One of the most basic gates for injection molding is the edge gate.
The gate normally has a rectangular cross-section along the parting line of the mold to connect the runner system with the mold cavity.
The lapped edge gate is slided onto the top of the cavity.
It can be easily manufactured by a basic machining process.
The risk of jetting is reduced with this version.
The disadvantage of the edge gate is the remaining of the connection of the molded part to the runner after ejection. Additional mechanical action is needed for separation.