30 Questions
What is the primary purpose of selecting the correct rivet set for the job?
To prevent damage to the rivet or the material to be fastened
What is the term used to describe the formation of the rivet head when using a rivet gun and set?
Shop head
What is the advantage of using a squeeze riveter over a rivet gun?
Reduced time required to produce a uniform row of rivets
What is the function of the dollies in a squeeze riveter?
To form the shop head
What is an important safety precaution when using a rivet gun?
Never aim a rivet gun at any person
What is the purpose of the bucking bar in a rivet gun?
To form the shop head of the rivet
What is the primary reason to disconnect tools when not in use?
To prevent accidental starting
Why should workers avoid holding a finger on the switch button while carrying a plugged-in tool?
To prevent accidental starting
What is the most serious danger associated with using electric tools?
Electrocution
What should be done to a portable electric tool that is damaged?
Remove it from use and tag it ‘Do Not Use’
Why should loose clothing, ties, or jewellery be avoided when using electric tools?
They can get caught in moving parts
Why is it important to keep electric tools sharp and clean?
To improve tool performance
What is the recommended technique when using a drill?
Apply enough pressure to keep the drill bit cutting smoothly
What is the purpose of the metal guard on a bench grinder?
To protect the operator from the abrasive wheel shattering
What is the primary use of a bench grinder?
For off-hand grinding of small jobs and tools
What should you do if the drill slows down during operation?
Relieve the pressure on the drill bit
What is the potential consequence of forcing a drill?
The motor will overheat and the drill bit may be damaged
Where can you find information about the specific type of grinding wheel required for a particular job?
In handbooks available from the makers and their agents
What is the most important factor in determining the efficient drilling speed?
Type of work materials and drill diameter
What is the unit of measurement for drill speed?
Surface feet per minute
What is the recommended drill speed for a 10 mm drill diameter?
970 rpm
Why should a small-diameter drill be run at a faster speed than a large-diameter drill?
Because it is more efficient
What is the general rule for drill speed when cutting different metals?
Drills should be run faster for soft metals and slower for hard metals
What is the purpose of the drill speed table provided?
To provide general guidelines for drill speeds for common materials
What is the primary reason to keep the drill cutting and not just rubbing?
To prevent overheating and becoming blunt
What type of lubricant is recommended for drilling cast iron?
Dry
What is the purpose of drilling a pilot hole when drilling large holes?
To prevent the metal from splitting
Why should you wear eye protection when drilling?
To protect your eyes from flying debris
What should you do before drilling a hole?
All of the above
What type of lubricant is recommended for drilling stainless steel?
Soluble oil
Study Notes
Electric Power Tools Safety Precautions
- Disconnect tools when not in use, before servicing, and when changing accessories like blades, bits, and cutters.
- Keep observers at a safe distance from the work area.
- Secure work with clamps or a vice to free both hands to operate the tool.
- Avoid accidental starting by not holding fingers on the switch button while carrying a plugged-in tool.
- Maintain tools with care by keeping them sharp and clean for the best performance.
- Follow instructions in the user's manual for lubricating and changing accessories.
Rivet Guns Safety Precautions
- Select the correct rivet set for the job to prevent damage to the rivet or material.
- Never aim a rivet gun at any person.
- Bucking bars (dollies) are available in various sizes and shapes, according to rivet size and access to the tail.
Squeeze Riveting
- Squeeze riveters are used for driving a large number of rivets along the edge of a sheet or in a stringer.
- A squeeze riveter consists of a pair of jaws: one stationary and the other moved by a piston in an air cylinder.
Drilling
- The most efficient drilling speed depends on variables like type and hardness of the material, diameter and material of the drill, and type and condition of the drill press.
- Cutting speeds for various materials are listed in the drill speed table.
- A small-diameter drill should be run at a faster speed than a large-diameter drill when cutting the same metal.
- Drills should be run faster when cutting soft metals, such as aluminum, than when cutting hard metals, such as mild steel.
- Do not force a drill and apply enough pressure to keep the drill bit cutting smoothly.
Bench Grinders
- A bench grinder is normally mounted to a bench and is fitted with a grinding wheel on each end of the shaft.
- The abrasive wheels must not be operated without guards securely in place.
- Bench grinders are used for off-hand (or hand-guided) grinding of small jobs and tools.
Drill Lubricants
- A suitable lubricant should be used to keep the drill cool and to assist swarf escaping up the flutes of the drill.
- Lubricants suitable for use with a range of metals are:
- Mild steel: soluble oil
- High-carbon steel: soluble oil
- Copper and brass: kerosene
- Cast iron: worked dry
- Aluminum: kerosene
- Stainless steel: soluble oil
Drilling Procedures
- Key steps for drilling a part include:
- Selecting the correct size drill
- Checking the speed
- Holding work securely
- Checking that the drill hole is on-centre
- Feeding the drill slowly through the metal
- Cleaning up
- Safety checks when drilling include:
- Wearing eye protection
- Only one person operating the press drill
- Not holding metal in your bare hand when drilling
- Drilling a pilot hole for holes of a diameter greater than 10 mm
- Using a suitable lubricant to prevent build-up of heat
Learn the essential safety guidelines for operating power tools, including disconnecting tools when not in use, maintaining a safe distance, and proper tool maintenance. Ensure a safe working environment and prevent accidents. Improve your knowledge of power tool safety and best practices.
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