Patent ID: 8274008

Claim:
An electrical discharge machining spindle assembly comprising: a pull stud, an electrode holder, a fluid seal, and a seal holder, wherein; the electrode holder comprises a tail end, a nose end, and an electrode accommodating passage extending from the tail end to the nose end of the electrode holder; the electrode holder further comprises a counter bore comprising a threaded inside diameter in the tail end of the electrode holder aligned with the electrode accommodating passage of the electrode holder; the seal holder comprises a threaded outside diameter, a tail end, a nose end, and an electrode accommodating passage extending from the tail end to the nose end of the seal holder; the seal holder further comprises a seal accommodating space in the tail end of the seal holder aligned with the electrode accommodating passage of the seal holder; the threaded outside diameter of the seal holder is threadedly engaged with the threaded inside diameter of the counter bore; the pull stud comprises a threaded outside diameter, a tail end, a nose end, and an electrode accommodating passage extending from the tail end to the nose end of the pull stud; the threaded outside diameter of the pull stud is threadedly engaged with the threaded inside diameter of the counter bore; and the threaded inside diameter of the counter bore in the electrode holder comprises a longitudinal threading dimension that is sufficient to accommodate the entire longitudinal threaded outside diameter of the seal holder and a portion of the longitudinal threaded outside diameter of the pull stud sufficient to create threaded engagement, with the fluid seal positioned in the seal accommodating space.