Sailrite modifies these motors by adding a smaller 1 3/4-inch motor pulley to slow the top end speed of the machine to 863 stitches per minute (normal speed is 1940 stitches per minute). The smaller pulley also increases low speed power and machine responsiveness.
MC-SCR Power System™ a motor control / silicon controlled rectifier. This solid state controller with 120 volt DC motor (1/3rd HP, 3100 RPM) is compact, powerful and offers much greater slow speed power and control than the Clutch Motor.