Blade positioning structure of disposable milling cutter

A blade positioning structure of a disposable milling cutter, the disposable milling cutter comprising:

• a cutter body, the cutter body having a pair of opposing planar sides and an outer periphery provided with a blade seat, the blade seat extending transversely through the cutter body and having a threaded hole, the threaded hole being inclined at a first angle relative to the pair of opposing planar sides;
• and
• a disposable blade, the disposable blade being positioned in the blade seat and penetrated by a screw hole, the screw hole being inclined at a second angle equal to the first angle of the threaded hole to align therewith, and the disposable blade being locked to the blade seat by passing a screw through the screw hole and the threaded hole, the screw being inclined relative to the pair of opposing planar sides of the cutter body thereby;
• wherein the blade seat has a blade seat surface and a sidewall, the blade seat surface being provided with at least one groove;
• wherein the disposable blade has a bottom surface provided with at least one bottom projection and a top surface provided with at least one top projection, each of the bottom projection and the top projection corresponding in shape to the groove in the blade seat surface, said groove in the blade seat surface matingly engageable with either the disposable blade bottom projection or the disposable blade top projection interchangeably;
• and
• wherein the blade seat surface and the groove of the blade seat lie respectively and tightly against a respective one of the top surface or the bottom surface and the corresponding top or bottom projection of the disposable blade when the disposable blade is locked to the blade seat.