On many modern CNC machining centres the rotation of the spindle can be synchronized with the feed axis. This allows to produce threads with tool holders without length compensation.
However, practical experience shows that even with this kind of "rigid tapping", synchronization errors can occur.
Possible causes are:
- clearance in the tooth flanks in the driven tool holder
- clearance in the drive between driven tool holder and machine drive
- tolerances on the threading tool
- machine dynamics, harmonization of spindle and linear drives, especially during the moment of changing the rotation direction.
When rigid tool holders are used, these errors can lead to problems. High axial forces come into play, and can have serious negative consequences on the production process, such as:
- reduced tool life, caused by high one-sided flank friction on the threading tool
- unclean thread flanks on the workpiece
- threads not true-to-gauge
EMUGE collet holders type KSN/Softsynchro®: serve as absorbing link between synchronous spindle and tap/cold-forming tap, and compensate pitch differences between threading tool and synchronous spindle, resp. drive
- provide the high concentricity of a rigid tool holder
- guarantee safe clamping of taps / cold-forming taps by collets with square drive
- do not require tools with special shanks
- guarantee process safety in the synchronous production of threads