Precision Machining and Benchwork

What is the purpose of a micrometer?

• To play music

• To cook food

• To measure time

• To measure small distances or thicknesses with precision.

Explain the safety procedures to be followed while using a bench grinder.

• Adjust the tool rest while the grinder is running, wear gloves with holes, and use the grinder on a wet surface

• Wear safety goggles and gloves, adjust the tool rest, and securely hold the workpiece.

• Wear sandals and shorts, keep the tool rest far away, and use the grinder with wet hands

• Use the grinder without safety goggles, hold the workpiece with one hand, and stand directly in front of the wheel

Why is it important to consider material properties when selecting a material for machining?

• To make the material heavier

• To increase the cost of machining

• To make the material harder to machine

• To ensure the material can be effectively and efficiently machined without causing excessive tool wear or damage.

Name three common measuring tools used in precision machining.

• Screwdriver, Hammer, Saw

• Micrometers, Calipers, Dial Indicators

• Wrench, Drill, Chisel

• Ruler, Pencil, Eraser

What are the safety precautions to be taken when working with power tools in a machining workshop?

• Leaving tools and materials scattered on the floor

• Using tools with damaged cords or plugs

• Wearing sandals and shorts while working

• Wearing appropriate personal protective equipment (PPE), ensuring tools are in good condition, using tools according to manufacturer's instructions, and keeping work area clean and organized.

How does the hardness of a material affect its machinability?

• Harder materials are more difficult to machine.

• Softer materials are more difficult to machine.

• The hardness of a material has no effect on its machinability.

• Harder materials are easier to machine.

What is the function of a dial indicator in precision machining?

• To play music

• To measure large distances

• To cook food

• To measure small distances or angles with high precision

Describe the proper technique for using a vernier caliper to measure the dimensions of a workpiece.

• Hold the caliper at an angle and guess the measurement

• Gently close the jaws around the workpiece and read the measurement from the scale and vernier scale.

• Slam the jaws shut around the workpiece and estimate the measurement

• Use the caliper to scratch the workpiece and then measure the scratch

Why is it important to wear safety goggles when working with metal during benchwork?

• To improve vision in dim lighting

• To keep the hair out of the face

• To look cool and professional

• To protect the eyes from metal particles or debris.

What factors should be considered when selecting a cutting tool for a specific machining operation?

• Material being machined, cutting speed, feed rate, depth of cut, and tool material

• Size of the cutting tool

• Color of the cutting tool

• Brand of the cutting tool