to the center. The sanding activity is done the same as the grinding. The curvature of the concave will match the diameter of your wheels. If you want a deeper concave you will have to go to a machine with smaller wheels. I have a home made carpet covered polishing wheel that I use almost exclusively for my polishing. When I made it I curved the outer front edge so that it would reach into the concave areas on the cab. This is very difficult to polish on a flat wheel.
Here is an example of a Montana Agate cab that I did with a concave side on it. The cab is about 3" tall. I have made some cabs with all four sides concave so it has a star shape to it . I don't have a photo of them but I will try to get some photos to show as an example, perhaps today.
Bob
66  The Gathering / Shows and Events / Re: Rock Show in Brewer Maine on: November 10, 2015, 08:25:43 pm
Plant more rock seeds and before you know it up pops more rockhounds!
Glad you had a great show!
Bob
67  Stone Talk / Moderator, Hummingbirdstones ( Robin ) / Share Our Finished Cabochons and General Cabbing Questions / Tutorials / Re: Cabs - Sharp Edges? on: October 30, 2015, 08:01:46 am
I always put a small bevel on the back edge on my cabs for all of the above reasons. It just gives a finished look and feel to the cab. Depending on the size of the cab (I do make cabs up to 6" across) the bevel width can be from 1/32" to 1/16" across. I hold the cab at a 45 degree angle and sand the bevel on a worn 220 grit S/C belt with a lot of water on the belt to keep the edge cool. I follow this with a worn 400 grit S/C and then to polish. It takes a few minutes but the time is well spent.
Bob
68  Stone Talk / Moderator, Hummingbirdstones ( Robin ) / Share Our Finished Cabochons and General Cabbing Questions / Tutorials / Brazilian Agate With Druzy on: October 29, 2015, 09:49:37 pm
This is today's cab. It is Brazilian Agate with a small druzy pocket. It is 4" tall and is destined to go into our display case that we take to regional gem and Mineral shows.
Bob
69  Lapidary Shop / Moderator, Catmandewe ( Tony ) / Miscellaneous Shop Talk / Poly Arbor Bearings on: October 26, 2015, 05:16:11 pm
Does anyone have any experience with rebuilding Poly Arbors?
Our club has many of these in the shop and we are having to replace the bearings in one and the bearing info doesn't come up on any bearing supplier's books.
Part no.  RAO12 CRS-2
Mfg. Koyo
Bob
70  Stone Talk / Moderator, Hummingbirdstones ( Robin ) / Rough on the bench and slabs off the saw (general minerals board) / Re: Smaller Glass Buttes Obsidian Piece on: October 24, 2015, 11:20:56 pm
I cut these at about 3/16" thick so they can show any transparency/translucency that may be in the material. This is the same thickness that I cut the large slabs, too. It is a bit more work to get a dome on my 4" to 6" wide cabs but the beautiful patterns are worth it. When I'm making cats eye obsidian cabs from the Davis Creek rainbow material I cut them almost 1/2" thick so the cab will have the black density to show the cats eye effect.  I am also hooked on obsidian and have been for 40+ years.
Bob
71  Stone Talk / Moderator, Hummingbirdstones ( Robin ) / Rough on the bench and slabs off the saw (general minerals board) / Smaller Glass Buttes Obsidian Piece on: October 24, 2015, 08:25:12 pm
Recently when I was digging through some Glass Buttes smaller pieces that I collected with my dad about 30 years ago I came across this one. It doesn't show much from the outside but I cut it just to see what it had inside. This photo shows the outside surface. There is no indication of any translucency in the black areas. It is about 5" across.

This photo shows the other side after I cut about 5 slabs from it. This side is shown polished and the black areas just look black!

This photo shows the last slab from the rough piece shown in the previous photo. It is polished on both sides. Striking, huh?
 
This photo is one side of the polished second slab from the rough. It is about 3" across.

This is the other side of the polished second cab from the rough.

I was surprised with what was inside such a ordinary piece of this material. This came from the digging area on the right side of the road coming off the highway past the cattle guard about halfway to the pond area.
I'm going to explore the innards of some of the other ordinary pieces that I have from that first digging many years ago.
Bob 
72  Lapidary Shop / Moderator, Catmandewe ( Tony ) / Miscellaneous Shop Talk / Re: Best flux on: October 21, 2015, 08:33:28 am
I only use Handi Flux (borax) and it works great for me.
Bob
73  Stone Talk / Moderator, Hummingbirdstones ( Robin ) / Identification Inquiries / Re: I usually don't ask but.. on: October 20, 2015, 10:45:27 am
The colors are like Paul Bunyon material but the pattern isn't.
Bob
74  The Gathering / Our Place / Re: Impactites VS Vulcan on: October 18, 2015, 07:06:28 am
Obviously a space ship landing site!
Bob
75  Creative Stone Works / Moderator, Michael Hoover / Carving Tips, Tricks and Pics / Re: Copper burs for use with diamond slurry on: October 18, 2015, 07:04:33 am
You can get felt sheets at McMaster Carr and use a gasket punch to cut out the circles for polishing wheels.
Bob
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