Achat csiszolat Gyöngyöstarján, 10x6cm

2010. augusztus 25., szerda


What is the cabochon?
In India  many years ago the cutters cut lot of sapphire from there, the form was the same what they found in the river but well polished by hend. We call it Free form cabochons. They made lot of silver things with these sapphire for the Maharadsas..After the cutters had best toosl for cutting and they make nice stones, half side round half side flat like in this time.

Now you can buy very good tolls for cutting, like concave diamond wheel ( 1. photo) But many cutter use cabbing machines with 6 or 8 cutting wheel.                                                  
   How can you cut cabochon? Firt you need a stone slab, if yoi have cutting machine you can cut, if not, you can buy. You need template with round and oval form, these are same size like the stone settings  , after you finish your stone you can put the stone to the settings and the jewellery is ready.
2. photo

Next step, make marks to the slad with pencil or aluminium stick, they are semi waterproof. ( 2. Photo)Now you can cut it with a thin cutting disc. If it is ready gluing the stone to dte dop stick with lapidary wax.( 3 photo) Next step sending the oval with  80 grit diamond wheel, i use a Diamond Pacific wheel for it.
                                                                                                                                  3. phot

If the oval is calibrated cut the top, first 45 degres to the side and afrte finish the arc.
I use after it a  80 grit dics an othet type of diamond disc from Diamond Pacific, it is a NOVA wheel
this is soft, i can push the stone into the wheel, this give me a perfect form, i start it with 220 grit and after 600 and 1200 grit.

The last step the polishing on felt lap.

On  the last photo: Hungarian agate cabochon.

2010. augusztus 14., szombat

Flat stones


In the first time i made only flat stones, usually from Hungarian agates.

It is not too dificult work if you have pofessionat tools, but in Hungary you can't buy nothing for cutting.
On the factory made cutting machines you have a small things for keeping the stones, afret the cutting you got a smooth surface. On my machine i don't have it, i keep my stones  with my hands, ( i sill have all my fingers :-) ) mostly i got a nice surface to my stones  but sometimes i have stairs on the stones.

After the cut i use this technic:

I use for sending 400 gtir of SiC powder on steel lap, i  am doing it untill the surface is perfectly flat, without craks, the  next is 800 grit of SiC by hend for pre polish , next step  is a 800grit of diamond  soft flat lap in an electric motor with 2890RPM  the result is better  pre polish  i get lightly mirror surface, lot of cutter call it polished stone but  i use Cerium Oxide for polishing  on felt lap.

My best work was with this technic 450pcs. of agates in a month.

The biggining

So, i just start to write my firts blog about minerals, gemstones, cutting and technic for cutting.

Who i am?  I'm Janos Zsebe, i cut stones 10 years ago, my teacher was Istvan Ecsedi  , he  cut stones more than 30 years ago.  He  geve me lot of information how can i cut and polish stones.

In the first years  i built few machine for cutting and polishing, these are working well also in this time.

In my blog in the first time you will read my last years, how i did my stones and after i will write my new stones included cabochons, spheres, tumbled stones and faceting too.