How to reset to zero. First, let's look at the classification of sights. There are many types of sights we commonly use. Here we use the commonly used Kepler telescope sights as the object of illustration. In this example, the 118 type sights Take an example to illustrate the method of zeroing. A conventional gunsight, except for the eyepieces and objective lenses at both ends, is the ballistic adjustment mechanism in the middle of the lens body. In the middle of this type 118 gunsight, you can see that there are two on the top and the right side. Ballistic adjustment device, open the cover of your adjustment device. You can see the dial with ballistic adjustment. (As shown in the picture) Because this sight is a single-channel manual adjustment type, and there are anti-skid patterns on the side, so you don't need a screwdriver, you can turn it left and right with your hands. At this time, you can see both the upper and right dials. There is 1clock 1/4" 100yd. This means that you adjust one frame (that is, you will hear or feel a click when you turn the dial manually). At a distance of one hundred yards, the ballistic value will change by a quarter inch (6.35 Mm). In addition, there is an arc line on the upper dial, the line has an arrow in the clockwise direction and the counterclockwise direction, and there is a 0 in the middle of the line. The clockwise direction is written Down, and the counterclockwise direction is written It is Up, which means that if you turn clockwise, the impact point will go up when you shoot again. Turn the impact point counterclockwise and it will go down, and there is the same curved line on the dial on the right, and the clockwise direction is Left, Right is written in the counterclockwise direction, which means that if you turn clockwise, the bullet point will turn to the left when you shoot again. Turn the bullet point counterclockwise and it will turn to the right, (as shown in the picture). To be installed, when the rifle sight is mounted on the gun, its optical axis cannot coincide with the trajectory of the gun. Generally, the gun needs to be re-calibrated. To put it more professionally, it is called zeroing.
The home-made 79 sniper rifle and Type 85 sniper rifle are reset at 300 meters. The civilian gas gun can choose 15 meters or 20 meters. I have not touched the scope, but if it is a hand crossbow, it can be adjusted by 10 meters, and the cloth gun crossbow can be adjusted by 25 meters. Suppose you are using Qi GUN and you have selected the target paper. First of all, make sure your riflescope is installed on the guide rail stably, the mirror body is not tilted, and it can be measured by crosshairs. If it is a long-range firearm, the slight inclination of the crosshair will cause a serious deviation of the impact point. If you have a spirit level, you can set the gun horizontally and use a plumb line to confirm. If the requirements are not high, just look at it. Start the calibration target paper and shoot three times at the target with the gun in a stable shooting attitude at the zero distance. The scope then uses a straight ruler to connect the three impact points. And find the center of gravity. If the impact point is at the bottom left of the bullseye. You use a ruler to measure the horizontal and straight-line distance from the bullseye to this center of gravity. This is the average deviation. We assume that you are using 10M for the zero test. At this time, you use a ruler to measure the horizontal distance between the impact point and the bullseye as 42MM, and the height distance is 60MM. At this time, the conversion shows that the distance is 10M (because the code is close The distance is not much different from the metric unit, so 10M is calculated as 10YD) For horizontal distance, you need to turn the right dial counterclockwise (42/6.35X10=66.14) about 66 divisions.
The algorithm of the height dial is also very simple (60/6.35X10=94.48), you need to turn the upper dial 95 divisions counterclockwise. After this adjustment, try shooting again. If you find that there is no coincidence, shoot three more shots, mark the position of the center of gravity, re-measure, and then adjust the dial after measuring the distance. Generally, it can be reset to zero after three calibrations.
