Nowadays, the cymbals are made of high-speed rotating saw blades. The precision is very high, the cross-section is very flat, and the hand feels as smooth as the mirror surface. The enamel is combined and the cross-section is very tight. It is necessary to use it again. Pull the saw again?
Work needs, from time to time to tour the large and small mahogany furniture workshop workshops, a basic age of woodworking is slowly being discarded. This basic skill is "staying live".
The times are changing, the tools are changing, and the processes are naturally changing. Some processes are subject to change, simplification, or even omission based on changes in the tool. For example, most of the manual hoes, cutting materials, and planing are changed from manual to electric; traditional syllabic grass grinding is almost completely replaced by sandpaper; however, not all processes can be discarded, and “sporting†is among them. A very important one.
"Wheeling" and "brake seam" actually say the same thing, "swimming" is the gap. The tool used is called "brake saw", and the brake saw is usually a wrist saw.
Of course, there are other different appearances. Generally, a mature woodworker must have four different sizes of brake saws. Of course, the times are improving, and the brakes of the new era can grow like this:
How to do the work of the brakes, specifically, before the structural assembly of the concrete structure is completed, the interfaces of the concrete structure are pulled again. Why are you pulling this time?
When the factory was inspected, this request was once questioned by several carpentry sites for a good reason. Nowadays, the cymbals are processed by high-speed rotating saw blades. The precision is very high, the cross-section is very flat, and the hand is as smooth as the mirror. The cymbals are combined and the cross-section is very tight. Why should we reuse them? Pull the saw again?
It is very necessary, and the smoother the cross section is, the more necessary it is.
Because the brakes do not make this cross section more flat, but make it more "rough".
You must have an impression of the tires. The tires here are the inner tubes of the tires, not the vacuum tires of the car. Before the master repairs the tires, he must use the enamel to lick the two adhesive faces of the rubber. The purpose is to increase the contact surface and increase the bonding surface.
The principle of the brakes is similar to the principle of this trick.
The high-speed rotary cutting of modern woodworking machinery, the cutting edge of the tool and the hardwood masonry hard fiber hard, instantly generate high temperature and high pressure, and even burn the steamed bread and shoulders. After extrusion, the wood veins are closed and the surface changes. It is very smooth. When the æ¦«å¯ is combined, the shoulder can be very tight, and even it is difficult to distinguish the gap, but the too smooth surface makes the frictional resistance of the æ¦«å¯ bond greatly reduced, and the glue used for bonding only forms a thin film, the adhesive force Greatly reduced, the firmness of the combination is not high, and the furniture as a whole is easy to loosen prematurely. Therefore, we often see the gaps in the furniture interface early, and it is a very important reason why it does not work.
We are not going to make the cross-section saw of the æ¦«å¯ contact smoother, but to use the brake saw to make the cross-section saw more hairy. The sawing teeth at the shoulders are staggered, so that the wood fibers in the two parts of the contact surface are fluffy, and the rigid and tough wood fibers are three-dimensionally intersected, which increases the contact area, and then assists the natural silicone adhesive to add glue. The penetration area and depth can achieve the effect of three-dimensional bonding.
After a partial enlargement of the shoulders of the brake sawing brakes, just like the Velcro strap on the garment, when the hook strap and the velvet strap are combined on both sides, the soft nylon loops are hooked by the stiff nylon hooks. The buckle effect, a slight pressure, can produce a large fastening force and tearing force.
Although the wood is now dried, its residual growth stress will remain in the wood for varying degrees. The residual growth stress increases with increasing humidity, and the wood without residual stress is carbon. For the same piece of furniture, the wood fiber has different stress depending on the growth position of the raw material. Through the brake process, the joint between the parts is connected to the irregularity of the material, and the stress is self-balanced between the parts, which helps to greatly reduce the shape of the furniture parts under the change of the environment. And chapped, especially in the four sides of the furniture process.
Another excellent example of the advantage of the brakes is the bucket process. Take the perimeter of the curved arhat bed as an example. Anyone who has not been braked can see a clear gap during the grinding stage. This is actually telling people that the internal structure of the cockroach has appeared loose.
The details of the curved ruler are like this:
Comparing the curved arhat bed that I saw, I believe that the difference is not small. Among the mahogany manufacturers that come into contact, there are very few factories that still insist on working.
The brake process seems to be simple. In fact, it takes a lot of effort to master it. The old craftsmen of that year must practice for one or two years.
First of all, the repair and maintenance of the brake saw is very hard, because the sawtooth is small, the sawing is thin, the old-fashioned eye-cats are not easy to trim well, the brakes and the craftsmanship are so old, and it is difficult to get a good job without a good saw. This is the reason that "workers want to do their best, they must first sharpen their tools."
The brake saw is different from the hand saw such as the broken shoulder saw and the open saw. The hardness of the saw blade, the size of the saw tooth, the arrangement of the sawing path and the opening angle of the saw tooth have strict requirements.
The hardness is moderate, the saw blade is required to be moderately soft and hard, and the steel port is hard but not brittle. The steel bar of the saw blade is brittle. It is easy to break the teeth when the saw teeth are twisted. The steel mouth is too soft. When the brake is live, it encounters the hard mahogany material. The saw blade is easy to twist, so the shoulder is not tight.
Sesame teeth, the teeth of the brake saw should be as small as possible, and processed into the size of sesame seeds during the sawing, so it is called sesame tooth.
The three-way tooth, the saw saw tooth is a three-way tooth, and the sawtooth is manually arranged in the left, middle and right, which are arranged in a staggered shape. The key point of the technology is that the opening angle of the left and right teeth is not along the entire length of the saw blade. The same, but the central part of the opening angle is more than two ends.
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