Thread plug gauge with maintenance line, thread ring gauge, and method of manufacturing the same

A method of manufacturing a thread plug gauge with a maintenance line comprising:

• connecting a thread plug gauge body to a negative electrode base connected to a power supply box which controls a current;
• setting a green stencil which has a cut-out portion having a desired marking pattern and from which an electrolytic solution exudes on a carbon filter with the electrolytic solution being contained in a positive electrode handle connected to the power supply box;
• energizing the positive electrode handle while gripping the handle;
• and
• forming a wear checking gauge line on a male thread portion and a female thread portion of a go-side thread measuring portion or a male thread portion and a female thread portion of a not-go-side thread measuring portion of the thread plug gauge body by performing a marking process by sliding the positive electrode handle on the male thread portion and the female thread portion of the go-side thread measuring portion or the male thread portion and the female thread portion of the not-go-side thread measuring portion of the thread plug gauge body to form a concave shape which has a depth of 0.3 μm to 0.4 μm and a width of 0.2 mm and is blackened;
• or
• forming a wear checking round point on the male thread portion and the female thread portion of the go-side thread measuring portion or the male thread portion and the female thread portion of the not-go-side thread measuring portion of the thread plug gauge body by performing the marking process without sliding the positive electrode handle on the male thread portion and the female thread portion of the go-side thread measuring portion or the male thread portion and the female thread portion of the not-go-side thread measuring portion of the thread plug gauge body to form a concave shape which has a depth of 0.3 μm to 0.4 μm and a diameter of 2 mm and is blackened.

A method of manufacturing a thread ring gauge with a maintenance line, comprising:

• connecting a thread ring gauge body to a negative electrode base connected to a power supply box which controls a current;
• setting a green stencil which has a cut-out portion having a desired marking pattern and from which an electrolytic solution exudes on a carbon filter with the electrolytic solution being contained in a positive electrode handle connected to the power supply box;
• energizing the positive electrode handle while gripping the handle;
• and
• forming a wear checking gauge line on a male thread portion and a female thread portion of a go-side thread measuring portion or a male thread portion and a female thread portion of a not-go-side thread measuring portion of the thread ring gauge body by performing a marking process by sliding the positive electrode handle on the male thread portion and the female thread portion of the go-side thread measuring portion or the male thread portion and the female thread portion of the not-go-side thread measuring portion to form a concave shape which has a depth of 0.3 μm to 0.4 μm and a width of 0.2 mm and is blackened;
• or
• forming a wear checking round point on the male thread portion and the female thread portion of the go-side thread measuring portion or the male thread portion and the female thread portion of the not-go-side thread measuring portion of the ring gauge body by performing the marking process without sliding the positive electrode handle on the male thread portion and the female thread portion of the go-side thread measuring portion or the male thread portion and the female thread portion of the not-go-side thread measuring portion of the thread ring gauge body to form a concave shape which has a depth of 0.3 μm to 0.4 μm and a diameter of 2 mm and is blackened.