Oscilloresis - electric mini-saw and multi-tool

    This is the weapon of the Jedi Knights. Not as awkward and inaccurate as a blaster. An elegant weapon of a more civilized era ...
    (Ben "Obi-Wan" Kenobi, a brief description of the blue Jedi sword, given here solely for the sake of a red word)

    Jedi IT oscillatorThe desire to invent or improve something for a man is as natural as having a relationship with a woman. At least I think this statement is true for the lion's share of the audience of a reputable portal. We do not saw as much as locksmiths, auto mechanics, builders and servants of the people do, but we do it very intellectually, because we have such a job. Almost like surgeons, only their responsibility is of a different order.

    When creating a computer chassis for “smart” furniture, I needed to somehow cut a thin aluminum profile, many times and sometimes in figures. And now I’m the fifth corner of the saw with such a small hand saw for metal, I quietly swear at myself and think: I’m not a monkey, I need to somehow solve the problem of automation of manual labor. Indeed, in addition to jigsaws and angle grinders (“grinders”), the market now abounds in circular, miter, saber and other types of saws of varying degrees of high cost and slaughter. But I do not provide services for the urgent replacement of heating batteries, it is generally impossible to cut with a grinder, and cutting small parts is also inconvenient. An accident with a “grinder” from a neighbor (about safety measures separately) does not leave his head. It was then that I remembered about a hand-held power tool with strange nozzles, similar to the one

    DISCLAIMER


    I ask the esteemed audience to abstract from the trademarks seen (or not seen) in the pictures. I don’t want to turn the publication into an advertisement of a specific manufacturer, it’s important for me to bring the principle of action along with advantages and disadvantages, and I have no doubt about the ability of a respected reader to make the right choice without my help.

    The second important point is corrosion as a consequence of metalworking. I recommend that you study the permissible and unacceptable metal contacts according to GOST 9.005-72, excerpts from which I put in a separate publication , providing a convenient color cheat sheet.

    Modus operandi oscillating instrument


    Instead of rotational energy, this unconvincing-looking contraption uses high-frequency pendulum oscillations (oscillations) with a small amplitude, literally several teeth of a saw. It seems that the tool was borrowed from surgeons who have to cut and saw in hard-to-reach places, while not hitting anything superfluous. Of course, the electrical wire is not a femoral artery, but power cables also require respect. Probably, it was for IT specialists that a hand tool was invented without a specific trade name, which is discussed here.

    Some sellers call it right, but vaguely: an oscillating instrument . Others are just an electric chisel . Someone prefers a sonorous renovator, by the name of one of the trade brands. You can meet the term "multitool", which, however, is overloaded from a hand folding tool. For surgeons, this is a sagittal saw *, doctors cannot do without their Latin ciphers. I decided for myself to use a simple and capacious: oscillator , or pendulum oscillator .

    * Sagittal saw?
    Dedicated to all fans of Dr. Hannibal Lecter.
    sagittal sawI assume that the name comes from the anatomical "sagittal section", vertically dividing the human body into left and right halves. Doctors, don’t laugh, better tell me how you really are. And at the same time, explain whether the surgical sagittal saw is of a circular type, and not oscillating.

    The picture is literally from the first site that came across, here is the description:
    Designed for surgical operations on human joints. Contains a non-contact magnetomotor-type micromotor, a mechanism for converting the rotor's rotational motion into reciprocating-oscillating saw movement, and an electronic control unit. There is a mechanism for adjusting the spatial position of the saw in two planes. Power Consumption 20 VA; Saw oscillation frequency 0 ... 300 Hz; The amplitude of oscillation of the saw ± 2.5 degrees.

    UPD: By the way, doctors joined the discussion, and didn’t even laugh at all. Moreover, they even admitted to using household oscilloscope (from the household) for medical tasks that do not require surgical hygiene. Why not?


    UPD: History of the invention
    As the author of the publication suggested, the first IFI, he is also a "renovator", he is also an oscillating instrument, etc. invented for medical purposes in the company Fein in 1967. Thanks to pbw for comment and links (both positive and tragic), as well as UFO for cosmetic changes.


