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Tool Clamping Types 

There are two basic styles of spindles; manual tool change and automatic tool change. The type used depends on the application and size of cutting tools for the application.

Manual Tool Change

Electric Spindles with manual tool change clamp the tool/cutter using a spring collet in the taper of the spindle shaft. This method offers excellent rigidity at a low cost. The disadvantage is tool setup is done on-line, with the machine out of cycle usually around 2-3 minutes each change. 






Automatic Tool Change

Electric Spindles equipped with automatic tool change (ATC) can be integrated with a CNC for quick tool changes without manual intervention. Typical tool change times are less than 5 seconds. On applications requiring multiple cutters, an ATC spindle offers higher productivity. With an ATC spindle tools/cutters are pre-set in tool holders. Tool holders are typically clamped in the electric spindle by a spring loaded clamping system. Tool holders are released by compressing retention springs and opening the clamping system (typically with a pneumatic actuator). Pre-Setting tools occurs off-line using jigs for accuracy and without interrupting production.

ISO and HSK are the two most common tool holders used on CNC routers, robots and milling machines. ISO 30 is more popular than the smaller taper sizes ISO 25, 20 and 15. HSK 40, HSK 50 and HSK 63 tool holders provide better cutting accuracy and reliability. Their popularity is growing rapidly due to performance.

                  ISO                               HSK