“foot wrap“ technique
of I consider it necessary also to note that in discussing this issue, I greatly improve my knowledge in this area. For example, I did not know what hole splitting in a pin block
reamed for not chopping axes, and at an angle of about 8 degrees up from her that initially, until the seat is not worn out, due to the expansion of forces acting on the pin, there is some (admittedly minor) force, which “drown“ it and improves its functional qualities. According to numerous comments and links I`ve learned a lot of material for the manufacture and operation of the piano, which made it possible to abandon some of their beliefs and reasoning, which I took as an axiom is not fully owning the necessary theoretical knowledge and practical skills, for which he is grateful for their opponents.
of In short, since all materials are described in some detail at the forum will explain the issue. When the softening mounting place where the friction forces is not enough to provide the necessary tension of the string, according to classical technology seeks to restore a pin block
if the same and it does not provide normal operation chopping, then replacing mounting place
on a larger diameter of pin, or a conclusion about the impossibility of restoring tool.
of No disputing the effectiveness of this method, according to the literature, it is used by all professional Adjusters as the primary and, therefore, his denial of all classified as unprofessional and dilettantism, I allowed myself (certainly not from the “good life“, and only because of the poor state of aging and mass - service fleet of tools in the area), TR to find an alternative solution.
of Having carefully considered the design of pins of different producers, I said that the working part mounting place, which provides reliable fixing in his seat, is nothing but a cobweb thread, not just annular notch. Thus, peg can be, with some approximation, of course, be regarded as a classic bolt. And that can happen with a threaded connection, if the bolt is not screwed into the nut, which has much lower strength of the material, but just to hammer it. The answer is obvious, all probably encountered instances in which the hinge unit cover fixing the piano, not fastened with screws, as it should, and vocational students were killed the then tool factories, such as nails, which is much faster and practically at the beginning is not visually noticeable.
of Above my theoretical justification, of course not certain. Judging by the available technical literature, numerous references to which I have been graciously submitted by visitors forum and certainly by professionals, this is not quite as easy as I expected. For example, the well - known publication a pin block in a series of “master library of consumer services“, published in the middle of last century, categorically states that if a mechanized Mounting friction torque can be greatly reduced if the splitting set rotation, so this method should be excluded from production practice, especially from the practice of repair. No way diminishing the importance of this fundamental hitherto edition, it is theoretically difficult to agree with this conclusion, as screwing and fitting score, you see, not one and the same turns of thread, albeit a minor adjustment, with mounting (or finishing) increase diameter of the seat made of less durable material and removed material a pin block entering into engagement with the turns carving, cut precisely to increase the area of contact material a pin block with pins and, consequently, increasing the force of friction. Nevertheless, not having the necessary laboratory facilities, allowing to produce the necessary studies and experiments, nothing can assert unequivocally. One can suppose that slicing numerous turns into a wooden base a pin block, his stuff a few undergrind with each of the numerous revolutions (over 100 on one pin) and the coefficient of friction of this decrease, respectively, and decreases the moment of resistance reversing chopping of the current strength of the string tension, but it I repeat, purely theoretical assumption, and I doubt that the authors of the above - mentioned publications have made their conclusions based on some kind of massive research and not purely theoretical. Well, that at the time of mass use of his method of disaster recovery chopping “restorable“ tools, I did not know about the above publication, otherwise, obviously, would have thought, and many pianos in the area would have either a landfill or contain “better times“ by the principle of “suitcase without a handle, inconvenient to carry and throw a pity.
of Perhaps, if continued, “old and good times“ when in each apartment stood a piano, all of which sought to acquire a new, intensely worked all the factories for the production of a piano, classical and massively used method of finishing in a pin block mounting place was acquitted. Two or three normal the tuning, then go talk about the repairs, then Non - Repair piano at all, or that it is much cheaper to purchase a new instrument. Because of the mass execution of works, large employment and, most importantly, great demand for tuners, of course, such a simplistic, often quite effective and, most importantly, productive process of hammering pegs hammered (with various devices, tips and tricks, etc.) are not could be questioned and no one ever thought otherwise.
