and crank bearing 56 fit within another circular fitting at a second and opposite end of the connecting rod 84 as the motor 70 turns the eccentric cam 82 the first end of the connecting rod 84 is correspondingly moved this movement is translated to the second end of the connecting rod 84 and enables the crank 54 to move the blade 20 in a back and forth saw like oscillating motion as shown by arrow 21 in fig2 b it is this oscillating motion of the blade 20 which enables cutting of casts or other rigid objects the length of the connecting rod 84 provides the present device 10 with an efficient angle to drive the cutting blade 20 as shown in fig2 a and 2c it is actually the crank end 52 which is coupled to the cutting blade 20 the bearings 56 57 86 and 87 all provide support and provide a low friction close fit between the various members this low friction close fit at all points in the drive mechanism enables quieter and cooler operation of the cutting device 10 when compared to the prior yoke arrangement devices fig2 c also shows details of the switching system of the cutting device 10 as shown in fig2 c the buttons 30 32 and 34 are all mechanically coupled to the switch 42 and the turbo button 36 is mechanically coupled to the turbo switch 90.