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Raymond Mill

Jade Bowl Grinding Machine

Although each of the five stages in table 2 corresponds to a certain historical period any craft or technology progresses gradually through exploration and creation. the accumulation of experience takes a long time. the refinement of a craft is first tested on a small scale and then gradually promoted and popularized. therefore a change in dynasty does not necessarily represent the immediate progress of a.

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    First generation circa 3500ndashcirca 2070 bce. the primitive rotary jade carving machine appeared in the hongshan and lingjiatan cultural sites of the neolithic age yang, 2006. these jade carving tools were made primarily from natural materials such as stone, wood, and bone. yang 1989a,b proposed two main features of the primitive rotary carving machine. the first is that it allowed the carver to assume a sitting position. the second is that it was manually rotated.

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    Second generation circa 2070 bcendashcirca sixth century bce. the bronze rotary machine emerged and thrived from the xia and shang dynasties to the early to mid-chunqiu period xu, 2014 as life in this period gradually centered on bronze technology. it is speculated that operators were kneeling and manually drove the machine to faster speeds than achievable before, based on the kneeling posture depicted in unearthed human stone carvings from this period and in the tomb of fuhao yang, 2006.

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    Third generation circa sixth century bcendashcirca 581 ce. the iron rotary machine appeared from the late chunqiu period until the nan-bei dynasty. carvers still knelt on the ground while operating the machine xu, 2014. as smelting technology improved, iron tools were increasingly used and the jade carving machine evolved accordingly. it was still manually driven but provided increased efficiency because iron tools were sharper and more wear-resistant xu, 2014.

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    Fourth generation circa 581ndash1960. the table-type iron rotary machine was used from the sui and tang dynasties through the ming and qing dynasties and into the 1950s yang, 2006 xu, 2014. in the sui and tang dynasties, interior furniture changed peoplersquos habit of sitting on the ground, and they instead sat on stools or chairs yang, 2006. as a result, the rotary machine in this period was of the table-type or tall-legged table-type and driven by a foot treadle that further increased its working efficiency figure 2.

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    If the tool is the fundamental force driving the evolution of jade carving, then craft is also an important factor. the two forces are inseparable. every innovation in tools allows the carving craft to take a leap forward xu, 2011. therefore, we will now analyze and summarize representative crafts used in different tool development periods table 2.

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    Bronze rotary machines circa 2070ndashcirca sixth century bce. although they emerged in the neolithic period, inlays in the xia, shang, and xizhou dynasties outnumber those before the xia dynasty and display outstanding intricacy. these inlays were mainly combinations of bronze and turquoise, jade and turquoise, or bronze and jade. jade vessels emerged in this period, with a corresponding rise in skilled hollowing xu, 2011.

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    Iron rotary machines circa sixth century bcendashcirca 581 ce. burial jade thrived in the chunqiu period and culminated in a set of special carving systems formed in the han dynasty. burial jade shows no significant difference from daily jade in terms of the carving procedure but it is more concise and less exquisite you, 2001. take the han badao concise carving craft in the han dynasty as an example. typical of burial jade, the lines from han badao are bold, vigorous, and concise, seemingly carved by swords figure 6.

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    The saphir 250 a2-eco is a dual-wheel grinding and polishing machine for working wheels 200250 mm which is conveniently operated by a 4.3 color touch screen. entire preparation methods may be edited, stored, and protected by a user account management. pressure, speed, and rotational direction of the polishing head are adjustable in the software. the optional topas eco dosing system provides automatic and programmable dosing that is controlled by the grinderpolisher touch screen.

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    The single wheel saphir 350 manual grinding and polishing system is built tough for high-volume specimen throughput using 250 mm 10 or 300 mm 12 wheel formats. high torque, variable speed motors are controlled by a sealed, touch button control panel. because the wheel is recessed below the solid aluminum chassis, the saphir 350 reduces abrasive splatter. the saphir 350 can be built either as a floor standing laboratory polishing table using systemlab cabinets or as a table top version.

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    The dual wheel saphir 360 grinding and polishing system is a heavy duty, large format manual preparation machine. two powerful, high torque motors drive each recessed grinding and polishing wheel separately to provide fast removal rates. modular electrical and mechanical components are easy to maintain and the large ball bearing spindle assembly is built for years of reliable service. the saphir 360 can be built as a bench top machine or combined with our systemlab furniture for a seamless laboratory layout.

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    The jade 700 water cooled dual belt grinder is the heavy duty champ of coarse grinding. stainless steel belt covers resist corrosion while the replaceable solid wear plate keeps the grinding surface flat. the belt tracking system is precision machined from stainless steel and designed to stay locked, keeping the 4 x 36 belt running true. the jade 700 is an excellent choice for rough grinding chemistry specimens or quickly de-burring metallographic specimens.

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    Call us 800.545-6566 toll-free from canada, puerto rico and the u.s. virgin islands 800.253.9738 toll-free from mexico 95.800.253.9738 from all other countries 505.839.3011 fax 505.839.3016 mailing address 7500 bluewater rd nw albuquerque, nm 87121 usa

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    On the mohs scale of mineral hardness, jade runs about a 6.0, with diamonds a 10 and mineral talc at the bottom of the scale at a 1. while jade is a relatively medium-hard stone, jade with grains or lines running through it need to be cut and polished with the grain to avoid snapping or breaking it.

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    To polish jade, start by sanding and smoothing it against a polishing wheel. it takes time and experience to learn how much pressure to apply to the stone when holding it against the sanding material. start with a light pressure and increase until you start to see the sanding action work.

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    Hold the jade against the wheel, moving the jade39s direction at least 90 degrees every 10 to 15 seconds, which helps prevent gouges, chips or breaks. it also prevents undercutting of the stone.

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    The small machine footprint of the dd-7 is able to outproduce much larger double disc grinders when the component to be ground is small in diameter. combining the latest in multi-axis slide controls, the machine can be specifically configured for your application. the interface software can be designed to meet your production requirements, encompassing controls for all peripheral attachments such as robots and bowl feeders. in-line inspection can be deployed to automatically size adjust, further improving the machines accuracy and repeatability.

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    The dd-7 uses brushless servo motors versus stepper motors. this is anbspfasternbspand morenbspprecisenbspway of moving slides. a servo-driven, close-looped drive offers the operator a high degree of control over the parts being ground. nbsp0.1 micron linear glass scales coupled with absolute encoders on the axis make the machines faster and highly precise. an available brake dressernbspis equipped withnbspa diamond roll to dress both wheels.

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