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MET 103 Drilling module-2
MET 103 Drilling module-2
MET 103 Drilling module-2
MET 103 Drilling module-2
MET 103 Drilling module-2
MET 103 Drilling module-2
MET 103 Drilling module-2
MET 103 Drilling module-2
MET 103 Drilling module-2
MET 103 Drilling module-2
MET 103 Drilling module-2
MET 103 Drilling module-2
MET 103 Drilling module-2
MET 103 Drilling module-2
MET 103 Drilling module-2
MET 103 Drilling module-2
MET 103 Drilling module-2
MET 103 Drilling module-2
MET 103 Drilling module-2
MET 103 Drilling module-2
MET 103 Drilling module-2
MET 103 Drilling module-2
MET 103 Drilling module-2
MET 103 Drilling module-2
MET 103 Drilling module-2
MET 103 Drilling module-2
MET 103 Drilling module-2
MET 103 Drilling module-2
MET 103 Drilling module-2
MET 103 Drilling module-2
MET 103 Drilling module-2
MET 103 Drilling module-2
MET 103 Drilling module-2
MET 103 Drilling module-2
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MET 103 Drilling module-2

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  1. SAFETY PRECAUTIONS WHEN WORKING WITH DRILL PRESSES• Always wear appropriate safety goggles.• Never leave the chuck key in the drill chuck or the drill drift in the spindle.• Mount the work securely before drilling. Do not hold thin or small pieces in the hands.• Remove chips with a brush or piece of wood. Never use the hands.• Do not attempt to stop the spindle with the hands after turning the machine off. I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET E N T D P A R T ME
  2. SAFETY PRECAUTIONS WHEN WORKING WITH DRILL PRESSES• Keep long sleeves, other loose clothing, and especially long hair away from the revolving spindle or belts. belts• Do not operate the drill with the covers or guards removed.• Keep the work area and floor clean and free of oil and grease. I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET E N T D P A R T ME
  3. Drilling Machine…Drilling is the operation of producing circular hole inthe work-piece by using a rotating cutter called DRILL”.“DRILL”The machine used for drilling is called drillingmachine.The most common drill used is the twist drill. I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET E N T D P A R T ME
  4. TYPES OF DRILL PRESSES1. Sensitive Drill Presses2. Upright Drilling Machines3. Multiple Spindle Head Machines4. The Radial Drilling M hi4 Th R di l D illi Machine5. Gang Drilling Machine I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET E N T D P A R T ME
  5. (1) Sensitive Drilling Machine• Drill holes from 1.5 to 15mm• Operator senses ththe cutting action so sensitive drilling machine I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET E N T D P A R T ME
  6. (2) Up-Right Drilling Machine I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET E N T D P A R T ME
  7. Up-Right Drilling Machine• Similar in design to sensitive type but it is larger & more sturdily built.• It has a gear mechanism used to change the spindle speeds and feeds. i dl d df d• The machine may have mechanical de se to raise e ac e ay a e ec a ca devise a se or lower the work table. I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET E N T D P A R T ME
  8. (3) Radial Drilling MachineIt is thelargest andmostversatileused fordrillingmedium t di tolarge andheavy workpieces. I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET E N T D P A R T ME
  9. (4) MULTIPLE SPINDLE HEAD MACHINES• TWO OR MORE DRILLINGHEADS• EACH HEAD HAS SEVERAL SPINDLES• SEVERAL HOLES CAN BE DRILLED AT A TIME. I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET E N T D P A R T ME
  10. (5) Gang Drilling Machines• A SERIES OF SINGLE SPINDLE DRILLS ARE MOUNTED ON A LONG COMMON TABLE TABLE.• EACH INDIVIDUAL HEAD MAY BE FITTED WITH DIFFERENT CUTTING TOOLS SUCH AS TWIST DRILL, A COUNTER SINK, OR A REAMER• DESIGNED FOR MASS PRODUCTION I NE ER I NG ENG T AL EC MECH NIC HN• NO NEED OF CHANGING OLOGY A MET CUTTING TOOLS. E N T D P A R T ME
  11. Twist DrillsManufactured from three main materialsM f t df th i t i l1. Carbon-tool steels2. High-speed steel g p3. Cemented-carbide TYPES OF TWIST DRILLS 1. General –purpose drill 2. Low-helix drill 3. High-helix drill 4. Core drill 5. Coolant hole drill I NE ER I NG ENG T AL EC MECH NIC HNOLOGY 6. Straight flute drill A MET E N T D P A R T ME
  12. 1. General-Purpose Drill p• Has two Helical flutes• Designed to perform well on wide variety of materials, equipment and job conditions• Can be made to suit different conditions and materials by varying point angle, speeds and feeds• Straight shank Straight-shank drills called general- general purpose jobbers length drills I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET E N T D P A R T ME
  13. 2. Low-Helix Drill• Developed primarily to drill brass and thin materials• Used to drill shallow holes in some aluminum and magnesium alloys• C remove l Can large volume of chips l f hi formed by high rates of penetration I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET E N T D P A R T ME
  14. 3. High-Helix Drills gDesigned for drilling deep holes in aluminum, copper, die-cast material, and other metals – Material where chips have tendency to jam• High helix angle (35º to 45º)• Wider flutes assist in clearing chips from hole I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET E N T D P A R T ME
  15. 4. Core Drill• Three or four flutes• Used to enlarge cored, drilled, or punched holes• Produced in sizes from ¼ to 3 in. I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET E N T D P A R T ME
