DIAMOND PACIFIC Genie Handbuch - Seite 7

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depress slightly to conform to your stone. This eliminates the flat

spots left by the grinding wheels and will cause fewer scratches

than would be produced by pressure that is too light.

It is important to hold your stone so that you do not allow the upper

or leading edge to act as a plow and dislodge diamonds from the

surface of the wheel. The diamonds in Nova Wheels are firmly

embedded in the resin and with proper use cannot be dislodged to

cause contamination in proceeding from one wheel to the next. But

they can be dislodged with the sharp edge of a stone.

To prolong the life of your Nova Wheels, be certain to prepare your

stone properly on the grinding wheels prior to sanding. Use the

metal bond wheels to grind your stone to its final size and shape,

and to remove all sharp edges and corners. This leaves only the

final sanding and polishing to the Nova Wheels. Similarly, it is

important to do a good job of sanding at each stage before going

to the next as the finer grit wheels will take much longer to remove

scratches than do the coarser wheels.

If your stone still has scratches after the final polish, check the

following procedures:

Make certain all deep scratches left by the coarse (80

grit) grinding wheel are removed by the fine (220 grit)

grinding wheel.

Make certain you are using enough pressure on the

Nova Wheels. Too light a pressure can cause scratches.

Make certain your Nova Wheels have been broken in

properly, especially the 3000 grit wheel and 14000 grit

disc. If any one wheel seems to be causing the

scratching, take a large agate cab and work it across the

entire surface of the wheel.

Almost all problems with scratches are caused by

improper procedure in the above three areas.

Procedure for Grinding and

Polishing Cabochons

Pre-Forming – Preparing Stone for Grinding Wheels:

Since most gem material comes in sizes and shapes larger than

desired for a single cabochon, it must be pre-formed. This is usually

done by cutting the rock into slabs about 1/4 inch thick with a lapidary

or rock saw. The best areas of the slab are then selected and marked

with a template for shape and size of desired stones. Excess material

is removed with a trim saw or one of the other tools available for this

purpose. The more material that can be removed from a pre-formed

stone at this step, reducing it to as near its finished size as possible, the

less time will be taken in the grinding process. Just as important, the life

of the grinding wheels will be increased

Grinding on the Galaxy Grinding Wheels:

The basic procedure is to grind your stone to proper size and shape

on the Galaxy Grinding Wheels. If the stone is properly prepared on the

grinding wheels, it is only a matter of minutes more to polish it on the

Nova Polishing Wheels.

First grind your cabochon to the approximate size of the template

outline using the left hand or coarse (80 grit) Galaxy Wheel. Use light

to medium pressure and work the stone over the entire surface of the

wheel. Check the stones size as you work, either with the template or

the mounting in which it will be set. Leave a small amount of material

outside the outline so that the stone is slightly larger than the template

or mounting. The balance of the excess material will be removed in fine

grinding and some in the sanding process. Using the Cab Rest during

the above procedure will make it easy to grind a uniform 12-½ degree

bezel angle all around your stone.

Proceed to the fine (220 grit) Galaxy Wheel, making certain that

you move the geyser to the wheel you are using. Again, a light to

medium pressure is all that is necessary. Finish grinding the bezel of

the stone, leaving only a small amount of material that makes the stone

just a fraction too large.

Now move back to the coarse grinding wheel to grind the face or

dome of the cab to shape. For best results, the stone should be dopped

(glued to the end of a dowel with dop wax or other adhesive) to enable

you to hold it more easily.

Grind from the edge towards the center of the stone, and then back

to the edge using a circular and oscillating motion as you work. The

circular component of this motion is accomplished by continually

rotating the base of the dop stick using your right hand. At the same

time, your left hand is used to move the stone back and forth in an