How to straighten the carpenter's ink line?

Use cotton thread for inking. Cotton thread absorbs ink to reduce winding times. After the thin thread bounces, the stitch is clear. Ink, writing ink and ink lines are not easy to fade. The lifting force should be uniform, and the two ends of the line and the lifting point must be in a straight line, so that the ink line will not be biased. Draw a straight line on the wood or wall, pull the line dipped in ink out of the ink box, fix both ends, lift the line from the middle, and then let go, only to hear a bang, a straight black line coming.

Thin threads usually made of silk can also be made of cotton thread. Drill a small hole by hand before and after, and the ink line will pass through it. When it passes through the ink cartridge, it can retain a certain amount of ink. There is a hammer at the end of the ink line. Due to the limitation of materials, a beautiful wire hammer was not made, and it was temporarily replaced by an iron nail.

The tool used by the carpenter is an ink box. The thickness of the wood is determined by measuring the size of the sawn wood, and then two points are drawn as the thickness of the wood at both ends. The ink box is filled with ink, and it is pulled until it is tight, and both ends are aligned with the first two points. When the ink line is pulled up and let go, there will be ink marks on the wood. If it is a tunnel saw, there will be no uneven thickness of wood according to the straight saw.