This Drill Point Sharpening Gage is offered complimentary in the following books: Engineers Black Book - 2st Edition Engineers Black Book - USA Edition All other Engineers Black Book Language Editionsįor all inquiries regarding this Drill Point Sharpening Gage: Click HereĬopyright © 2016 Hi Impact Supplies. Lips of UNEQUAL lengths and UNEQUAL angles This puts severe strain on the drill bit causing rapid wear and premature drill failure. When properly sharpened, the chips will come out of the flutes in curled spirals of equal length Incorrect grinding causes the drill bit to run out of true, producing oversized and often, out-of-round holes. Step 3 // Drill Test and the Effects of incorrect grinding of the Drill Point To test whether a drill has been properly sharpened, drill a hole in soft material and observe the chip formation. The ultimate ENGINEERS reference sheets, formulae, reference tables,equivalent charts and wealth of up-to-date. Step 2 // Line Drill up with Gage against desired Tip Angle The DRILL POINT SHARPENING GAGE is the tool most frequently used to check the drill point during the sharpening operation Roughing The periphery of the wheel should be used for roughing-out of the drill point if much metal must be ground away Points to Note: Keep the drill point constantly sharp Avoid excessive grinding pressures Avoid overheating the drill point Avoid sudden cooling of the drill point Use copious supply of coolantįinishing The side of the wheel should be used for finishing This Drill Point Sharpening Gage is offered complimentary in each Engineers Black BookĭRILL POINT SHARPENING METHODOLOGY Step 1 // Hints for Hand Grinding Twist Drills Procedure: The left hand thumb and forefinger is used as a pivot as illustrated and the back of the drill is held with the right hand and forefinger and rotated in a clockwise direction advancing the drill into the grinding wheel. Engineers Black Book - 3rd Edition INCH (Large Work Bench Edition 9.75in High x 5.5in Wide) Machinist Reference Book. Engineers Black Book: Machinist and Manufacturing Reference Book

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