I reshaped the die to this form and could cut thread. However comparing to proper one still the cutting edges were not seemed good. I may try further shaping later.
I have some dies from the same manufacturer “SKC”. M3 in them had a problem as well. I ground it as same as M1.7, but it did not cut in at all. This manufacture, “SKC”, is real crap. I will never buy anything made by “SKC.”
ここまで削ったところ切り込めるようになりました。でも上の正しいYAMAWAの物に比べるといまいちの刃先ですね。もう少し修正したほうがいいかもしれません。
実はほかにもこのメーカー「SKC」のものがあるんですが、M3がやはり全然ダメ。M1.7よりひどい。同様に削ってみたんですが全然くいこまない。もー、こんな糞メーカーの製品は絶対買わんぞ。