Tungaloy’s -01 Geometry for Precision Finish Turning on Swiss Lathes


Facebook Share Icon LinkedIn Share Icon Twitter Share Icon Share by EMail icon Print Icon

Tungaloy enhances its ISO positive turning inserts in “-01” geometry to include a 0.4-mm (0.0157") nose radius prepared in a minus tolerance, specifically for precision finishing in Swiss turning applications. 

The -01 geometry is designed to deliver consistent chip control at light cutting depths of 0.5-mm (0.020") or smaller. The introduction of a 0.4-mm nose radius insert is implemented because of the increased demands in the Swiss turning market where workpieces with 0.4-mm corner radius requirements are as popular as workpieces with 0.2-mm radii. In addition, these corner radii are often required to be finished equal to or smaller than the required radius dimensions in order to minimize the impact on dimensional accuracy. Therefore, the insert nose radii of the -01 geometry are all designed and constructed in a minus tolerance to the nominal nose radii and not exceeding it.

Combined with the existing -JS geometry, the first-choice for small part turning, the enhanced lineup of the -01 geometry provides customers with optimal chipbreaker options for various cutting depths and feed rates in Swiss turning operations, the company says.

The -01 geometry is optimized for cutting depths of 0.5 mm (0.020") or less, while -JS geometries are effective for depths of cut ranging from 0.5 mm to 3.0 mm (0.020" to 0.118").


  • Thread Whirling Basics

    The rapidly increasing demand for high-value threaded parts with exceptionally high length-to-diameter ratios has created a lot of interest in thread whirling technology among American shops and manufacturers.

  • Making Micro Threads

    Production of micro threads can be challenging, but using the most suitable tools for a given application can simplify the task.

  • Skiving Long, Slender Parts with Tight Tolerances

    Here's a look at one of the oldest and most efficient methods of screw machine production for parts that are long and slender, with close-diameter tolerances and finishes, or parts that require truly spherical radii.