Orthogonal rake system is also known as-

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