Unique dust suction port structure design, excellent dust suction effect with vacuum cleaners, greening and environmental protection, L-slots are opened first, and then side-slots are opened to reduce the wear of the saw blade, effectively prolong the life of the motor, and the feeding speed can be adjusted. Spindle motor Adjustable speed, can open side grooves, straight grooves, letter handles, double grooves, can also open non-through grooves, can be pre-milled with 45° inclined plane, beveled, straight edge, and pre-milled.