    In the photo: a group of surgeons is going to remove a circular (i.e., a continuous circular) plaster bandage from a boy’s recovered leg with an oscillating tool. There were no semicircular sawing tips for oscilloresis, so at first it seems as if they are going to amputate the leg together with gypsum. This is not so, the oscillator has a “magical” property of cutting hard gypsum (or bone) without injuring * soft * tissues. However, if the fabric under the gypsum is not soft and pink, but dry and peeling, then you will have to get scratches, the user Loki3000 shared this experience ). But first things first.

    About Fein
    The company has existed for more than 140 years and has invented many well-known power tools. Now it produces mainly industrial tools, and in the "household" sector it is perhaps the best, but also the most expensive brand. The oscillating instrument “Fein” was produced for medical workers: sagittal saws for working with the bones of the skull, saws for other bones, and for removing plaster. See also cranioplasty . User Ariez noted the successful use of an oscillating instrument in orthopedics, for example, in operations on knee joints. When using a submersible nozzle, the ratio of the cutting width to its depth is much more advantageous for an oscillatory saw than for a circular saw. Although no one canceled the chisels and rasps, Ariez notes .

    After the patent for an oscillating instrument ended in 2008, it was able to produce all those who are not lazy .

    Immediately make a reservation: no miracles. The interviewed experts generally dislike the oscillating tool because of its low productivity (the survey involved the chief engineer of the construction company’s projects and the owner of a small furniture business). Oscilloresis is an easy option for the home workshop and eliminating small jambs with a multitude of interchangeable nozzles.

    Nozzles


    DISCLAIMER: when buying, carefully check for what material this or that nozzle is intended, consult with the seller.

    Submersible saw (rectangular)
    It has the shape of a rectangle with a width of 1..3cm. If the nozzle rotated 360 °, then the saw side would form respectively. chord 1..3cm in an imaginary circle. But this thing sways by about 3 °, so we roughly believe that the saw teeth go along the chord. If you cut even a tree with immersion strictly normal, then at a depth of half a centimeter the nozzle can become blocked in the cut. In this position, all the vibrational energy is returned to the operator’s body, and as a result, only his nervous system is sawed instead of the wall. Therefore, if you need a mini-well, you should do it at an angle, going deep into the variable tacks , so that on both sides of the "pendulum" there is always an empty space of two or three vibration amplitudes. This is not difficult, but requires practice, or the use of a semicircular (sector) nozzle.

    The rectangular nozzle is good for sawing off small parts that interfere with installation: protruding parts of door frames, poorly screwed screws, out of place plastic pipes, or skirting boards directly on the wall. It is especially good where there is a risk of accidentally cutting off the entire door jamb with a piece of wall.

    Saw semicircular, à la grinder
    It has the shape of a wide-angle sector and is perhaps the closest approximation of the saw blade of a circular saw angle grinder , it just does not fly apart when destroyed, and it is unlikely to collapse. It copes with most tasks well and therefore wears out faster than other nozzles. When deepening into a part, it is not blocked in the same way as a “submersible” (rectangular) nozzle.

    Triangular sanding pad
    Why do you need triangular plates? Like on round ones, an emery cloth with the right grain is attached here, but the triangle will allow you to get to the very top of the corner, where traditional circular, belt or eccentric grinders will not get.

    Semicircular diamond

    The same as a semicircular saw, only with diamond tungsten carbide edge for scraping the tiles (removing grout).

    Diamond triangular
    The combination of a triangular shape and diamond tungsten carbide spraying for the treatment of hard-to-reach spots of cement, ceramic tiles, sludge, etc.

    Tearing off
    It resembles a rectangular (submersible) saw tip in shape, only massive, with one longitudinal wedge instead of transverse teeth. If you want to tear off something urgently, an oscillating scraper can significantly speed up the solution of this problem. However, if you want to tear off all the linoleum in the school gym, it will still be a long time, the instrument of the amateur class will overheat.

    Dust extraction option
    Some tools have a removable nozzle for connecting a vacuum cleaner. You and your family members do not have to inhale repair by-products.