of I suppose that in some regions of the former elite of the country in a state park tools radical changes did not happen. Professional musicians and had not “favored“ domestic pianos and grand pianos, as well as former and modern “know“, preferring foreign. Do not exclude that in Moscow, Leningrad, where the standard of living, even ordinary people on the orders above the province to reconsider the classical technique to ensure the reliability of landing and chopping is not necessary. But we have a very different situation to work with tools that, naturally, were made in Soviet times, quality of their manufacture is well known, have undergone several movements in the residence of the “new owners“, and the corresponding number of possible adjustments and repairs, to restore the classical ways efficiency of such a tool is practically impossible. Even a cursory glance at the Status of chopping, not touching the keys, you can determine which string is not built, as all the previously “finished off“ splitting, by the forces of tension of the strings, mournfully, “I bow my head,“ as if “words“ that that now is the expansion of the forces of boring at a certain angle SEAT for chopping, works in the opposite direction, ie, this force is no longer recessed pin on the contrary, it “pulls“. Often they are from those not in the least afraid of the word “barbaric“ practices, change its geometry and geometry of the location relative to the other, with them you cannot work the usual standard key, he simply “does not climb on the deformed a pin, there is no provision for the coils of the string when you configure etc. negative circumstances.
of Given the above, and sometimes being in a desperate situation, I began to experiment and, at first just changed the pin to pin with large diameter, when the seat has already been irrecoverably smashed the previous restoration and tuning work professionals are not very scrupulous, and began to TR to fill the gap between the pins is not valid and hole a pin block
different materials, and led me to this study of some methods and ways of restoring the threaded connections used in general engineering, and especially in aviation.
of The fact that aviation, in order to facilitate structural weight, often using different aluminum alloys. Corps aircraft engines are made of alloys, AL - 3 AL - 5, etc. And aggregates equipment engine is naturally attached to them on steel studs. By vibrations in the process of long - term operation, such a compound housing several pins with softening in the housing formed looseness and looseness of wood the compound loses its required strength. In order to eliminate such defects is widely used method of thickened heels that is, there are repairs pins with the same pitch but slightly larger diameter, and technology repairs engine designer specifies the maximum allowed (providing sufficient strength) diameter studs repair. But this method is widely known, for repairs restore functionality mounting place of piano also applies, nothing new here I am not “opened“, and another thing that quite often, SEAT is broken so that no repair pin increased diameter does not provide a normal connection, and specifically made, disparate diameter pin is already having an impact on neighboring compounds, softening them already.
of Interested me more, in some exceptional cases, for example, for one flight, ferrying aircraft to the base, the aviation technology uses a somewhat unusual way, namely “the way foot - cloth, hence the terminology that I use. The thread of the stud of the softening compound rewind lead thread, or, in some cases even lead foil. Connection with the hardened, which allows us to provide sufficient bond strength to the established TBO aeronautical engineering.
of In my search I have tried many different materials, including single - component and multi - component adhesives with different fillings. The most effective and durable (oddly enough) was a regular corrugated cardboard, which provides the necessary quality, and restoration takes place fairly quickly, with virtually no material costs and without the risk of “disorder“ of adjacent pins, which inevitably arises in the classic “finishing“ chopping. Depending on the compound, this material allows for multiple settings for a long time operation of the instrument. Currently under my control are dozens of tools, it is recovered by this method and with another setup issue with the restored mounting place of piano should never be, but because of the general and the poor state of the tool has only rewind more and more “foot wrap “is on the other splitting. Technology disaster recovery mounting place of piano is quite simple, I have repeatedly cited it in a variety of reports and articles, for the sake of completeness of the material will allow myself to describe it in this article.
1. Care should be taken to release “wrong sounding“ pin to weak rings of the string.
2. With the help of a thin but strong enough screwdriver (awl or specially made devices) to remove the end of the string of chopping.
3. Without removing the string completely unscrew the pin.
4. Embed seat a pin block strip of corrugated cardboard thickness of about 3 mm. and the size of 20x50 mm.
5. Fix the strip to the end seat.
6. Insert pin into the housing and screwing him, doing the necessary and sufficient effort, trying to screw him strictly on the axis, procedure should be divided into 2 - 3 stages, as the peg for screwing enough very hot.
7. Screw the pin to the original (“native“) to its position in a pin block
Gently and carefully, not making more effort to pass end of the string through the hole chopping, if necessary, however gently, to avoid possible breakage of the end of the string, doge its end to its original position in the hole splitting.
of Fixing and bringing the pin to the desired pitch, you need to push the rings of the string, so they do not “crawl“ and do not overlap each other, and arranged carefully and closely.
8. If you do not build twin peg, it is necessary to equalize the tension during the height of about two chopping sound of one string.
View the entire technology can be seen on the video footage me at:
of youtube. com/watch? v=CGk3dS6dKow &feature=channel
From the material it is evident that in a short period of time and very simple to restore the connection, which previously could not provide the necessary tension of the string.
of Of course, in terms of normal wizard, it looks primitive, if not just wild, but under current conditions the province simply and effectively solves the problem of life extension is almost Non - Repair tools and contributes to some extend the time period before the inevitable and massive shift in the average consumer electronics.