ISO/VDI reductions

These reductions enable transition from an ISO steep cone to a non-rotary tools holder of VDI standard. With these reductions, tool setters may be used for setting non-rotary tools of lathes equipped with VDI tool holders.

Reductions are manufactured in compliance with valid ISO standards.

A VDI test bar is recommended to be purchased for every reduction. The bar is fitted with an edge with evaluation parameters of X and Z coordinates.

These specifications determine the beginning of reduction coordinates.

The coordinates are checked by a calibration laboratory.

Calibrated test bar has two functions.

First, it ensures very accurate setting of the coordinate beginning, based on real dimensions situated to the tool setting area.

Second, it represents a test bar – primary standard, ensuring connection to national standards when assuring ISO standard functions.

If a reduction is used, the effective length of Z coordinate is shortened. With ISO/VDI reductions the shortening varies, see the following table: