3.1 Identification and Use of Common Hand Tools
Key Concepts
- Screwdrivers
- Wrenches
- Pliers
- Hammers
- Measuring Tools
Screwdrivers
Screwdrivers are essential for turning screws. They come in various types, including flathead and Phillips head. Flathead screwdrivers are used for screws with a straight slot, while Phillips head screwdrivers are used for screws with a cross-shaped slot. Proper use involves selecting the correct size and type of screwdriver to avoid damaging the screw or the tool.
Wrenches
Wrenches are used for tightening or loosening bolts and nuts. Common types include open-end wrenches, box-end wrenches, and adjustable wrenches. Open-end wrenches have a single opening, while box-end wrenches have a closed loop. Adjustable wrenches can adjust to fit different sizes. Proper use involves selecting the correct size and applying even pressure to avoid slipping.
Pliers
Pliers are versatile tools used for gripping, cutting, and bending. Common types include needle-nose pliers, slip-joint pliers, and cutting pliers. Needle-nose pliers are ideal for reaching tight spaces, while slip-joint pliers can adjust to different sizes. Cutting pliers are used for cutting wires and small metal pieces. Proper use involves selecting the correct type and applying controlled pressure.
Hammers
Hammers are used for driving nails and shaping metal. Common types include claw hammers and ball-peen hammers. Claw hammers have a curved claw for removing nails, while ball-peen hammers have a rounded end for shaping metal. Proper use involves holding the hammer correctly and striking the target with the correct force to avoid damage.
Measuring Tools
Measuring tools are essential for precise measurements. Common types include tape measures, calipers, and micrometers. Tape measures are used for linear measurements, while calipers and micrometers provide more precise measurements for smaller objects. Proper use involves ensuring the tool is calibrated and reading the measurements accurately.
Examples and Analogies
Screwdrivers
Using a screwdriver is like using a key to unlock a door. Just as you need the correct key for a specific lock, you need the correct screwdriver for a specific screw.
Wrenches
A wrench is like a pair of hands that can grip and turn. Just as you use your hands to turn a lid, you use a wrench to turn a bolt or nut.
Pliers
Pliers are like an extra set of fingers. They can grip, cut, and bend, making them versatile tools for various tasks.
Hammers
A hammer is like a fist that delivers a precise strike. Just as you use your fist to tap something gently, you use a hammer to drive nails or shape metal.
Measuring Tools
Measuring tools are like a ruler for your work. Just as you use a ruler to measure paper, you use measuring tools to ensure precise measurements in your tasks.