Threading
CoroMill 325 - High precision threading performance
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.
New 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.
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 | Designed for medical machining
All Sandvik Coromant thread whirling inserts are available in GC1105 – the first-choice grade for medical machining. GC1105 offers sharper edges and a burr-free component surface:
- Dedicated to machining stainless steels and titanium
- Ideal for stable applications for all materials in sliding head machines
- Enables longer, more continuous runs, with higher productivity
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| HA thread form | HB thread form |
Stocked standard programme
for HA and HB thread forms
Specially-formed inserts for thread whirling are designed to create HA and HB thread forms. These threads have the specific dimensions and tolerances needed for bone screws and other medical implants. |
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Stocked whirling rings for different machine types
| Whirling ring codes | MTM | Spindle producer |
| 325-12AP40-16M | Citizen | PCM |
| 325-12AQ40-16M | Citizen | Jarvis |
| 325-12BB40-16M | Star | Star |
| 325-12CC52-16M | Tsugami | Tsugami |
| 325-12DD40-16M | Tornos | Tornos |
| 325-12EE32-16M | - | WTO |
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Choose your own thread!
Order special inserts for any thread profile; and rings for other spindle units.
See your Sandvik Coromant representative for more information and to make your request for non-standard rings and inserts. |
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Performance test
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| Material: | Titanium Ti-6AI-4V ELI | |
| Thread dia, mm (inch): | 3.5 (0.139) | |
| Length, mm (inch): | 25 (0.984) | |
| Thread profile: | HA4 | |
| Pitch, mm (inch): | 1 (0.04) | |
| Machine tool: | Tsugami 14 | |
| Components/year: | 500 000 | |
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| Cutting data | Competitor | Sandvik Coromant |
| hex, mm (inch) | 0.04 (0.002) | 0.04 (0.002) |
| vc, m/min (ft/min) | 26 (85) | 26 (85) |
| No. of passes | 1 | 1 |
| Cycle time, min | 0.6 | 0.6 |
| No. of components | 215 | 1100 |
Result: 511% increase in components produced | |
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