SJS Technology SJS ™ grinders include an innovative mechanical system that allows the drive shaft to slip if the wheel suddenly catches or binds. SJS ™ is engineered to help protect the gears and motor, and extend grinder life.
SJS is an advanced drive system, based on a coil spring which wraps around the internal drive spindle.
On start-up, the coil tightens around the spindle to produce smooth, direct and highly efficient drive from the motor to the grinder disc.
If the grinder ‘grabs’ or overloads the motor, the SJS is instantly disengaged by the reversed force and the drive spindle rotates freely.
Armature Drive Shaft
Spiral Bevel Gear Coil Spring
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