Machine-Specs

Spindle power and torque are related but different specifications. Power determines how fast material can be removed. Torque determines how much cutting force the spindle can deliver at low RPM. For deep hole drilling, misunderstanding these two specs leads to undersized spindles that stall in the cut. I have seen a 35 kW spindle stall out on a 60 mm BTA drill because the machine peaked at high RPM and delivered only 80 Nm at the feed rate needed for BTA parameters. ...

Machine spec sheets for deep hole drilling machines are written by marketing departments. Some numbers are meaningful indicators of real performance. Others are chosen to make the machine look better than it is on paper. I have evaluated a dozen deep hole drilling machine brands over twenty years, and I have learned which specs predict actual drilling performance and which ones are just numbers on a page. Here is how I separate the two when I read a spec sheet for a deep hole drilling machine. ...