Disclosed is an improved method of manufacturing cooled accelerator grid with full penetration weld configuration. In a preferred form, the method includes the steps of: machining a plurality of stubs, a first and a second end of a plurality of inconel pipes; welding the stubs with the first end of the inconel pipes forming a water connector assembly; machining of a base plate; welding the base plate with the water connector assembly; machining the base plate welded with the water connector assembly, wherein machining further comprises milling of plurality of cooling channels across angled plane of the base plate welded with the water connector assembly; closing of plurality of cooling channels located on the base plate welded with the water connector assembly; and welding each of plurality of external hydraulic circuits with the second end of each of the plurality of inconel pipes.

Disclosed is an improved method of manufacturing cooled accelerator grid with full penetration weld configuration. In a preferred form, the method includes the steps of: machining a plurality of stubs, a first and a second end of a plurality of inconel pipes; welding the stubs with the first end of the inconel pipes forming a water connector assembly; machining of a base plate; welding the base plate with the water connector assembly; machining the base plate welded with the water connector assembly, wherein machining further comprises milling of plurality of cooling channels across angled plane of the base plate welded with the water connector assembly; closing of plurality of cooling channels located on the base plate welded with the water connector assembly; and welding each of plurality of external hydraulic circuits with the second end of each of the plurality of inconel pipes.

A tool includes a coupling, an inner adjustment sleeve, and an outer adjustment sleeve. The coupling connects a rotary tool to the inner adjustment sleeve. An adjustable portion of the inner adjustment sleeve is threadedly received in the outer adjustment sleeve. An offset aperture in the free end of the outer adjustment sleeve receives a tip of a valve stem for grinding. An optional cup at the end of the outer adjustment sleeve stabilizes the tool. A grinding bit with a shaft retained in a collet of the rotary tool is contained internally, in a channel, extending through the tool.

A tool includes a coupling, an inner adjustment sleeve, and an outer adjustment sleeve. The coupling connects a rotary tool to the inner adjustment sleeve. An adjustable portion of the inner adjustment sleeve is threadedly received in the outer adjustment sleeve. An offset aperture in the free end of the outer adjustment sleeve receives a tip of a valve stem for grinding. An optional cup at the end of the outer adjustment sleeve stabilizes the tool. A grinding bit with a shaft retained in a collet of the rotary tool is contained internally, in a channel, extending through the tool.

A grinding stroke control device for a valve stem grinding apparatus is fixed to a processing machine and provided for gripping a valve stem or a test bar. Using the hand wheel, the dial gauge and the positioning seat can obtain an initial position, then moving the measuring meter of the positioning mechanism along the transverse direction to make sure the valve stem has the right length with a standard valve clearance. By such arrangements, the grinding stroke control device for a stem valve grinding apparatus of the invention can have a less complicated structure and therefore is more convenient to operate.

A grinding stroke control device for a valve stem grinding apparatus is fixed to a processing machine and provided for gripping a valve stem or a test bar. Using the hand wheel, the dial gauge and the positioning seat can obtain an initial position, then moving the measuring meter of the positioning mechanism along the transverse direction to make sure the valve stem has the right length with a standard valve clearance. By such arrangements, the grinding stroke control device for a stem valve grinding apparatus of the invention can have a less complicated structure and therefore is more convenient to operate.

A wafer grinding method includes grinding a central portion of a wafer by using a plurality of abrasive members annularly arranged so as to form a circular ring, thereby forming a circular recess at the central portion of the wafer and simultaneously forming an annular projection around the circular recess, recognizing a height of a grinding unit after grinding the center by using a height recognizing unit and next storing the height recognized above, and grinding an upper surface of the annular projection to a predetermined value for a height of the annular projection previously set by a setting section as a grinding end height where the grinding of the annular projection by the grinding unit is ended.

A wafer grinding method includes grinding a central portion of a wafer by using a plurality of abrasive members annularly arranged so as to form a circular ring, thereby forming a circular recess at the central portion of the wafer and simultaneously forming an annular projection around the circular recess, recognizing a height of a grinding unit after grinding the center by using a height recognizing unit and next storing the height recognized above, and grinding an upper surface of the annular projection to a predetermined value for a height of the annular projection previously set by a setting section as a grinding end height where the grinding of the annular projection by the grinding unit is ended.

A component according to the disclosure may include: a rotatable body having an aperture therein for receiving one of a turbomachine shaft or a lathe chuck, wherein the aperture is oriented substantially axially relative to an axis of rotation of the rotatable body; and a flange coupled to and in direct axial contact with the body, the flange including a surface that extends axially relative to the axis of rotation of the body, wherein the surface of the flange comprises a matingly engageable face configured to contact an axially aligned surface during operation of the component, the matingly engageable face having a burnishing indentation thereon, wherein a surface roughness of the surface of the flange is less than a surface roughness of a remainder of the flange, and wherein a compressive stress of the surface of the flange is greater than a compressive stress of the remainder of the component.

A component according to the disclosure may include: a rotatable body having an aperture therein for receiving one of a turbomachine shaft or a lathe chuck, wherein the aperture is oriented substantially axially relative to an axis of rotation of the rotatable body; and a flange coupled to and in direct axial contact with the body, the flange including a surface that extends axially relative to the axis of rotation of the body, wherein the surface of the flange comprises a matingly engageable face configured to contact an axially aligned surface during operation of the component, the matingly engageable face having a burnishing indentation thereon, wherein a surface roughness of the surface of the flange is less than a surface roughness of a remainder of the flange, and wherein a compressive stress of the surface of the flange is greater than a compressive stress of the remainder of the component.