Acetabular cup

Since cobalt chrome is an abrasive material, the challenges when machining the internal sphere include getting a high surface finish, reducing vibration using longer tools and getting inserts to run a full batch.

v_c can be altered, but pushing feed (f_n /f_z) above 0.15 mm (0.006 inch) is very destructive to tool life.

Benefits

• Highly effective process with circular ramping
  
• Longer tool life and less tool breakage
  
• Secure process
  
• ime
  
• High quality surfaces with positive round in

• serts

Machining solution

1. Drilling with CoroDrill® 846
   
2. Circular interpolation milling with CoroMill® 216 (for more information, see below)
   
3. Semi finish turning with positive round insert
   
4. Finish turning with positive round insert (for more information, see below)
   
5. Parting off
   
6. Polishing
   

Machining solution – circular interpolation milling

Circular interpolation generates a constant spiral to generate a rough form for the semi finishing tool. Use a 1.5 mm (0.060 inch) spiral tool path pitch.

Machining solution - finish turning

Selected component features

• Internal sphere
• External sphere