    UPD:
    Nozzles B *** h
    Gazirov user in his comment gave a link to accessories for multi-cutter of a well-known manufacturer, there are interesting

    If one of the respected readers used an oscillating tool, you can participate in this publication, here are the options:

    • Describe the experience of using the nozzle that I did not indicate; photo nozzles are very desirable
    • come up with your own oscillator tool tip
    • look at the advantages and disadvantages of oscilloscope, which I cited below, add

    In addition to the gratitude of other readers, the most creative residents of the portal, I personally will thank with karmic points. But only once in a lifetime, more UFOs do not order.

    pros


    1. Speeding up small but tedious manual operations (automation)
    2. Cutting, grinding in hard to reach places (special functions)
    3. Oscillating wedge-chisel (special functions)
    4. Turning nozzles under the left or right hand, from any angle (special functions)
    5. Lightness, one-handed operation (convenience)
    6. The one and only tool with a wide selection of nozzles, including special grinding and sawing (low cost of ownership)
    7. There is no risk of being hit by fragments of an “exploded” saw blade (safety)
    8. UPD: There is no risk of getting a “Bulgarian kiss” (safety +) - cosma , NoRegrets , littorio , pbw
    9. UPD: There is no risk of cutting soft tissue even with a working nozzle (safety +) - RedSnowman , Gazirov , special thanks to Ariez for the pictures
    10. Flat edges of holes (engineering aesthetics)
    11. Cutting “blind” holes in pockets of a polygonal shape (special functions)
    12. UPD: Less dirt, no fountains of sawdust (home comfort, safety) - usego
    13. UPD: When cutting soft metals such as aluminum and copper, the metal does not “press” onto the teeth of the saw nozzle (processing non-ferrous metals) - video sent by Barafu
    14. UPD: Processing fiberglass and carbon fiber: composite does not chip and does not burn, cuts quickly (special functions) - romanpro

    Minuses


    1. Low cutting speed relative to the "grinder" (productivity)
    2. Vibration of the workpiece, incompatible with most electronic equipment; assembly-disassembly of the device is required (performance)
    3. Hole Depth Limit (Oscillator Limit)
    4. UPD: Some models are quite noisy (home comfort) - littorio , androude

    Safety precautions


    I’m neither a builder nor a car mechanic; I don’t keep my “grinder” at home. In general, I don’t really trust, categorically I don’t trust sawing with an angle grinder . Yes, who does not know, the “grinder” is intended for grinding, and cutting (not sawing!) Is its side property. Why - read the instructions for angle grinders, spoilers and comments. Cutting discs are available for angle grinders, and saw blades are designed for circular saws. You can dispute this postulate, but then you have to dispute the laws of Natural Selection at the same time ...

    UPD: Dear colleagues in the IT workshop, modders of cases and all the rest!

    The task of a very hard drive
    Here is a physics problem for you. Given: a very high-speed hard drive, the diameter of a single pancake is 6 ", weight is 300 g, power consumption is 1 kW. It is required to calculate the energy transferred to the" drive "case when the pancake instantly slows down from 11000 rpm to almost zero. That is, a sharp plate with a mass of 300 g consumed 1 kW of power and made almost 200 revolutions * per second *. And then it suddenly stopped, transferring a significant part of the kinetic energy of rotation to an iron iron. Then an iron mass of 2 kg (with a still rotating blade) jumps directly to the unsuccessful operator, trying to make him sa ittalnoe * section only without anesthesia and even without the presence of doctors. Tom would let go early so dead scared primate grip does not give ...

    Do you have the grip of the Terminator, or at least the harsh Siberian lumberjack? Then of course, take the grinder. I described a rather probable physical and mechanical alignment in a situation with a jammed disk. Jamming * is very likely * even with small deviations from the optimum cutting angle, especially if we work in hard to reach places. The colleagues in the comments described everything in sufficient detail, listing the cut off parts of the body. I even went to the forums via the links, read. There are even those who survived the kiss of the Bulgarian and wrote about it, but there are very few of them.

    * What is a sagittal section, see one of the spoilers above.

