Welcome to Scandinavian Tool Systems’ Knowledge Base. Here you’ll find concise guides, articles, and tips from our application specialists. Our goal is to give you quick answers and clear recommendations that improve tool selection, processes, and results. Updated continuously—start exploring.
  • Internal Thread Turning: A Technical, Practical Guide for CNC Lathes 
    by Scandinavian Tool Systems
    Internal thread turning is the process of generating a helical thread form inside a bore by synchronizing the Z axis feed with spindle rotation. Compared with tapping, internal thread turning offers superior flexibility across thread standards, variable pitches, and difficult materials. It is often the preferred method for large diameters, interrupted bores, short thread runouts, or when torque and chip packing make taps unreliable.  This article focuses on the technical fundamentals that determine success: geometry, kinematics, rigidity, chip formation, programming strategy, and inspection.  1) The kinematics: what the machine must do correctly  Internal thread turning on a CNC lathe requires:  Practical implication: internal threading is often limited more by machine dynamics and setup rigidity than by nominal insert grade.  2) Thread geometry: the variables that drive cutting behavior …
  • External Thread Turning Guide 
    by Scandinavian Tool Systems
    External thread turning is the process of generating a screw thread on an outside diameter by synchronizing the tool’s axial feed with spindle rotation. It is a highly flexible method because you can produce many thread forms, pitches, and tolerance classes on the same machine, but it demands good process discipline: rigid setup, correct infeed strategy, and controlled chip formation.  Define the thread specification before cutting  Confirm the full definition, not only “M20x2.5” or “1/2-13”:  This prevents the most common error: producing a thread that “looks correct” but fails functional gauging due to pitch diameter, profile, or runout.  Part preparation and setup …
  • Guide to External Thread Milling
    by Scandinavian Tool Systems
    How we help you machine reliable threads with our ThreadMill solutions External thread milling is one of the most flexible ways to produce threads on shafts, tubes and other external…
  • A Guide to Grooving 
    by Scandinavian Tool Systems
    Understanding the Role of Grooving in Modern Turning  In precision turning, grooving is one of the most critical and complex operations. It involves cutting a narrow channel “a groove” into…
  • Thread Tapping vs Thread Milling 
    by Scandinavian Tool Systems
    Both thread tapping and thread milling can produce high-quality internal (and, for milling, external) threads. Tapping wins on cycle time and simplicity for standard through-holes in forgiving materials. Thread milling…