CASA Part 66: Maintenance Practices for Grinding Machines

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What is the correct way to hold flat or sheet work on a grinding machine?

Holding it directly on the wheel
Holding it with the back part lowered
Holding it at an angle to the wheel
Holding it in a way that prevents hammering or vibration (correct)

What should you do to maintain even wear on the abrasive wheel?

Apply side pressure on the wheel
Grind only on the corners of the wheel
Rotate the wheel periodically
Move the work across the face of the wheel (correct)

What is the risk of using the side of an abrasive wheel not designed for side grinding?

The wheel may break or the work may become jammed (correct)
The wheel may become jammed with the work
The work may become overheated
The grinding process may slow down

Why should you avoid quenching high-speed steel work directly in cold water?

It may cause cracking of the edge (A) Signup and view all the answers

What is the primary reason for the loss of cutting efficiency of a grinding wheel?

The abrasive particles become blunt from cutting the hard material (B) Signup and view all the answers

What is the purpose of having a container of cool, clean water nearby when grinding small work?

To cool the work as it becomes heated (C) Signup and view all the answers

How can glazing of the grinding wheel be prevented?

By selecting a wheel with a softer grade of bond (B) Signup and view all the answers

What is the recommended way to cool small work made from high-speed steel after grinding?

Allowing it to cool in air (B) Signup and view all the answers

What is the main cause of grooving on the surface of the grinding wheel?

Applying too much pressure in one position (B) Signup and view all the answers

Why should you avoid grinding on the outside edges of the wheel?

It results in rapid wear and causes a curved surface on the wheel (C) Signup and view all the answers

What is the primary reason for selecting the correct type of wheel for the material being ground?

To prevent loading and glazing conditions (B) Signup and view all the answers

Why should you not use a small bench grinder for heavy, rough grinding?

It is not designed for heavy, rough grinding and may damage the grinder (D) Signup and view all the answers

What is a key reason to keep the drill cutting and not allowing it to just rub?

To prevent the drill from becoming blunt (A) Signup and view all the answers

What type of lubricant is suitable for drilling copper and brass?

Kerosene (C) Signup and view all the answers

What is the correct order of steps when drilling a part?

Select the correct size drill, check the speed, hold work securely, feed the drill slowly (A) Signup and view all the answers

Why should you wear eye protection when drilling?

To protect your eyes from potential debris (D) Signup and view all the answers

What should you do before drilling a hole with a diameter greater than 10 mm?

Drill a pilot hole (B) Signup and view all the answers

What should you inspect before using a drill?

Electrical cords and air hoses, and the tools themselves for damage (A) Signup and view all the answers

What is the recommended air pressure at the tool according to most manufacturers?

90 psi (A) Signup and view all the answers

Why should you avoid directing compressed air at another person?

It can cause serious injury or death (D) Signup and view all the answers

What should you do to protect the air hose from damage?

Move it out of the way of vehicles and avoid dragging around sharp corners (B) Signup and view all the answers

Why should you check the exhaust air ducts on the tool?

To ensure they are clean and not damaged (A) Signup and view all the answers

What should you do before connecting or disconnecting any pneumatic tools?

Turn off the air supply (C) Signup and view all the answers

Why should you not use compressed air to clean your clothes or hair?

It can cause eye damage or ruptured ear drums (D) Signup and view all the answers

What is the recommended direction of rotation for the spindle on the right?

Clockwise (B) Signup and view all the answers

What is the result of using the wrong type of wheel for the material being ground?

Loading of the grinding wheel (B) Signup and view all the answers

What is the purpose of referring to the manufacturer's handbook for the grinding wheel?

To review the specification of the wheel (B) Signup and view all the answers

What is the characteristic of a grinding wheel suitable for grinding soft, ductile materials?

Wide spacing of the grains (A) Signup and view all the answers

What is the result of grinding hard materials on a wheel with too hard a grade of bond?

Glazing of the grinding wheel (D) Signup and view all the answers

What is the purpose of off-hand grinding?

To grind specific shapes or profiles (B) Signup and view all the answers