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Published on : Jan 08, 2015
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Slide 1 - Drill Presses Session 8
Slide 2 - Shop Tools and Techniques 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
Slide 3 - 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
Slide 4 - Shop Tools and Techniques 4 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
Slide 5 - Shop Tools and Techniques 5 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
Slide 6 - Shop Tools and Techniques 6 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
Slide 7 - 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 cutting tool Pilot section on end to fit into existing hole
Slide 8 - 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
Slide 9 - Shop Tools and Techniques 9 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
Slide 10 - 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
Slide 11 - 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
Slide 12 - Shop Tools and Techniques 12 Sensitive Drill
Slide 13 - Shop Tools and Techniques 13 Sensitive Drill
Slide 14 - Shop Tools and Techniques 14 Sensitive Drill
Slide 15 - 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
Slide 16 - Shop Tools and Techniques 16 Upright Drill Press
Slide 17 - Shop Tools and Techniques 17 Upright Drill Press
Slide 18 - 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
Slide 19 - Shop Tools and Techniques 19 Radial Drill
Slide 20 - Shop Tools and Techniques 20 Radial Drill
Slide 21 - 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
Slide 22 - 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
Slide 23 - Shop Tools and Techniques 23 Radial Drill
Slide 24 - Shop Tools and Techniques 24 Radial Drill
Slide 25 - Shop Tools and Techniques 25 Radial Drill
Slide 26 - Shop Tools and Techniques 26 Radial Drill