Dormer’s Solid Carbide Thread Milling Cutters programme is a comprehensive range of high tech tools offering impressive tooling economy and high levels of tool life.
Dormer has introduced 2 new thread milling cutters in Metric thread form, the J110 and the J115 for
applications where countersinking is not required in the hole. For these new thread milling cutters, a 27° spiral angle has been incorporated to give a smoother cutting action. J115 has internal coolant down to the lowest pitch value of 1mm.
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| Advantages of Thread Milling (Compared to conventional threading) |
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- Thread Milling gives increased reliability,namely:
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 | | - Smaller chips |
| - Tolerance adjustments can be made using exact calculations |
| - Full thread to the bottom of the hole |
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- Longer Tool life
- Works in most materials
- Same cutter can be used for many diameters, as long as the pitch is the same
- Same tool can be used both for left and right internal threads, and some even for external threads.
- Enables dry machining
- Countersink on metric cutter makes it possile to chamfer.
- Ability to generate two start threads
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| Other Facts about Thread Milling |
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- Thread milling is a slow process and time savings will appear first on larger dimensions, but the quality of finish and the accuracy acheived greatly outweigh the speed of the production process
- Thread depth is limited to 2 x diameter for metric and 1,5 x diameter for metric fine and G (BSPF)
- It is possible to regrind the cutter on the rake side
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| Material |
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 | All carbide Thread Milling Cutters from Dormer are manufactured from K10/30F Carbide and have a TiAlN-X surface coating. Tests have shown that the TiAlN-X coating enhances the cutters' durability and performance compared to uncoated cutters.
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| Hints and Tips on Thread Milling |
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- Always refer to the AMG chart for correct cutting speed
- Also refer to the feed chart to ascertain the correct feed
- Use standard tapping drill sizes
- For easy adjustment of thread-tolerance always programme with radius correction. Start value (Rprg) is marked on the cutter.
- If possible, always use climb milling. If the surface of the material is hard, conventional milling may be considered.
- Select the cutter according to pitch form, not diameter
- To increase stability, choose the largest diameter tool possible for your application.
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