Milling threads without a tapping drill bore

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32 threads and no abrasive wear

The outcome was a solution that immediately convinced everyone involved. “We milled all 32 threads on the mould insert with the EDT-1.0-15-TH directly into hard material in a single fixture setting, albeit with several presentations to the tool,” reports Heiko Meyer, who went on to say that the cutting result from the thread miller still looked like new after the last thread had been cut, without any signs of abrasive wear. “That really did impress us”. The applications technician was also satisfied that everything simply ran as smoothly as he still remembers today. “In terms of compressed air cooling, and therefore with swarf removal on the 5-axis Speed Hawk 650, we regrettably did not have ideal conditions.” The key to successful thread milling is reliable swarf removal, without which tool failure is likely to occur. Nonetheless, everything ran as smoothly as planned right from the very first thread.

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“Until I saw it with my own eyes, I would not have believed that you could mill straight into hardened materials in a process-reliable manner without pre-drilling,” admits Heiko Meyer openly. “Certainly not with materials of 60 HRC and more.” Precisely this was demonstrated in Hermsdorf a short while ago at a customer workshop. This involved using EDT tools to mill several M6 and M8 threads into 1.2379 (X155CrVMo12-1) cold working steel with a high alloy content. “What we demonstrated here was that thread milling, even at 60 HRC, functions in an absolutely process-reliable manner, and that even gauge-compliant threads can be manufactured in a reproducible manner.” This is of particular interest to a production service provider such as Eropräzisa because, to a growing extent, this is what customers are calling for.

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100 percent faster

The Hermsdorf-based precision specialist also impressed with the enormous saving in time it was able to achieve. Milling of all 32 of the M6 threads on the form insert was completed within about half an hour, so roughly one minute per hole. “The die-erosion of a single thread could otherwise have taken an hour, after which we would have had to change the fixture setting to reflect the physical arrangement of the threads,” explains Heiko Meyer. “With thread-milling, we were therefore 100 percent faster.” To which Thomas Richter had this to add: “We are deeply impressed by MMC Hitachi Tool. Their tools are really good, and in some cases are even indispensable to us.” The Eropräzisa boss also praised their application-specific advice and their on-site support. “After all, it is on this that any machining outcome stands or falls.”

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