How to mark the line.Kanawa tsugi Japanese ver.金輪継墨付 宮大工が職人技で教える初心者のための動画 

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The use of central reference lines is very standard for scibing post and beam joinery. Here is a bit of commentary. Sensei emphasizes that you must choose two adjacent faces and verify that they are flat and square to each other. He carefully marks them with "0" Here is why. They are reference faces going forward. This allows him to accurately scribe a center line on each face. Two center lines on two faces are referenced from each reference face, never from the other two faces. I.e. the fence on the marking gauge only rides against a reference face. In this way, opposite faces are marked exactly the same distance from each reference face. You must understand this to produce this, and many similar joints. He does not mention it here, but elsewhere he explains that those four reference lines are really offsets of a true center line he has now established inside the beam itself where their 90 degree planes intersect. See his video about marking out naturally shaped timbers for that concept. He does say in this video that the reference line/lines does/do not need to be precisely 1/2 the width of the beam, since if you consistently measure from the reference faces the four lines you scribe will still precisely line up to represent the theoretical internal real reference line. He implies that the joint will still form properly even if the reference line is not precisely centered in the beam because the 4 offset reference lines still describe the true inner line accurately. Two more points. Sensei then establishes another set of reference lines at the mid point of the joint at 90 degrees to the first 4 reference lines. Together they form a plane. So 8 reference lines are needed for this joint, 4 parallel running lengthwise, and 4 which wrap around the beam, at the center of the joint. Notice his very consistent use of a "z" symbol for these 8 reference lines, "x " as a sawing line, and a flick for an area to chop out.

すごく勉強になりました。 バツ印は墨払い、その他は墨半分で切るのでしょうか？

楽しみに待ってます

Great video 👍

なるほど、なるほど！フルコースを楽しみにしています。

ちなみに、ルーラーの幅は何ミリですか？😅