stone mountain carving generally requires a large model or a small model to form. There are two commonly used copying or magnification techniques, one is the dot line instrument magnification method, and the other is the center equal ratio magnification method. These two methods can basically solve the problem of copying and enlarging figurative shapes, but they are too mechanical, and the stone carvers do not fully understand the shape of the prototype. Stone mountain sculptures often resemble the prototype in large shape but have no charm. It is very convenient to choose the free coordinate line method, which can get twice the result with half the effort, and can solve the charm problem of stone mountain carving. stone mountain carving workers who have used this method generally report better. Specific steps:
1. Find the horizontal plane at the bottom of the prototype, place it on a flat plate with a coordinate grid, draw the line where the flat plate intersects along the bottom edge of the prototype, so that the prototype can be put back to the original place repeatedly, and find the cross coordinate line on the bottom edge of the prototype . The vertical line of the coordinate line should pass through the high point of the prototype.
2. Use two steel angle rulers to place a standard long square in parallel so that there is a distance of about 3 cm between them. Put it vertically on the flat plate, the right angles of the two steel rulers are on the same coordinate line, let the pencil lean on the two steel rulers, slide up and down, left and right, you can mark a very accurate space vertical line on the prototype, use the same method Find the four vertical lines front and back, left and right, and the four lines will intersect at one point. In this way, the basic plane coordinates and space coordinates are established. And no matter what kind of turning point can draw a vertical line.
3. Freely choose the space coordinate lines and coordinate points on the prototype. The principle is to mark the front coordinate lines and points on the wider front; mark the side coordinate lines and points on the wider side. The way to find coordinate lines and points is the same as the second step. Note that the front coordinate line and the side coordinate line must be staggered. To make a scale for the coordinate points, it should be marked from the vertical line of the center coordinates to both sides, such as: left 1, 2, 3, right 1, 2, 3 and other recesses should also be marked clearly.
4. Find out the coordinates of the bottom surface on the selected stone, and cut out the plane in time. Use the bottom plane as the standard to find the space coordinate line on the stone. Find out the main coordinate lines and points of the front and side by zooming in on the scale, and use it as a basis to cut off the wilderness. Then re-mark the disconnected coordinates, continue to find other coordinate lines and points, and constantly cut off the redundant parts. The more coordinate lines and points you find, the more accurate the shape will be, and the closer the charm will be to the prototype.
5. In order to save effort, thin and tall works can be processed lying on the ground. As long as the exact coordinates are marked, there will be no visible errors.
6. Then trim the details. Sculpt transitions and transition lines more smoothly. Then complete the processing of small parts. This method is more practical for enlarging, duplicating, and reducing the processing of stone. After one practice, you can master this technology. This technique is also suitable for reproduction, enlargement and reduction work of clay sculpture.
