Fine working of gems, jewels, crystals

BPERFORMING OPERATIONS TRANSPORTING B28Stoneworking B28DWORKING STONE OR STONE-LIKE MATERIALS

B28D5/00Fine working of gems, jewels, crystals

B28D5/0005by breaking B28D5/0011with preliminary treatment B28D5/0017using moving tools B28D5/0023rectilinearly B28D5/0029rotating B28D5/0035cooperating with a straight breaking edge B28D5/0041the workpiece being brought into contact with a suitably shaped rigid body which remains stationary during breaking B28D5/0047using fluid or gas pressure B28D5/0052Means for supporting or holding work during breaking B28D5/0058Accessories specially adapted for use with machines for fine working of gems, jewels, crystals B28D5/0064Devices for the automatic drive or the program control of the machines B28D5/007Use, recovery or regeneration of abrasive mediums B28D5/0076for removing dust B28D5/0082for supporting, holding, feeding, conveying or discharging work B28D5/0088the supporting or holding device being angularly adjustable B28D5/0094the supporting or holding device being of the vacuum type B28D5/02by rotary tools B28D5/021by drilling B28D5/022by cutting with discs or wheels B28D5/023with a cutting blade mounted on a carriage B28D5/024with the stock carried by a movable support for feeding stock into engagement with the cutting blade B28D5/025with the stock carried by a pivoted arm B28D5/026with a cutting blade carried by a movable arm B28D5/027with a cutting blade arranged underneath a stationary work table B28D5/028with a ring blade having an inside cutting edge B28D5/029with a plurality of cutting blades B28D5/04by tools other than rotary type B28D5/042by cutting with blades or wires mounted in a reciprocating frame B28D5/045by cutting with wires or closed-loop blades B28D5/047by ultrasonic cutting