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Drilling Machines PowerPoint Presentation

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Slide 1 - Drilling Machines Section 10
Slide 2 - 38-2 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 - Drill Presses Unit 38
Slide 4 - 38-4 Objectives Identify six standard operations that may be performed on a drill press Identify four types of drill presses and their purposes Name and state the purpose of the main parts of an upright and a radial drill
Slide 5 - 38-5 Drilling 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 6 - 38-6 Standard Operations Drilling Operation of producing hole by removing metal from solid mass using twist drill Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Countersinking Operation of producing tapered or cone-shaped enlargement to end of hole
Slide 7 - 38-7 Standard Operations Reaming Operation of sizing and producing smooth, round hole from previously drilled or bored hole Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Boring Truing and enlarging hole by means of single-point cutting tool
Slide 8 - 38-8 Standard Operations Tapping Cutting internal threads in hole with cutting tool called tap Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Counterboring Enlarging top of previously drilled hole to given depth to provide square shoulder for head of bolt or capscrew
Slide 9 - 38-9 Standard Operations 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 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
Slide 10 - 38-10 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 11 - 38-11 Sensitive Drill Press Parts Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Only hand feed mechanism Control downfeed pressure Manufactured in bench and floor model Four main parts Base, column, table and drilling head
Slide 12 - 38-12 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 13 - 38-13 Sensitive Drill Press Parts Table Round or rectangle 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 14 - 38-14 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 Multispindle head can be used (20+ spindles)
Slide 15 - 38-15 Radial Drilling Machine 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 16 - 38-16 Radial Drilling Machine Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
Slide 17 - 38-17 Radial Drilling Machine 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 18 - 38-18 Radial Drilling Machine 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
 

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