How about the handcrafting process of traditional steelyard?

The traditional manual manufacturing process of the scale includes selecting the scale wood, planing the scale, setting the mouth, installing the mouth, welding the copper bag, installing the mouth to weigh the plate, setting the scale and fixing the star, nailing the star, grinding and cleaning, dyeing and coloring the scale, trimming and polishing, and auxiliary processes.

1. Selection of beam materials: Nanmu is generally used for large-scale scales, and "Populus davidiana" produced on the zhongyang slope of Qinba Mountain is mostly used for small-scale scales. If the wood is dried in the shade for more than one year, it should be sawed to a suitable length according to the weighing requirements of the scale to be made.

2. Planing the balance beam: firstly, use the positive planer to plan the circle according to the craftsman's experience to reach the appropriate size, and then use the reverse planer to clean the burr and preliminarily polish the balance beam.

3. Setting the "mouth": Two craftsmen cooperate to use the Mo Dou, and several vertically equal ink lines are popped up on the weighing beam with a string.

4. Installation of "scratches": Hold the balance beam from bottom to top with a knife in one hand, and find out the positions of the three "scratches" on the balance beam through measurement; Fix the balance beam, drill a vertical hole at the position where the "handles" are installed (once with a hand drill and then with an electric drill), and try to install three "handles".

5. Copper clad welding: Both ends of the weighing beam need to be covered with copper skin. Cut the copper skin prepared in advance according to the required size, put the cut copper skin on the end of the weighing beam for comparison and trimming, and then weld the copper skin with solder. For convenience, you can also wrap the copper bag with small nails. For the sake of beauty, the copper-clad parts at both ends of the balance beam should be processed in advance to make its diameter slightly smaller than the rest, and polished slightly with a sheet metal file.

6. Install the "handle" and the scale: the scale is prefabricated, and the three ropes on the scale are tied to the outermost "handle" at the big end of the scale.

7. Calibration of scale and setting of stars: Lift the scale with a "fork", put weights with different weights into the scale in turn, measure the distance on the scale, divide the scale with a two-legged compass, and carefully mark the positions of stars and flowers.

8. Nailing stars and flowers: According to the position marked in the previous step, drill out small flower spots manually with a belt, insert fine copper wires into the drilled holes, then cut them out and hammer them.

9. Grinding and cleaning: further grinding and smoothing the weighing beam along the longitudinal direction with a steel file and an oilstone; Brush a layer of lime water evenly on the newly made weighing beam to remove oil stains. After limewater is naturally dried, rinse it with clear water.

10, beam dyeing and coloring: Nanmu beam can make use of its natural wood color. After washing with lime water, brush a layer of soapy water alum solution on the poplar weighing beam, and then dry it; Then evenly brush the prepared gallnut solution, and hang the weighing beam again to make it completely dry. This time, it usually takes 12 hours.

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12, auxiliary technology: people who can fully master the manufacturing technology of steel scales must also have the ability to make iron scale hooks; Making the hook is actually a blacksmith's tool. The tools and equipment used, such as coal stove, anvil, long tongs, hand hammer and sledgehammer, have the same technology as the blacksmith.

Baidu Encyclopedia-Making Skills of Traditional Scales