The violin is often used for a long time, and it is a normal phenomenon to have more or less noise, because you use it every day, so don't be afraid of the problem of the violin, just solve it in time, overcome it, and master the correct method, for us There is no problem at all.
First of all, we consider the bridge of the violin, the diagnosis and elimination methods of the noise caused by the bridge:
1. Diagnosis method for the noise caused by the piano bridge: put the headstock on the wall padded with the towel, and while playing with the bow, press the two corners of the upper edge of the piano with the left finger, and look at the volume. While slightly reducing, does the noise noticeably disappear a little. Then tilt the bridge forward, backward, and move it left and right to see if the noise disappears a little.
2. The type of noise caused by the bridge:
①. The polished radian of the two feet of the piano code is inconsistent with the radian of the butterfly piece of the panel, which leads to the lack of close contact between the piano and the violin panel, and there are gaps in different situations. There is a gap and noise is generated.
②. The bridge is tilted forward or backward, resulting in a gap on the side of the bridge foot toward the fingerboard or the side of the tailboard, resulting in noise.
③. The position of the piano code on the butterfly plate of the panel is shifted left and right, resulting in a gap in contact with it. When the deviation is serious, the force will be biased to one side of the horse's foot, so that the other side of the horse's foot will be less stressed, resulting in a squeaking noise in the gap.
④. The texture of the bridge itself is soft, or if it is used for a long time, it will cause the hollow seam of the bridge to touch and produce noise.
⑤. The quality of the bridge itself is soft or the edge of the bridge is too thin, which causes the strings to be embedded too deeply into the bridge and produce noise, especially the thinnest strings.
⑥The upper edge of the bridge is polished too low, so that the height of the strings from the fingerboard is not enough, resulting in noise when the strings touch the fingerboard when playing under heavy pressure.
3. Elimination method of noise caused by piano code:
For the first type, the bridge must be carefully re-polished.
Types ② and ③ should be carefully adjusted.
Types ④, ⑤, ⑥ have to be replaced with new codes.
Then we consider the violin's nut, the diagnosis and exclusion method of the noise caused by the nut:
From the cross-section of the nut, it is a 90-degree fan. The starting point of tangent between the strings and the nut, that is, the turning point of the strings, should be the edge on the side of the fingerboard, which must be far from the fingerboard. The height of the highest point is determined by the feel of the finger when playing, which is generally the height of a bank card.
1. Diagnosis method for noise caused by the nut: there is a slight squeak when a certain string or all strings are empty, and the noise disappears when a string is pressed or fully pressed.
2. The type of noise caused by the nut:
① The nut is thin and the edge height is not enough, so that the gap between the strings and the fingerboard is not enough, resulting in the strings touching the fingerboard when the strings are empty, resulting in noise.
②. The radian of the nut is incorrect, the edge is low, and the starting point of the string is moved backward, resulting in a gap between the string and the edge, resulting in noise.
3. Due to improper production or perennial tuning wear, the string groove is too deep, so that the gap between the strings and the fingerboard is not enough, resulting in noise when the strings touch the fingerboard when the strings are empty.
④. Due to improper production or perennial tuning wear and tear, the string groove is wide, causing the strings to vibrate between the groove walls on both sides, resulting in noise.
3. How to eliminate the noise caused by the nut: use a blade (utility knife or old-fashioned razor blade) to cut from the gap between the nut and the fretboard, and then use a utility knife or a carving knife to slowly sew from the top of the nut Cut in so that the nut comes off.
In the first type, a piece of wood of appropriate thickness can be lined under the nut to slightly raise the nut;
Types ②, ③, ④ can grind the curved surface of the nut correctly, and then insert a piece of wood of appropriate thickness under the nut to slightly raise the nut. If you are afraid of damaging the baby violin, then use the method of padding hard cowhide strips on the edges to deal with it.
Diagnosis and exclusion of murmurs caused by fine-tuning:
1. Diagnosis method of noise caused by fine-tuning: use a thin wooden stick with softer wood or simply use your fingers to poke and dial each part of the fine-tuning while plucking the strings with your fingers or pulling hard on the top wall to see the noise. Can it disappear visibly.
2. The type of noise caused by fine-tuning:
① Fine-tuning itself is a quality problem. For example, the fulcrum rivet of the L-shaped trip string hook is too loose, causing the cross arm of the L-shaped trip string hook to collide with the two walls of the embedded groove to generate noise.
② The fixed nut of the fine adjustment is not tightened, and it is loose from the chord plate. Some tailpieces have grooves for fine-tuning, but the fine-tuning is not inserted into the grooves, which leads to unstable installation and noise.