  16. 5. Oil Hole Drills• Have one or two oil holes running from shank to cutting point – Compressed air, oil, or cutting fluid can be p , , g forced through when deep holes being drilled• C i fl id cools d ill cutting edges Cutting fluid l drills i d and flushes chips out of hole I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET E N T D P A R T ME
  17. 6. Straight-Fluted Drills g• Recommended for drilling operations on soft materials such as brass, bronze, copper and various types of plastic• Straight flute prevents drill from drawing itself into material while cutting I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET E N T D P A R T ME
  18. Types of drills & Applications1.Genearl-purpose1 Genearl purpose A wide variety of matelsdrill2. A low-helix drill Brass & thin matls Shallow holes in Al &Mg alloys3. A high-helix drill Deep holes in low tensile st. matels such as Al, Cu, & plastics4. A core drill To enlarge drilled ,cored or punched holes5. A coolant –hole Screw-m/c and turret lathedrill6. A straight flute Brass, sheet-metal work anddrill nonferrous matels I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET E N T D P A R T ME
  19. Twist Drill Parts 3.Point 2. Body 1. Shank I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET E N T D P A R T ME
  20. Twist Drill Parts I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET E N T D P A R T ME
  21. 1. Drill ShankStraight-shank drillsHeld in drill chuckUp to ½ in in.in diameterTapered-shank drills Fit into internal taper of drill press spindle Tang provided on end to prevent drill from slipping I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET E N T D P A R T ME
  22. 2. Drill Body y• Portion of drill between shank and point p• Consists of number of parts for cutting• Flutes – Two or more helical grooves cut around body of drill – Form cutting edges, admit cutting fluid, allow chips to escape hole I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET E N T D P A R T ME
  23. 3. Drill Point oConsists of chisel edge, lips, lip clearance,and h l d heel.LipsCutting edges formed by intersection of flutes I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET E N T D P A R T ME
  24. Drill-point Angles and Clearances• For general-purpose drilling, the drill point should be ground to an included angle of 118° and lip clearance dt i l d d l f d li l should range from 8° to 12°.• The drill point for hard materials should be ground to an included angle from 135° to 150° and the lip clearance should be from 8° to 10°. 8 10• F drilling soft materials, the drill point should be For d illi ft t i l th d ill i t h ld b ground to an included angle of 90° and the lip clearance ranging from 15° to 18°. I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET E N T D P A R T ME
  25. Four Systems of Drill Sizes• Fractional• Number• Letter L tt• Millimeter (Metric) I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET E N T D P A R T ME
  26. Four Systems of Drill SizesFractionalRange from 1/64 to 4 in. (steps of 1/64th ) I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET E N T D P A R T ME
  27. Four Systems of Drill Sizes• Number – Range from 1 to 97 , .228 in. to .0059 in. I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET E N T D P A R T ME
  28. Four Systems of Drill SizesLetterRange from A to Z (A = .234 in., Z = .413 in.) I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET E N T D P A R T ME
  29. Four Systems of Drill SizesMillimeter (Metric)Straight-shank standard (0.5 to 20 mm) I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET E N T D P A R T ME
  30. CALCULATING RPM METRIC INCH rpm = CS X 320 rpm = CS X 4 D DCS= Cutting speed in meters/mint CS= Cutting speed in feet/mintD= Diameter of Drill in mm D= Diameter of Drill in inch I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET E N T D P A R T ME
  31. SELECTION OF THE PROPER SPEEDS AND FEEDS1. The kind of material being drilled. Softer materials generally are drilled at higher cutting speeds than harder materials2. The kind of cutting tool material. Carbon-steel drills are used with cutting speeds which are about one-half g p those used with high-speed steel drills. Tungsten- carbide drills generally are run at higher speeds and lighter feeds than high-speed steel drills. drills3. Whether or not a cutting fluid is used.4.4 The size and the type of drilling machine used and used, the rigidness of the work setup5. The quality of finish desired in the hole. q y ENG I NE ER I NG T AL EC MECH NIC HNOLOGY A MET E N T D P A R T ME
  32. COUNTERSINKING AND COUNTERBORING COUNTERSINKING :1. It is the process of making a cone-shaped opening at the top of a drilled hole for a flat or an oval head machine screw screw.2. Countersinks may also be used to remove burrs from the top of a drilled hole hole.3. The countersinks or cutting tool used for this operation is available with included angles of 60 and 82°. g I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET E N T D P A R T ME
  33. COUNTERBORING :1. It is the operation of enlarging the top of a l i th t f drilled hole to a given depth.2. The enlarged hole creates a square shoulder which will accommodate a bolt or cap screw head or the shoulder or a pin. I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET E N T D P A R T ME
  34. Drilling operations…Operations that can be p p performed on a drilling machine are 1. Drilling 2. 2 Reaming 3. Boring 4. 4 Counter boring 5. Counter sinking 6. Tapping 6 T i ENG I NE ER I NG T AL EC MECH NIC HNOLOGY A MET E N T D P A R T ME

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