suggesteddrillingfeedrateschart.pdf Suggested Drilling Feed Rates (inches per rev.) MATERIAL BRINELL HARDNESS HOLE DIAMETER 1/16″ 1/8 1/4 1/2 3/4 1 1 1/2 2 Aluminum 99-101 .001 .003 .007 .012 .016 .020 .025 .030 Aluminum Bronze 170-187 .001 .003 .004 .008 .010 .012 .015 .020 Balkelite – .002 .005 .006 .008 .010 .012 .015 .015 Brass 192-202… Continue reading Suggested Drilling Feed Rates
View detailsRecommendedDrillHeadPressureChart.pdf Recommended Drill Head Pressure HK Diamond Core Drill Bits Material Recommended Drill Head Pressure (lbs.)* Fiberglass 10 to 15 lbs. Limestone & Marble Stone 12 to 18 lbs. Glass, Ceramic & Porcelain China 12 to 18 lbs. Ceramic/Porcelain Wall Tile 15 to 20 lbs. Stone Style Porcelain Floor Tile 18 to 30 lbs. Granite… Continue reading Recommended Drill Head Pressure
View detailsHardnessScaleChart.pdf Knoop Hardness Scale Material Wood – Pine 10 Copper 120 Limestone 125 – 150 Marble 140 – 180 Slate 140 – 250 Porcelain Fixtures & China 400 – 500 Glass & Ceramic 400 – 550 Ceramic Wall Tile 450 – 550 Porcelain Wall Tile 500 – 650 Porcelain Floor Tile 500 – 650 Marble… Continue reading Hardness Scale Chart
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