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Questions and Answers
What type of screw should not use a specific type of screwdriver?
What is unique about the swivel knobs on Jewellers' screwdrivers?
What is the approximate length of Jewellers' screwdrivers?
What is the range of widths for Jewellers' screwdriver blades?
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What type of screw is catered for in Jewellers' screwdrivers?
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What are screwdrivers intended to be used for?
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What is the typical material used to construct the handle of a screwdriver?
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What is the purpose of a square section shank on some screwdrivers?
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What type of screwdriver is often referred to as a GS?
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Where are stubby and off-set screwdrivers typically used?
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What should screwdrivers NOT be used for?
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What is the key feature of a flare nut spanner that makes it suitable for confined spaces?
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What is the advantage of a ring/open-ended spanner?
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What type of spanner is used in conjunction with a tommy bar?
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What is the key feature of a ratchet ring spanner that allows for rapid run-down or loosening of nuts or bolts?
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What type of spanner is designed to provide a better grip than an open-ended spanner in confined spaces?
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What is the key feature of a box spanner that makes it suitable for restricted access to the nut or bolt head?
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When using a spanner, what should be ensured regarding the operator's footing?
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What is the correct way to hold a bolt head?
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What should be avoided when using spanners on bolts or nuts?
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What is the correct way to tighten a pipe union?
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Why should the hands and spanners be free from oil or grease?
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What should be done when screwing a fastener into a threaded hole or anchor nut?
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What is the primary advantage of using a metal disintegrator?
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What is the purpose of the water flow in a metal disintegrator?
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Why can broken bolts and studs be removed more easily than broken taps?
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What is the purpose of the left-handed spiral flutes on a tapered screw extractor?
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What should be avoided when using a tapered screw extractor?
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What is the primary function of a screw extractor?
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Study Notes
Screwdrivers and Their Uses
- Using the wrong screwdriver type, such as for an Allen screw, can damage both the screw and the screwdriver.
- Jewellers’ screwdrivers are designed for precision work, featuring swivel knobs and hexagonal shapes to prevent rolling.
- Jewellers’ screwdriver blades range from 0.025 to 0.100 inches (0.6 to 2.5 mm) and are approximately 4 inches (100 mm) in overall length.
Types of Screwdrivers
- Slotted Screwdrivers: Common type consisting of a handle, shank, and blade; the blade is ground to fit the screw slot.
- Handles are typically made from wood or plastic, while blades are constructed from high-carbon or alloy steel.
- Screwdrivers are classified by shank length and blade width, with large screwdrivers sometimes featuring square section shanks for added torque.
Appropriate Uses for Screwdrivers
- Screwdrivers should only be used for tightening or loosening screws, not for chiseling, punching, or prying.
- Stubby and off-set screwdrivers are designed for use in restricted access areas.
Spanners and Wrenches
- A combination spanner combines a bi-hexagonal end with an open end for versatility, often used with an inclined open jaw.
- Flare nut spanners have a gap to allow access to restricted areas while providing a better grip than open-ended spanners.
- Box spanners provide full enclosure of nuts or bolts, ideal for restricted access aligned with screw axes.
Ratchet Ring Spanners
- Ratchet ring spanners allow rapid loosening or tightening without removal after each stroke; they may have different sizes at each end.
- Adjustable spanners and wrenches should be avoided on aircraft components but are suitable for tooling adjustments.
Best Practices for Using Spanners
- Always hold bolt heads firm with one spanner while moving the corresponding nut with another.
- Maintain a firm footing and ensure hands and spanners are free of oil or grease to prevent slipping hazards.
Metal Disintegrator
- A metal disintegrator is effective for removing taps, utilizing a hollow electrode to burn through while cooling with water; suitable for various electrode sizes.
Removing Broken Bolts and Studs
- Broken bolts and studs are typically easier to remove than hardened taps, utilizing screw extractors.
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Screw Extractors:
- Available in tapered and straight types; tapered screw extractors feature left-handed spiral flutes.
- Inserted into a drilled hole, they tighten upon turning anti-clockwise, allowing the broken bolt to be unscrewed without excessive force.
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Description
Learn about the different types of screwdrivers, including slotted and recessed screw heads, and their uses in maintenance practices. Understand the importance of using screwdrivers correctly and safely.
