| 摘要 |
PURPOSE:To form a notch quickly by cutting the bottom of a workpiece in the thickness direction and plane direction alternately using a round saw, thereby removing the bottom of the work, and thus lessening the amount of machining in giving notch to the bottom of work. CONSTITUTION:In a specified depth, the right bottom of a sash 1 is machined fore and aft by the use of a round saw S, 45 deg. inclined to a horizontal line, and thus a primary longitudinal groove 2 is formed. Then another horizontal round saw S cuts the right bottom of the sash 1 fore and aft from the right end face 1a in the depth reaching the deepest point of this primary longitudinal groove 2, and the right bottom 1b of the sash 1 is cut off to form a first state primary notch 3. After a secondary longitudinal groove 4 is formed in the same manner, machining is made fore and aft from the bottom surface 3a of the notch 3 in such a depth as reaching the deepest point of this secondary longitudinal groove 4, and the right bottom 1c of the sash 1 situated at the left of the notch 3 is cut off so as to form a first state notch 5. In this fashion a second stage primary notch 7 is formed from the tirtiary long. groove 6 while a second stage notch 9 formed from a fourth degree long. groove 8, and thus end notching of the sash 1 is completed. |
