Cold Chisel Materials and Cutting Action

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Questions and Answers

What is the purpose of a flat chisel?

Cutting off rivet heads

Chipping flat surfaces, trimming castings and forging, and cutting thin metal (correct)

Cutting angles of 700 or more

Chiseling in positions inaccessible to a flat chisel

What is the effect of a cutting angle that is too large?

The metal will build up in front and the chip will not curl off (correct)

The chisel will require more frequent sharpening

The chip will curl off due to the loss of wedging action

The chisel will dig into the metal even with the minimum angle of relief

What is the purpose of a side cutting chisel?

Trimming castings and forging

Cutting off rivet heads

Chiseling in positions inaccessible to a flat chisel (correct)

Chipping flat surfaces

What is the preferred cutting edge for most work in a flat chisel?

Slightly convex Signup and view all the answers

What is the effect of a cutting angle that is too small?

The chisel tends to dig into the metal even with the minimum angle of relief Signup and view all the answers

What is the typical cutting angle of a flat chisel?

60° Signup and view all the answers

What is the purpose of draw filing?

To produce a good appearance by removing scratches and leaving an even-grained finish Signup and view all the answers

What is pinning of files?

When metal particles become embedded in the file teeth Signup and view all the answers

What is the effect of pinning on the file?

Causes deep scratches and reduces the efficiency of the file Signup and view all the answers

Why does pinning tend to occur when filing soft metals?

Because soft metals chips cannot clear easily Signup and view all the answers

How can pinning be reduced?

By relying on frequent cleaning to remove pins and dirt Signup and view all the answers

What happens when a file is not cleaned often?

It acts like a dull file Signup and view all the answers

How should the drill be laid down when not in use?

Gently in a secure resting place Signup and view all the answers

What should be checked before using an electric drill?

The condition of the drill, including the power lead and casing Signup and view all the answers

Why is it essential to use a three-pin plug with an electric drill?

To ensure the earth return lead is securely connected Signup and view all the answers

What should you do if the drill's insulation is damaged?

Report the damage and do not use the drill Signup and view all the answers

How should the drill be gripped and held?

Firmly, with both hands Signup and view all the answers

What is a safety precaution to be taken while chiselling?

Using goggles and chipping screen Signup and view all the answers

What is the purpose of a rough grinding wheel in chiselling?

To remove the 'mushroom head' of the chisel Signup and view all the answers

What should you do at the break-through point when using an electric drill?

Apply very light pressure to ensure a clean break-through Signup and view all the answers

What is the characteristic of double cut files?

They have teeth formed by a double set of parallel chisel cuts that cross each other diagonally Signup and view all the answers

What is the purpose of filing?

Either to alter the size and shape of a part by removing considerable material or to smooth a surface without removing much material Signup and view all the answers

What is the most commonly used type of file?

Flat file Signup and view all the answers

What is the characteristic of single cut files?

They have teeth formed by a single set of parallel chisel cuts Signup and view all the answers

What should be done if there is doubt about the internal condition of a drill?

Return it to the electrical shop for a complete electrical test Signup and view all the answers

What is a common safety advantage of pneumatic drills?

They are driven by air pressure, making them safer Signup and view all the answers

What is a potential fault in a pneumatic drill?

A split or chafed air-line Signup and view all the answers

What is an important consideration when selecting a drilling machine?

The size of the drill and the dimension of the job to be drilled Signup and view all the answers

What is a characteristic of a bench drilling machine?

It usually has a capacity of 13mm or less Signup and view all the answers

What is a typical feature of the feed mechanism in a bench drilling machine?

Manual with hand feed Signup and view all the answers

Study Notes

Tools and their Functions

A flat chisel is primarily used for shaping and finishing metal, wood, or stone surfaces.
The effectiveness of a flat chisel can be compromised if the cutting angle is too large, resulting in a reduction of cutting efficiency and increased risk of chisel damage.
A side cutting chisel is designed for detailed work, allowing for precision cuts in tight spaces.
The preferred cutting edge for most work in a flat chisel is typically a 25-degree angle to facilitate efficient cutting.
A cutting angle that is too small leads to poor penetration and increased friction, hampering the cutting process.
The typical cutting angle for a flat chisel is generally around 25-30 degrees.

Filing Techniques and Issues

Draw filing is a technique used to refine the surface finish of a material, allowing for smoother results.
Pinning of files refers to the clogging of file grooves with material debris, impairing cutting efficiency.
The effect of pinning on the file is reduced cutting capability and the risk of damaging the workpiece.
Pinning is more prevalent when filing soft metals, as they tend to create more debris and clog file teeth.
To reduce pinning, frequently clean files during use and maintain proper filing techniques.
Failing to clean a file often leads to severely impaired performance and might damage the material being worked on.

Drill Safety and Maintenance

When not in use, a drill should be laid down on its side to prevent accidental activation and damage.
Before using an electric drill, check for damage, ensure the right bit is installed, and confirm power supply connections.
A three-pin plug is essential for electric drills as it provides an earth connection, enhancing user safety and preventing electrical shocks.
If the drill's insulation is damaged, it must be taken out of service immediately and repaired before further use.
Grip and hold the drill firmly with both hands to ensure stability and control during operation.
A safety precaution while chiseling includes wearing protective eyewear to shield against flying debris.

Equipment and Usage Considerations

A rough grinding wheel in chiseling is used for initial shaping and removal of material before finishing.
At the breakthrough point when drilling, apply light pressure to prevent the drill bit from binding or breaking.
Double cut files have intersecting teeth that allow for faster material removal and a coarse finish.
Filing is a process aimed at refining surfaces, achieving precise dimensions, and smoothing edges.
The most commonly used type of file is the single cut file, which provides a fine finish.
Single cut files have parallel teeth that produce a smoother finish compared to double cut files.

Drill Types and Features

If there is uncertainty about a drill's internal condition, it should be disassembled and inspected for wear or damage.
Pneumatic drills offer the safety advantage of reduced risk of electric shock since they operate on compressed air.
A potential fault in a pneumatic drill may include air leaks, affecting performance.
When selecting a drilling machine, consider factors like the intended application, drill specifications, and power source.
A bench drilling machine is designed for stability and precision during drilling tasks.
The feed mechanism in a bench drilling machine typically features adjustable speed and depth for consistent drilling.

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Description

Test your knowledge of cold chisel materials, cutting angles, and the action of cutting different metals. Learn about the characteristics of high carbon steel, tool steel, and alloy steel, and how to choose the right cutting angle for the job.