③ The lower end of the inner and outer gong wire pipes is too long to be unscrewed from the tip of the fine-tuning T-shaped adjusting screw, and the horizontal arm of the L-shaped string hook touches the violin panel and produces noise.
④ The tip of the fine-tuning T-shaped adjusting screw is not screwed out of the lower end of the inner and outer gong wire tubes, so that the cross arm of the L-shaped tripping hook touches the inner and outer gong wire tubes and produces noise.
⑤ The inner and outer gongs are too long, causing the L-shaped string hook to touch the violin panel and produce noise.
3. Elimination method of noise caused by fine-tuning:
For the first type, you can place the fine-tuned fulcrum rivet on the iron block and tap it lightly with an iron hammer. But don't knock too hard.
Types ②, ③, ④ can be re-installed and adjusted.
For the ⑤ type, the fine adjustment must be removed, and the inner and outer gong-grained silk pipes must be shortened.
Diagnosis and exclusion of murmurs caused by tailpiece and chin rest:
1. Diagnosis method of noise caused by pulling the tailpiece and chin rest: turn the violin over, put the belly of the violin against the wall padded with the towel, and the head of the violin against the chest. Press down and pull up, and then pull the tailpiece from the top, left and right directions, and then pinch the tailpiece upward with your left finger to see if the noise disappears.
2. The type of noise caused by pulling the tailpiece and chin rest:
①The semi-cylindrical at the lower end of the chord plate is offset in the arched hole of the chin rest, and the contact with the chin rest produces noise.
②Because the beef tendon is too thin, or the wood block like the nut is too low, the half cylinder at the lower end of the tailpiece touches the piano board and produces noise.
③The knot of the tendon line under the tailpiece is too large or the end of the line is facing down, and it touches the top of the violin and produces noise.
④Some violins (basically second-hand pianos or low-grade practice pianos) use thin wire ropes covered with plastic tubes instead of beef tendon lines, and the two metal chucks perforated under the tailpieces of the wire ropes are also the reason for the noise.
⑤ The door-shaped hook of the chin rest is not adjusted tightly, or the cork piece on the pad falls off, resulting in noise between the chin rest and the piano board.
3. The method of eliminating the noise caused by pulling the tailpiece and the chin rest:
Types ①, ②, ③, and ⑤ can be adjusted or sorted out. If necessary, a sponge can be filled to eliminate noise.
The fourth type, it is best to replace it with beef tendon thread. In addition to the above five aspects, the strings are also an important factor that produces noise, such as the falling of the strings, the loose or broken outer layer of the strings, and so on. The cello also has the problem that the pillars (foots) are severely loosened over the board and the wood, causing the mahogany or metal pillars to deflect, and when they are pulled out a little, they touch the top or backboard (often the backboard) and produce noise.
Diagnosis and exclusion of fingerboard murmurs:
The fingerboard should be tightly glued to the neck. The fretboard surface must be flat and parallel to the strings at a fixed distance, which is determined by the feel of the finger when playing.
1. Diagnosis method of noise caused by the fingerboard: Check whether the fingerboard is tightly glued to the neck, and check the strings to see if the fingerboard is flat and parallel to the strings at a fixed distance, and then on each string, automatically The nut starts to press the fingers one by one, press the bow to play, and listen to whether there is any accidental string noise.
2. The type of noise caused by the fingerboard:
①. The fingerboard and the neck are not glued tightly, and there is a gap, resulting in noise. Very weak, generally not easy to detect, unless the fingerboard material is poor and easy to vibrate.
②. The surface of the fingerboard is deformed, uneven, and cannot be kept parallel to the strings, and the local arches are in contact with the strings. Or although the arch is not high, the strings are not touched when the bow is pressed lightly, but when the bow is played with heavy pressure, the strings are touched and noises are generated.
3. The surface of the fingerboard is flat and not deformed, but the side close to the bridge is high, and the side close to the nut is low, so that after the upper sound is pressed, the lower sound touches the strings and produces noise.
3. The method of eliminating the noise caused by the fingerboard:
The first type, if the degumming is serious and the gap is large, simply use an old-fashioned eagle beard blade to cut through the gap between the neck and the fingerboard, remove the fingerboard and re-gluing; if the degumming is slight, the gap is not large or only partial , don't remove it forcibly, drop the glue, and immediately clamp it with a bench vise that has been wrapped with a towel on the jaws.
For the second type, it is best to change the fingerboard. If it is difficult to remove, under the premise of taking protective measures for the violin, smooth the fingerboard with a wood rasp and apply new paint.
The third type can be easily solved by adjusting the height of the bridge.