| 摘要 |
<p>Methods and machining apparatus for indexing and forming spool and pinion shafts (12 and 20) for use in a rotary control valve (10) of a power steering system are disclosed. In particular, the methods include forming a contoured spool shaft extension (58) on an end of a spool shaft (12) and a complementary rosette on an end of a pinion shaft (20), and forming spool and pinion shaft holders (66 and 80) having complementary rosettes and contoured ends, respectively, to permit accurate mounting of the spool and pinion shafts (12 and 20) during subsequent machine operations. The machining apparatus includes a workpiece holder (156) which rotates the spool or pinion shaft (12 or 20) at a predetermined speed and a cutting assembly (106) which moves a cutting tool (86) into and out of contact with the workpiece (132) at three times the speed of rotation of the workpiece (132).</p> |
