Orthogonal rake system is also known as-

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NPCIL SA/ST ME GJ held on 07/11/2019 Shift-1
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  1. ISO system
  2. Old ISO system
  3. Normal rake system
  4. All of the options

Answer (Detailed Solution Below)

Option 2 : Old ISO system
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Detailed Solution

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Explanation:

A tool has two systems:

  1. American Standards System 
  2. Orthogonal Rake System 

ASA tool signature has 7 elements

  • American Standards System (ASA) system ⇒ Back rake angle – side rake angle – end relief angle (ERA) – side relief angle – end cutting Edge angle – side Cutting Edge Angle- Nose Radius
  • Orthogonal Rake System (ORS) or International system ⇒ I (inclination angle) – αn (Normal rake angle)  - Side relief angle- end relief angle, end cutting edge angle – Approved angle – nose radius. It is also known as Old ISO system.
  • In both, the system nose radius comes in the last.
  • In given system 8 - 8 - 5 - 5 - 6 - 6 - 1, the following notations are indicated 
    • 8 shows Back rake angle
    • 8 shows Side rake angle
    • 5 End relief angle
    • 5 Side relief angle
    • 6 End cutting edge angle
    • 6 Side cutting edge angle
    • 1 nose radius
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