ATTACHMENTS & WORK HOLDING DEVICES

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• Q1: Define Attachments. Name some.
  Ans: Attachments are additional devices used with a milling machine to increase its functions and capability.
  Some attachments are:

  • ➔ Dividing Head
  • ➔ Vertical Head
  • ➔ Slotting Head
  • ➔ Rotary Table
• Q2: What is a Dividing Head?
  Ans: A dividing head is a device used to divide a workpiece into equal parts. It is commonly used for cutting gears and equally spaced slots.
• Q3: State some standard accessories of Dividing Head.
  Ans: The standard accessories are as follows:

  • ➔ Index plates
  • ➔ Tailstock
  • ➔ Chuck
  • ➔ Centers
• Q4: Write four uses of Dividing Head.
  Ans: The uses of dividing head are as follows:

  • ➔ Gear cutting
  • ➔ Cutting splines
  • ➔ Drilling equally spaced holes
  • ➔ Milling hexagonal or square shapes
• Q5: What is Direct Indexing?
  Ans: Direct indexing is a method in which the workpiece is rotated directly by a fixed plate having holes to divide it into equal parts quickly.
• Q6: What is Plain or Simple Indexing?
  Ans: Plain or simple indexing is a method in which the workpiece is rotated by using a crank and index plate to divide it into equal parts accurately.
• Q7: What is Differential Indexing?
  Ans: Differential indexing is a method used when simple indexing is not possible. It uses gear mechanisms along with index plates to obtain accurate divisions.
• Q8: What is Angular Indexing?
  Ans: Angular indexing is a method used to rotate the workpiece by a specific angle instead of equal divisions.
• Q9: What is Spiral or Helical Milling?
  Ans: Spiral or helical milling is a process used to produce helical shapes like gears and threads by rotating the workpiece and moving the table simultaneously.
• Q10: What is a Vertical Head?
  Ans: A vertical head is an attachment that converts a horizontal milling machine into a vertical milling machine by changing the spindle position.
• Q11: State the use of Vertical Head.
  Ans: The uses of vertical head are:

  • ➔ Performing vertical milling operations
  • ➔ Drilling and boring
  • ➔ Machining complex shapes
• Q12: What is a Slotting Head?
  Ans: A slotting head is an attachment used to convert rotary motion into reciprocating motion for cutting slots and keyways.
• Q13: State the use of Slotting Head.
  Ans: The uses of slotting head are:

  • ➔ Cutting keyways
  • ➔ Cutting internal slots
  • ➔ Machining grooves
• Q14: What is a Rotary Table?
  Ans: A rotary table is a device used to rotate the workpiece at precise angles during machining operations.
• Q15: State any four uses of Rotary Table.
  Ans: The uses of rotary table are:

  • ➔ Circular cutting operations
  • ➔ Drilling holes at equal angles
  • ➔ Milling arcs and curves
  • ➔ Gear cutting
• Q16: Briefly discuss the construction of Rotary Table
  Ans: A rotary table consists of a circular table mounted on a base.
  It has a worm and gear mechanism for rotation.
  It also includes a hand wheel for precise movement.
• Q17: What are Vices and Hold Downs in a Milling Machine?
  Ans: Vices and hold downs are devices used to hold the workpiece firmly on the machine table during machining operations.
• Q18: What is Machine Vice in a Milling Machine?
  Ans: A machine vice is a clamping device used to hold the workpiece securely on the milling machine table.
• Q19: What is Swivel Base Vice in a Milling Machine?
  Ans: A swivel base vice is a type of vice that can rotate at different angles, allowing angular machining of the workpiece.
• Q20: What is Universal Vice in a Milling Machine?
  Ans: A universal vice is a special type of vice that can be adjusted in multiple directions, allowing machining at various angles.
• Q21: What is Compound Angle Setting?
  Ans: Compound angle setting is a method used in machining where the workpiece or tool is set at two different angles at the same time.
  It helps to produce complex shapes like tapers or angular surfaces accurately.
• Q22: What is De-burring?
  Ans: De-burring is the process of removing small rough edges or unwanted material (called burrs) from a workpiece after machining.
  It improves the surface finish and makes the part safe to handle.
• Q23: What are Milling Arbors?
  Ans: Milling arbors are special tools used to hold and support milling cutters on a milling machine.
  They are mounted on the spindle and help in accurate and stable cutting.
• Q24: Write the use of Shell End Mills Arbors?
  Ans: Shell end mill arbors are used to hold shell end milling cutters.
  They help in performing heavy cutting operations and ensure proper alignment of the cutter during machining.
• Q25: Briefly discuss the change gears provided along the dividing head.
  Ans: Change gears in a dividing head are used to connect the spindle with the index plate.
  They help in performing differential indexing when simple indexing is not possible.
  By changing the gear ratio, different divisions can be obtained easily.
• Q26: Define Indexing.
  Ans: Indexing is the process of dividing a workpiece into equal parts using a dividing head.
  It is commonly used in milling operations like cutting gears, splines, and slots.
• Q27: Name four types of Indexing.
  Ans: The types of indexing are as follows:

  • ➔ Plain Indexing
  • ➔ Compound Indexing
  • ➔ Differential Indexing
  • ➔ Angular Indexing
• Q28: What are Index Circles?
  Ans: Index circles are a series of holes arranged in circles on an index plate.
  These holes are used to rotate the workpiece by a specific amount during indexing operations.
• Q29: Name the Index circles for Plate #1 of Brown and Sharp Company.
  Ans: The index circles for Plate #1 are:

  • ➔ 15 holes
  • ➔ 16 holes
  • ➔ 17 holes
  • ➔ 18 holes
  • ➔ 19 holes
  • ➔ 20 holes
• Q30: Name the Index circles for Plate #2 of Brown and Sharp Company.
  Ans: The index circles for Plate #2 are:

  • ➔ 21 holes
  • ➔ 23 holes
  • ➔ 27 holes
  • ➔ 29 holes
  • ➔ 31 holes
  • ➔ 33 holes
• Q31: Name the Index circles for Plate #3 of Brown and Sharp Company.
  Ans: The index circles for Plate #3 are:

  • ➔ 37 holes
  • ➔ 39 holes
  • ➔ 41 holes
  • ➔ 43 holes
  • ➔ 47 holes
  • ➔ 49 holes