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1:40 or 50 (depending upon the grinding wheel) and is used for grinding the following materials. oCast iron or hardened steel oSoft steel oConnected carbide tools (using silicon wheel) In India we use IOC Servocut oils as cutting fluid. There is a special grade oil manufactured by IOC for grinding alone. It is called Servocut - clear.


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The machine featured a large, belt-driven drive wheel and represented a major advance in both construction and efficiency over its predecessor. Unlike the earlier Family Grind Stone, the No. 2 was a one-stone machine. Its single …


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Photographer: Michael Vanden Berg. Moqui marbles are small, brownish-black balls composed of iron oxide and sandstone that formed underground when iron minerals precipitated from flowing groundwater. They occur in many places in …


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The research program included grinding tests of two lithological types of Polish copper ore (dolomite and sandstone) and their mixtures in the proportions: 70% dolomite +30% sandstone and 30% ...


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Here we report studies of three sandstone grinding stones from the Holocene levels of the site, one associated with a radiocarbon age of 690 cal. BP, and the others with an age of 8320 cal. BP.


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Sandstone grinding slab from McMullen County vicinity, both sides shown. This material is relatively hard and well-cemented with fairly coarse sand grains. At the top is the working surface, a slightly concave ground surface upon …


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Matched pair of sandstone arrow shaft abraders Ground stone technology also was used to produce artifacts of personal adornment. Gorgets, beads, and ear spools enhanced the appearance of the bearer and perhaps functioned as …


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The use of stone grinding tools by indigenous groups including Luiseño, Juaneño, Kumeyaay, Cahuilla, and Cupeño Indians continued after European contact into the early 20th century and later in some parts of the area. 2.2. Archaeological context of non-local appearing sandstone cobbles used as handstones