[[[CP|W:210|H:140|A:C|U:file1.qidian./chapters/201110/30/1343635634555859318562500323148.jpg]]]] The picture shows a gunsmith in Peshawar, Pakistan, drawing rifling with a homemade manual rifling machine, and his craftsmanship is no different from that of the early 16th century. 1. Scraper method

A steel rod slightly larger than the inner diameter of the pistol, a groove is carved in a specific part of the pistol, and a piece of carbide steel is installed, and one or two convex bands with a certain angle of inclination are mounted, and the front end has a sharp part, and the height of the protrusion can be adjusted. Pull back and forth on a rifling position dozens of times, cut a secondary rifling line, and then adjust the position and cut and scrape the next one. In this method, a single scraper is generally used to cut odd or even rifling, and a two-way scraper can be used to cut even rifling. It is also possible to install single, double or triple blades in opposite positions to cut out 2 to 6 rifling lines at a time.

2. Hook knife broaching method

The hook cutter is placed on a steel tie rod that is slightly thinner than the diameter of the breech, and the height of the hook scraper blade can be adjusted by adjusting the screws on the tie rod layer. Each time the pull passes through the barrel, the lever moves a few microns, and with the uniform rotation of the barrel, a certain winding rifling is pulled, and after reaching a predetermined width, the second rifling is pulled in a different position. Early rifled guns only needed to pull a rifling wire about 20 times, while a better gun had to pull the same rifling wire about 100 times. The more times you pull, the finer and more precise the groove formed.

3. Combined ring knife broaching method

25 to 30 large alloy steel rings are fixed on a tie rod, the distance between each steel ring is equal, each steel ring is machined with the same number of equal-distance scrapers as the number of rifling wires, each cutter can be connected with the cutter on the next ring according to its entanglement, and can be regarded as a spiral line from the beginning to the tail. The protrusion of the cutting edge on each ring is slightly greater than that of the previous ring, forming a series of cutters, the grooves cut have a stable width, depth and spacing, and this combination of ring broaching knives passes through the chamber - times. The whole rifling can be cut, the working time can be shortened, and the output and quality can be improved.