Drill Accessories

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Drilling MachineAccessories

Session 11


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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


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Tool-Holding Devices

Drill press spindle provides means ofholding and driving cutting tool

End may be tapered or threaded for

mounting drill chuck Most common

Drill chucks

Drill sleeves Drill sockets


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Drill Chucks

Most common devices used for holdingstraight-shank cutting tools

Most contain three jaws that move

simultaneously when outer sleeveturned

Hold straight shank of cutting tool securely

Two common types Key

Keyless


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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


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Types of Drill Chucks

Key-type

Most common

Three jaws move

simultaneouslywhen outer sleeveturned

Tighten with key

Different size keys fordifferent size chucks


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Keyless

Chuck loosened ortightened by

hand without key Precision keyless

Holds smaller drillsaccurately


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Jacobs impact keyless chuck

Hold small or large drillsusing Rubber-Flexcollets

Gripped or releasedquickly and easily bymeans of built-inimpact device in chuck


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Drill Sleeves and Sockets

Drill Sleeves

Used to adapt drillshank to machine

spindle if taper on tool issmaller than taper in spindle

Drill Socket

Used when hole in spindle of drill press toosmall for taper shank of drill

Used often asextension sockets


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Drill Drift

Used to remove tapered-shank drills oraccessories from drill press spindle

Always place rounded edge up so this

edge will bear against round slot inspindle

Use hammer to tap drill drift and loosen

tapered drill shank Use board or piece of pressed-wood to

protect table or vise


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Drill Drifts


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Drill Drifts


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Drill Drift


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Drill Drift

Rounded

edge up


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Work-Holding Devices

Angle vise

Angular adjustment on base to allowoperator to drill holes at an angle without

tilting table


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Drill Press Vise

Used to hold round, square or odd-shapedrectangular pieces

Clamp vise to table for stability


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Drill Press Vise


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Drill Press Vise


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Drill Press Vise


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Drill Press Vise


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V-blocks Made of cast iron or

hardened steel

Used in pairs tosupport round work fordrilling


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Step blocks Used to provide

support for outerend of strap clamps

Various sizes andsteps


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Angle plate

L-shaped piece ofcast iron orhardened steelmachined toaccurate 90

May be bolted orclamped to table

Variety of sizes


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Drill jigs

Used in production for drilling holes in largenumber of identical parts

Eliminate need for laying out a hole location


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Clamps or straps

Used to fasten work to table orangle plate for drilling

Various sizes Usually supported at

end by step block andbolted to table by T-bolt

that fits into table T-slot


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Finger clamp

U-clamp

Straight clamp


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Clamping Stresses

Dont 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


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Clamping Hints

1. Always place bolt close toworkpiece

2. Have packing block slightly higher

than work surface being clamped3. Place metal shim between clampand workpiece

4. Use sub-base or liner under rough

casting5. Shim parts that do not lie flat to

prevent rocking

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Drill Accessories