Patent ID: 6590178
Filing Date: 2003-07-08
Classification: B23H

Abstract:
A combination drilling and mechanical tapping electro-discharge machining (EDM) drill capable of selectively operating in hole drilling mode or thread tapping mode, comprising:a rotation axis as a R axis driven by a servo motor; a machining axis as a Z axis driven by another servo motor; a sleeving member put on a slide sleeve of said Z axis from a top, said sleeving member having a shank inserted in a bore of said slide sleeve, two opposite apertures, two pins inserted through said apertures to fasten on said slide sleeve; a spring is put on a lower part of each pin being biased between a bottom of a top part of said sleeving member and a top of said slide sleeve; and a locking member on a side of said slide sleeve for locking said shank of said sleeving member in said bore of said slide sleeve; wherein said shank of said sleeving member is unlocked when said locking member is unfastened for partially fastening said Z axis while said sleeving member and said slide sleeve are coupled together by said pins and said spring, thereby causing said slide sleeve of said Z axis to be in synchronous with an advancing of said R axis.