Holding

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  • Holding

    1. 1. Holding Devices Session 11 1
    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 2
    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 3
    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 4
    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 5
    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 6
    7. 7. Types of Drill Chucks • Keyless • Chuck loosened or tightened by hand without key • Precision keyless • Holds smaller drills accurately 7
    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 8
    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 9
    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 10
    11. 11. Drill Drifts 11
    12. 12. Drill Drifts 12
    13. 13. Drill Drift 13
    14. 14. Drill Drift Rounded edge up 14
    15. 15. Work-Holding Devices • Angle vise • Angular adjustment on base to allow operator to drill holes at an angle without tilting table 15
    16. 16. Work-Holding Devices • Drill Press Vise • Used to hold round, square or odd-shaped rectangular pieces • Clamp vise to table for stability 16
    17. 17. Work-Holding Devices • Drill Press Vise 17
    18. 18. Work-Holding Devices • Drill Press Vise 18
    19. 19. Work-Holding Devices • Drill Press Vise 19
    20. 20. Work-Holding Devices • Drill Press Vise 20
    21. 21. Work-Holding Devices • V-blocks • Made of cast iron or hardened steel • Used in pairs to support round work for drilling 21
    22. 22. Work-Holding Devices • Step blocks • Used to provide support for outer end of strap clamps • Various sizes and steps 22
    23. 23. Work-Holding Devices 23
    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 24
    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 25
    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 26
    27. 27. Work-Holding Devices Finger clamp U-clamp Straight clamp 27
    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 28
    29. 29. Clamping Hints 1. Always place bolt close to workpiece 2. Have packing block slightly higher than work surface being clamped 3. Place metal shim between clamp and workpiece 4. Use sub-base or liner under rough casting 5. Shim parts that do not lie flat to prevent rocking 29

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