Holding
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The document discusses various tool-holding and work-holding devices that can be used with a drill press to increase its versatility. It describes common tool-holding devices like drill chucks, sleeves, and sockets that are used to hold cutting tools. It also outlines different types of work-holding devices like vises, angle plates, clamps, and jigs that are used to securely hold workpieces for drilling. It provides details on properly applying clamping stresses and techniques to avoid distortion of the workpiece.
Holding
- 1. Holding Devices Session 11
- 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
- 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
- 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
- 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
- 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
- 7. Types of Drill Chucks Keyless Chuck loosened or tightened by hand without key Precision keyless Holds smaller drills accurately
- 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
- 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
- 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
- 11. Drill Drifts
- 12. Drill Drifts
- 13. Drill Drift
- 14. Drill Drift Rounded edge up
- 15. Work-Holding Devices Angle vise Angular adjustment on base to allow operator to drill holes at an angle without tilting table
- 16. Work-Holding Devices Drill Press Vise Used to hold round, square or odd-shaped rectangular pieces Clamp vise to table for stability
- 17. Work-Holding Devices Drill Press Vise
- 18. Work-Holding Devices Drill Press Vise
- 19. Work-Holding Devices Drill Press Vise
- 20. Work-Holding Devices Drill Press Vise
- 21. Work-Holding Devices V-blocks Made of cast iron or hardened steel Used in pairs to support round work for drilling
- 22. Work-Holding Devices Step blocks Used to provide support for outer end of strap clamps Various sizes and steps
- 24. Work-Holding Devices Angle plate L-shaped piece of cast iron or hardened steel machined to accurate 90 º May be bolted or clamped to table Variety of sizes
- 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
- 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
- 27. Work-Holding Devices Finger clamp U-clamp Straight clamp
- 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
- 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
Editor's Notes
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