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Drilling Machine Accessories Skilled Trades Math PowerPoint Presentation

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Slide 1 - 1 Drilling Machine Accessories Session 11
Slide 2 - 2 Versatility of the Drill Press Greatly increased by various accessories Two categories Tool-holding devices Used to hold or drive cutting tool Work-holding devices Used to clamp or hold workpiece
Slide 3 - 3 Tool-Holding Devices Drill press spindle provides means of holding and driving cutting tool End may be tapered or threaded for mounting drill chuck Most common Drill chucks Drill sleeves Drill sockets
Slide 4 - 4 Drill Chucks Most common devices used for holding straight-shank cutting tools Most contain three jaws that move simultaneously when outer sleeve turned Hold straight shank of cutting tool securely Two common types Key Keyless
Slide 5 - 5 Chucks Hold straight-shank drills Mounted on drill press spindle Taper Threads Held in spindle by self-holding taper in larger machines Four types of drill chucks
Slide 6 - 6 Types of Drill Chucks Key-type Most common Three jaws move simultaneously when outer sleeve turned Tighten with key Different size keys for different size chucks
Slide 7 - 7 Types of Drill Chucks Keyless Chuck loosened or tightened by hand without key Precision keyless Holds smaller drills accurately
Slide 8 - 8 Types of Drill Chucks Jacobs impact keyless chuck Hold small or large drills using Rubber-Flex collets Gripped or released quickly and easily by means of built-in impact device in chuck
Slide 9 - 9 Drill Sleeves and Sockets Drill Sleeves Used to adapt drill shank to machine spindle if taper on tool is smaller than taper in spindle Drill Socket Used when hole in spindle of drill press too small for taper shank of drill Used often as extension sockets
Slide 10 - 10 Drill Drift Used to remove tapered-shank drills or accessories from drill press spindle Always place rounded edge up so this edge will bear against round slot in spindle Use hammer to tap drill drift and loosen tapered drill shank Use board or piece of pressed-wood to protect table or vise
Slide 11 - 11 Drill Drifts
Slide 12 - 12 Drill Drifts
Slide 13 - 13 Drill Drift
Slide 14 - 14 Drill Drift Rounded edge up
Slide 15 - 15 Work-Holding Devices Angle vise Angular adjustment on base to allow operator to drill holes at an angle without tilting table
Slide 16 - 16 Work-Holding Devices Drill Press Vise Used to hold round, square or odd-shaped rectangular pieces Clamp vise to table for stability
Slide 17 - 17 Work-Holding Devices Drill Press Vise
Slide 18 - 18 Work-Holding Devices Drill Press Vise
Slide 19 - 19 Work-Holding Devices Drill Press Vise
Slide 20 - 20 Work-Holding Devices Drill Press Vise
Slide 21 - 21 Work-Holding Devices V-blocks Made of cast iron or hardened steel Used in pairs to support round work for drilling
Slide 22 - 22 Work-Holding Devices Step blocks Used to provide support for outer end of strap clamps Various sizes and steps
Slide 23 - 23 Work-Holding Devices
Slide 24 - 24 Work-Holding Devices Angle plate L-shaped piece of cast iron or hardened steel machined to accurate 90º May be bolted or clamped to table Variety of sizes
Slide 25 - 25 Work-Holding Devices Drill jigs Used in production for drilling holes in large number of identical parts Eliminate need for laying out a hole location
Slide 26 - 26 Work-Holding Devices Clamps or straps Used to fasten work to table or angle plate for drilling Various sizes Usually supported at end by step block and bolted to table by T-bolt that fits into table T-slot
Slide 27 - 27 Work-Holding Devices Finger clamp U-clamp Straight clamp
Slide 28 - 28 Clamping Stresses Don’t want stresses to cause springing or distortion of workpiece Clamping pressures should be applied to work, not step block Step block should be slightly higher than work Bolt close to work
Slide 29 - 29 Clamping Hints Always place bolt close to workpiece Have packing block slightly higher than work surface being clamped Place metal shim between clamp and workpiece Use sub-base or liner under rough casting Shim parts that do not lie flat to prevent rocking
 

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