Patent ID: 7182515

Claim:
A mounting structure for a translation apparatus in which a first member moves translationally relative to a second member via rolling elements interposed therebetween, said mounting structure comprising an attachment member to which one of said first member and said second member is to be attached by a threaded fastening member, said attachment member having a screw hole, said screw hole being formed in a fixing surface for fixing of said one member of the translation apparatus and being used for fixing said one member on said fixing surface by being coupled with a threaded fastening member passing through a through hole having an inside diameter φa formed in said one member, wherein a shape of said screw hole is defined as follows: an external edge portion of an opening portion of said screw hole in said fixing surface comprises an annular recess continuous from said screw hole; said screw hole has a nominal diameter b of a female thread of said screw hole; said annular recess has a width c indicated by half of a difference between said nominal diameter and an outside diameter of said annular recess in a radial direction of said screw hole; and said diameter φa, said diameter b, and said width c satisfy the relation 0.5 ×(φa −b) <c≦2.0 ×(φ−b).