May I ask what the longitude line of the head is? ? ?
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Someone who knows can give me some advice.
The meridian of the head refers to the intersection of the outer or inner surface of the head and the plane passing through the axis of the head.
I still don’t understand. Could you please send me a simple diagram to illustrate?
It will be easier to understand if you remember to distinguish the longitude and latitude lines of the earth.
I agree with what you said above, just remember the longitude and latitude lines of the earth to distinguish them. Place the head horizontally on the ground, and the line that is connected to the cylinder is the latitude line. The line that passes through the axis of the equipment and is perpendicular to the latitude line (or that the center line of the equipment is perpendicular to the tangent line of the head) is the longitude line.
If you still don’t understand, just buy a watermelon and cut it a few times and you’ll understand. Ha ha
If the header is spliced, then it is, if not, then it is not.
Put the head on the ground, the highest point is the pole, draw the shortest line along the surface of the head to the ground through the pole, and countless longitudes can be drawn...