Connection area to seam passage of cylinder was recessed.
蒸気通路とシリンダーの接続部分をエンドミルで彫り込む。
Feeding depth of steam passage was checked.
蒸気通路の穴あけの送り量確認。
The steam passage was drilled.
蒸気通路の穴あけ。
Last part was hand-drilled.
最後の部分はやはりピンバイスでゆっくり開けた。
Finished steam passage.
蒸気通路穴開け完了。
I made a jig for drilling the mounting holes of the drill cover. I bored the centre hole before, but this time I cut it by 12mm slot drill. However cut a hole on MS with this size of slot drill seemed exceeding the capacity of my mill and the hole was made bit bigger.