Super Joint System
How It Works
With the rotation of the armature the coil spring is extended, its tightening force increases the grasp of the coil on the armature spindle and shaft. At this point the gear and spindle start to rotate simultaneously.
Against the shock of accidental spindle lock or overload, which surpasses the limited torque designed for the tool, the coil spring will override the armature shaft preventing damage to the armature and internal components.
The Makita Super Joint System is in place for the wellbeing of both the user and their tools. The Super Joint System will instantly disengage a tools motor at the sign of any sudden, overbearing force or pressure that may be caused by a snag on the blade.
This means that of all the unexpected things that could occur while you're on the work site, your machine running off from you and causing harm won't be one of them.
Of course, the other benefit of the Super Joint System is the longevity it affords your equipment. By removing the strain that can be put on a motor at times, by disengaging it's unlikely for any parts to grind or overload and so prevent any needed repairs or even replacements.