Revision test 2 2025

disadvantages of machining.

• wasteful of materials

• low labour skills

• time consuming

• dimension accuracy

The following are TRUE about important of machining to be relevant and commercialize

• Variety of work materials

  Variety of part shapes and geometric features

  Dimensional accuracy

• Variety of work materials

  Variety of part shapes and geometric features

  Poor surface finishes

• Variety of work materials

  Dimensional accuracy

  Poor surface finishes

• Variety of part shapes and geometric features

  Dimensional accuracy

  Poor surface finishes

The following statements describes the type of up milling

• Direction of cutter motion is against the feed direction.

  The chip starts out very thin and increases in thickness during the sweep of the cutter

• Cutter rotates in feed direction, chip thinner and tool wear slower.

• 1. Direction of cutter motion same as feed direction, chip shorter and tool life longer.

• Cutter moves along feed direction, chip easily removed and tool life increased.

List operations related to operation in lathe machining

• • Flatturn

  • Sharpface

  • Linespin

  • Boring

• • Deepface

  • Edgeform

  • Tipcut

  • Microroll

  • Facing

• • Boring

  • Chamfering

  • Threading

  • Drilling

  • Knurling

• • Conebore

  • Microfold

  • Sideknurl

  • Chamfering

What are abcdef

• a) Bed

  b) Headstock

  c) Carriage

  d) Tool post

  e) Tailstock

  f) Spindle

• a) Tailstock

  b) Tool post

  c) Bed

  d) Spindle

  e) Headstock

  f) Carriage

• a) Spindle

  b) Carriage

  c) Tailstock

  d) Bed

  e) Tool post

  f) Headstock

• a) Headstock

  b) Spindle

  c) Tool post

  d) Tailstock

  e) Bed

  f) Carriage

What are related with down milling

• direction cutter is same as feed direction

• chip formed is short

• Increase tool life

• direction cutter is opposite with feed direction

• chip formed is long

definition of Electrical Discharge Machining (EDM)

• EDM is a process of joining two metal parts using high electric current, e.g. aluminium and steel.

• of removing material from a work piece using electric discharge. Any materials that conduct electricity can be use e.g. metal, alloys, carbides, graphite

• It removes material by mechanical cutting action between tool and workpiece, e.g. brass and copper.

• EDM uses chemical reaction between electrode and workpiece to remove material, e.g. titanium and carbon steel.

• It is a metal forming process that shapes materials using high pressure and heat, e.g. stainless steel and bronze.

major factors influence the material removal rate in Ultrasonic Machining (USM)

• Amplitude and frequency of the tool oscillation

  Impact forces

  Tool material

  Abrasive and content of the slurry

• Spindle speed

  Coolant temperature

  Amplitude and frequency of the tool oscillation

  Workpiece dimension

  Tool clamping pressure

• Cutting direction

  Feed rate

  Impact forces

  Machine vibration

  Chip thickness

• Cutting depth

  Tool geometry

  Tool material

  Surface roughness

  Coolant flow rate

What are functions of dielectric fluid commonly used in Electrical Discharge Machining (EDM)

• Provide a cooling medium

• Act as an insulator until the potential is sufficiently high

• flushing medium and carry away the debris in the gap

• continuously circulated

• mixture of water and abrasive particles

What are characteristics of abrasive slurry

• A mixture of water and abrasive particles

• contains fine abrasive grains

• to carry debris away

• erode the work piece surface

• maintain the temperature of workpiece