1. Drill Presses Session 8

2. Shop Tools and Techniques2 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

3. Shop Tools and Techniques3 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

4. Shop Tools and Techniques4 Standard Operations Drilling Operation of producing hole by removing metal from solid mass using twist drill Countersinking Operation of producing tapered or cone-shaped enlargement to end of hole

5. Shop Tools and Techniques5 Standard Operations Reaming Operation of sizing and producing smooth, round hole from previously drilled or bored hole Boring Truing and enlarging hole by means of single-point cutting tool

6. Shop Tools and Techniques6 Standard Operations Tapping Cutting internal threads in hole with cutting tool called tap Counterboring Enlarging top of previously drilled hole to given depth to provide square shoulder for head of bolt or capscrew

7. Shop Tools and Techniques7 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 cutting tool Pilot section on end to fit into existing hole

8. Shop Tools and Techniques8 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

9. Shop Tools and Techniques9 Sensitive Drill Press Parts Hand feed lever Controls downfeed pressure Feel the pressure Manufactured in bench and floor model Four main parts Base, column, table and drilling head

10. Shop Tools and Techniques10 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

11. Shop Tools and Techniques11 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

12. Shop Tools and Techniques12 Sensitive Drill

13. Shop Tools and Techniques13 Sensitive Drill

14. Shop Tools and Techniques14 Sensitive Drill

15. Shop Tools and Techniques15 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

16. Shop Tools and Techniques16 Upright Drill Press

17. Shop Tools and Techniques17 Upright Drill Press

18. Shop Tools and Techniques18 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

19. Shop Tools and Techniques19 Radial Drill

20. Shop Tools and Techniques20 Radial Drill

21. Shop Tools and Techniques21 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

22. Shop Tools and Techniques22 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

23. Shop Tools and Techniques23 Radial Drill

24. Shop Tools and Techniques24 Radial Drill

25. Shop Tools and Techniques25 Radial Drill

26. Shop Tools and Techniques26 Radial Drill