The carpenter's hand saw was one of the first tools used in traditional carpentry. It was invented by Lu Ban, the founder of carpentry, based on a plant with sawtooth leaves. There is an article about this in elementary school textbooks. Remember? His invention started the improvement of furniture, but many enthusiasts and beginners are prone to pinching and deflection when using it.
Let's talk about how to avoid this situation.
1: How to avoid sawing wood? Eliminate the cause in the wood itself, and everything else in the saw blade. Firstly, newly bought saws are not ground, and all saw teeth are in a straight line, after buying saws, we need to process the adjustable teeth ourselves. There are several methods of tooth displacement. The specific use of each method will not be discussed in detail here.
A: left and right. That is, one saw is turned to the left, and the next to the right.
Shift pattern left and right
B: left center right. That is, one limb is turned to the left, the next one will not ring, and the third will ring to the right.
Scheme of the left, middle and right teeth
C: left and right. That is, two dials to the left, and the next two dials to the right.
Scheme of left, right, left, right tooth displacement
We usually use method A. When shifting teeth, pay attention to the same left and right angles. However, when sawing cork, you should pay attention to the angle of the saw teeth. The angle at both ends of the ring gear should be less than the middle so that the wood will stretch and rot along the edges.
The two ends gradually move into the middle
2: Let's talk about the problem that the saw does not cut along the ink line during use.
A: The saw blade is bought and used directly, without setting the teeth. Or the saw blade is not stretched enough.
B: The transmission angle is uneven, the left side is larger than the right side, or the right side is larger than the left side.
C: The angles between the two ends of the gear and the saw blade do not match, and the saw blade is twisted
The teeth are uneven and the side with the higher sawtooth angle is pressed harder by the wood, while the other side with the lower sawtooth angle is compressed less and therefore tends to move to one side.
In addition, the angle between the gear and the saw blade must be the same at both ends, otherwise when the board is opened, one side will form a straight line and the other side will form an S-shaped line. Opened boards are uneven and uneven in thickness.
The two ends are at the same angle. The saw blade holds the plane
You should also pay attention when grinding the teeth. The angle between the file and the saw blade should be 90 degrees. The angle of the file should correspond to the angle of the teeth. frequency.
Ensure every tooth is sharp and the saw height is the same
The angle between the file and the saw is constant