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Drill Presses

Drill Presses. Session 8. Drilling Machines. Probably first mechanical device developed Principle of rotating tool to make hole One of most common and useful machines in industry Come in several types and sizes From hand-fed to computer-controlled. Drill Press. Drilling machine Spindle

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Drill Presses

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  1. Drill Presses Session 8

  2. Drilling Machines • Probably first mechanical device developed • Principle of rotating tool to make hole • One of most common and useful machines in industry • Come in several types and sizes • From hand-fed to computer-controlled Shop Tools and Techniques

  3. Drill Press • Drilling machine • Spindle • Turns drill to advance into work (hand or automatically) • Work table • Holds workpiece rigidly in place as hole drilled • Used primarily to produce holes in metal • Other operations: tapping, reaming, boring, counterboring, countersinking, spot-facing Shop Tools and Techniques

  4. Standard Operations • Drilling • Operation of producing hole byremoving metal from solid massusing twist drill • Countersinking • Operation of producing taperedor cone-shaped enlargementto end of hole Shop Tools and Techniques

  5. Standard Operations • Reaming • Operation of sizing and producingsmooth, round hole from previously drilled or bored hole • Boring • Truing and enlarging hole by means of single-point cutting tool Shop Tools and Techniques

  6. Standard Operations • Tapping • Cutting internal threads in hole with cutting tool called tap • Counterboring • Enlarging top of previouslydrilled hole to given depthto provide square shoulder for head of bolt or capscrew Shop Tools and Techniques

  7. Standard Operations • Spot-Facing • Smoothing and squaring surface around hole to provide seat for head of cap screw or nut • Boring bar fitted with double-edged cuttingtool • Pilot section on endto fit into existing hole Shop Tools and Techniques

  8. Principal Types of Drilling Machines • Wide variety of drill presses • Size of drill press may be designated in different ways by different companies • Some state size as distance from center of spindle to column of machine • Others state size by diameter of largest circular piece that can be drilled in center Shop Tools and Techniques

  9. Sensitive Drill Press Parts • Hand feed lever • Controls downfeedpressure • Feel the pressure • Manufactured in bench and floor model • Four main parts • Base, column, tableand drilling head Shop Tools and Techniques

  10. Sensitive Drill Press Parts • Base • Provides stability for machine • Cast iron with holes to be bolted to table or bench • Slots or ribs in base allow work-holding device or workpiece to be fastened • Column • Accurate cylindrical post that fits in base • Table may be adjusted any point (base to head) • Drill press head mounted near top Shop Tools and Techniques

  11. Sensitive Drill Press Parts • Table • Round or rectangle shaped • Used to support workpiece to be machined • Surface 90º to column (move around) • Drilling Head • Mechanism used to revolve cutting tool • Spindle: round shaft holds cutting tool • Quill: houses spindle Shop Tools and Techniques

  12. Sensitive Drill Shop Tools and Techniques

  13. Sensitive Drill Shop Tools and Techniques

  14. Sensitive Drill Shop Tools and Techniques

  15. Upright Drilling Machine • Larger and heavier • Differences from sensitive-type drill • Equipped with gearbox for variety of speeds • Spindle may be advanced by: hand lever, handwheel, and automatically by feed mechanism • Table raised or lowered by mechanism • Some have reservoir in base for coolant storage Shop Tools and Techniques

  16. Upright Drill Press Shop Tools and Techniques

  17. Upright Drill Press Shop Tools and Techniques

  18. Radial Drill • Sometimes called radial-arm drill • Advantages of this machine • Larger and heavier work may be machined • Drilling head raised or lowered • Drilling head moves rapidly to any desired location while workpiece remains clamped • More power • Head may swivel so holes can be drilled on angle Shop Tools and Techniques

  19. Radial Drill Shop Tools and Techniques

  20. Radial Drill Shop Tools and Techniques

  21. Radial Drill Parts • Base • Heavy, box-type, ribbed cast iron or welded steel • Used to bolt machine to floor and provide coolant reservoir • Table may be bolted to base for small work • Column • Upright cylindrical member fitter to base • Supports radial arm at right angles Shop Tools and Techniques

  22. Radial Drill Parts • Radial arm • Attached to column • May be raised and lowered by means of power-driven elevating screw • Supports drive motor and drilling head • Drilling head • Mounted on arm and moved along length of arm by traverse handwheel • Drill spindle may be raised or lowered Shop Tools and Techniques

  23. Radial Drill Shop Tools and Techniques

  24. Radial Drill Shop Tools and Techniques

  25. Radial Drill Shop Tools and Techniques

  26. Radial Drill Shop Tools and Techniques

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