Drilling Machine Accessories

1. Drilling Machine Accessories 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 simultaneouslywhen outer sleeve turned • Tighten with key • Different size keys for different size chucks

7. Types of Drill Chucks • Keyless • Chuck loosened or tightened byhand without key • Precision keyless • Holds smaller drills accurately

8. Types of Drill Chucks • Jacobs impact keyless chuck • Hold small or large drillsusing Rubber-Flexcollets • Gripped or releasedquickly and easily bymeans of built-inimpact device in chuck

9. Drill Sleeves and Sockets • Drill Sleeves • Used to adapt drillshank to machinespindle if taper on tool issmaller 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-shapedrectangular 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

23. Work-Holding Devices

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

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 atend by step block andbolted to table by T-boltthat 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