How to draw lines on four-legged and eight-legged stools

The four-legged and eight-legged stools are drawn as follows:

The four-legged bench looks simple, but it is not easy to do it well. Many carpenters can do it, but it is difficult to grasp that after it is installed, its four legs are not on the same level. As far as I know, every carpenter's practice can be said to be different, and some use mathematical formulas, geometric patterns and CAD drawings.

Sketch masters and other software have been used. Think about how an old carpenter in the 1950s and 1960s made a well-made stool without knowing any formula, software or even words. In the hands of modern carpenters, how can they not do it well?

1 First of all, you should make a bench. You should prepare a piece, put down a wooden board the size of a bench, lie flat and tilt the ruler. First, draw a plan (actually four lines) of the slope required by the bench on the board. There is no specific number for the slope. It depends on how high the bench is, and you can play as you like.

2. After drawing the required line on the board, adjust the angle of the crutch according to the inclination of the line, then make a cross brace and tenon hole of the leg to make a false combination, and draw a line on the cross section of the table top (more than gourd painting ladle).

3. Then draw a line on the side of the table and turn a straight line on the top and bottom of the table. The intersection point is the tenon hole, which may be a bit complicated. Look at the picture and you will understand. Traditional carpentry, four-legged bench marking tutorial is simple and clear.

4. When drilling the tenon hole, drill it obliquely and plant it on both sides. It is not allowed to directly drill through (hand-made) the machine on one side.

5. After assembly, saw off the exposed tenon and planed it flat. I forgot to mention that the glue must be put in. Many people think that traditional carpentry should not use glue and nails. This is not right. Nails have never been used in ancient times, but glue is different. No matter what connection structure is used in traditional carpentry, it is glued.

It used to be swim bladder glue, pigskin glue, and then bone glue, and now it is also widely used. Although it needs to be cooked with fire, it is very effective and strong, and there are all kinds of modern chemical glue.