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CoroMill 325 Thread whirling cutter for threading of long slender components

The growing use of medical bone screws, implants and other micro-components creates a need for techniques that produce special thread forms quickly and at high tolerances.

CoroMill® 325 thread whirling inserts and holders from Sandvik Coromant meet this need for a large number of sliding head machine types. They can thread long, slender components from rough stock at high speeds and produce a wide range of high precision screws and implants without the need for a dedicated thread whirling machine.

 

Benefits

  • Increased productivity
  • Chip control
  • Increased tool life
  • Cost saving
  • High quality threads
  • One grade for all materials

 

 

Features

  • Compatible with many sliding head machines and spindles
  • Deep threads like ACME are easily made
  • No additional finishing operation is needed
  • Optimized for titanium and stainless steel
  • Blanks available for own unique profiles

 

 

Application

Typical components
  • Bone screws
  • Spinal screws
  • Dental implants
  • Other long, slender components
Typical materials
  • Titanium
  • Stainless steel
Sliding head machine types
  • Citizen
  • Star
  • Tsugami
  • Tornos

 

ISO application area
 
 

 

Recommendations

Step by step instructions
  1. Mount the whirling ring onto the spindle unit
  2. Tilt the spindle unit in relation to the desired helix angle of the screw
  3. Program the ring off-centre, in relation to the diameter
  4. Rotate the whirling ring and component in the same direction (climb milling) for best results regarding tool life
  5. Rotate the whirling ring to actual cutting speed
  6. Rotate the workpiece at a slower speed, determined by its diameter and lead of the thread being made
  7. Coordinate movement of the whirling ring with the rotation of the component for best surface and productivity

 

​ 

Product Range 

Standard threads

Specially-formed inserts for thread whirling are designed to create HA and HB threads forms. These threads have the specific dimensions and tolerances needed for bone screws and other medical implants.

 

HA thread HB thread​

 

Any thread profile can be offered. Please contact your Sandvik Coromant representive.

   

 

  

 
 
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