①The materials choice
I use materials of the line diameter of φ 1.66 for the machine screw of example) 2 millimeters
I cut materials and devote myself to a brain to a cross and minus.
The screw is not yet made. I am called a screw bottom or a blank, a rivet for a pre-stage to become the screw.
After materials cutting, I do not use this punch immediately.
The capacity (quantity of meat) to use for a head must do the preparation that I looked good with each to change by a kind, the dimensions of the head.
The inside ： The part used for a shape (mushroom shape) head most is thick.
The right ： The second shape (the state that a cross was hit, screw bottom, blank, state to be called a rivet)
As a model was necessary for the heading each, the model of the rolling uses an appropriate model by the kind of the size screw, too.
If it is M1 .4, pace 0.3, M2 are in condition that Yamaya of pace 0.4 has been already carved.
The mountain swells, and a screw lower blank retires itself in the valley by pressuring it from both sides, and putting two models.
When I move clay before and after fastening with both hands repeatedly and do it into long pieces, are there not irregularities (mountain, valley) to the clay which narrowed with the irregularities of a hand and the finger?
I do not sharpen it. It is a similar principle.
As a thread is molded while a screw lower blank turns, I am called rolling.
As they do not sharpen a valley with a blade, most of the waste does not appear.
It becomes like this in the machine inside.
When I eat it, and a model has a blank.
At this time, the screw has been already completed.
The precision screw uses the small thing of the mesh of a net.
In the case of a miniature screw of the iron, there is much nickel plating.
In stainless steel materials and the brass materials, there are many cases of the removal of fat washing.