Deep Hole Drilling on Automatic Lathe

It was not an easy task for a well known Italian manufacturer, supplier for the medical industry. A hole with a diameter 5.1mm and a length of 178mm had to be drilled into a work piece made from Titanium Ti-6Al-4V. The basic requirement was process reliability and economic viability which pays.

The demand on quality was also high, because the maximum deviation on the hole length had to be within 0.4mm. The workpiece was machined on an automatic lathe (swiss type screw machine), Star SR20. Cutting oil with viscosity ISO VG 10 was used as coolant. In order to guarantee an absolute straight hole a pilot bore with CrazyDrill Pilot was performed first.

Subsequently a first hole to a depth of 50mm was done with a CrazyDrill Cool with through tool coolant. The final depth was achieved with an additional CrazyDrill of 37x Ø with through coolant. The feed of 0.08mm/rpm and cutting speed of 25 m/min had to be adapted to the machine used and to the material to be machined. The entire machining process with Crazy Drill was achieved in only 3.5 minutes and was much faster than before. Another plus was the resulting tool life, which with the CrazyDrill was much longer.

The customer concluded: “For challenging machining tasks you are better off with a renowned manufacturer with the necessary know-how; somebody like Mikron Tool.”

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