    UPD:
    In the comments gave a link to special trident saw blades, which, they say, can be used on angle grinders. But I would not :)

    Safety precautions when working with angle grinders and similar tools: when working, always hold on to the protective cover, preferably outside the plane of rotation. Insert the tool into the part as shown by the instructions for a particular device, do not look at other pictures! Believe me, a jet of sawdust in the face is better than an ax doing 200 rpm! Read the instructions, find out how to avoid both of them. Watch the speed, do not overheat the disk, cut strictly under 90 °, destruction or jamming of the disk is deadly .

    I apologize to experienced builders and experienced Jedi, but I want to draw the attention of the intellectual elite to the quite logical, but not quite expected kinetics. With a jammed disk, the “Bulgarian” jumps in the plane of rotation, but the most probable direction of the “throw” (recoil) is opposite to the stream of sparks and sawdust flying from under the disk. This, probably, explains such a frequent and fatal injury: an unprepared operator tries to get away from a sheaf of sparks, substituting a head with a neck for a chopping blow with a power of the order of 1 kW. When working with the “grinder”, there are not enough * goggles * *, you need a mask for the whole face, a hat and clothes made of thick and durable material, especially in the area of ​​the head and neck. And in the summer too: it's better to sweat for half an hour than to lie in the refrigerator later. The easiest way, by the way, is for owners of two-wheeled vehicles - they already have almost all the equipment

    Reciprocating saw is a great alternative for cutting and sawing.

    About the angle grinder accident
    I had a neighbor who, with a tiny grinder, cut a huge steel sheet 5mm thick, and one summer evening he was gone. Neighbor, I mean. The unfinished sheet then lay throughout the whole of autumn and winter with a rusty monument, until a silent janitor took it away in the direction of the metal receiving point. And while the steel was rusting, the residents of the house smoking on the balcony examined the deep and uneven cuts on the sheet, visible from under the snow. Involuntarily think about the transience of all worldly ...

    So, the oscilloscope has no rapidly rotating parts, it has nothing to explode and maim. Moreover, the representatives of medicine confirmed in the comments that with a sufficiently low amplitude of vibrations it is possible to push a working tool into its own flesh without fear of cutting ... No, no, I meant removing the “circular” plaster casts from the limbs, and not what some thought readers.

    But the circular saw does not forgive mistakes, either a real Jedi locksmith or an idiot can stick his fingers under the casing. Fans of sawing “grinder” (angle grinder) argue with Natural Selection, and this is too strong a player, I would not even play ordinary roulette with him.

    First impressions


    And so, I finally take the oscilloscope in the manner of a Jedi sword, turn it on and belligerently swing at the aluminum corner clamped in a vice. I start to saw with a semicircular nozzle. The whole part trembles, but not from fear, but from vibrations, together with a vise and a table. And while I am drinking, all the nearby contents of the table come to life and dance: light trash leads round dances around more massive scraps; hardware sneak to the edge of the table with the clear intention of falling to the floor and violating all conservation laws by bouncing to the farthest corner; without leaving the case, a couple of files join them slowly. And here the hammer reached out there, clearly aiming to fall on my foot.

    All this vibroshows are distracting. We remove from the table everything that is not fixed, especially heavy and sharp. It may be worthwhile to remove the expensive mechanical watch from your hand. Sawing a PC case with hard drives with an oscillating tool is undesirable, especially when it is turned on. Why are there spindle disks, the civilian “iron” in principle does not like vibration, this is not industrial electronics for a drilling station.

    Metal
    Hmm, this is significantly slower than the “grinder”, but much better than the nail file I started with. A comfortable limit lies somewhere in the area of ​​the M10 bolt from conventional “galvanizing”. In other words, a galvanized steel cylinder of the order of 10 mm can be sawed for a rather long time, but it is still possible, but 20 mm in several steps so that the tool can cool down. Sheet steel and aluminum profile are sawn well. Care must be taken to ensure that the nozzle does not block in the cut, it should not freeze motionless relative to the part. When sawing, take a closer look at the picture, there should be a blur effect at the edges of the nozzle: this means that the cutting part will oscillate relative to the part, and not the tool itself (together with the operator’s hand) relative to the nozzle.

    By the way, with refractory metals, in my opinion, an oscillating hand tool is useless: the vibration energy will simply be reflected from the part into the operator’s body, or it should be the grip of the Terminator and the corresponding power of the tool. But I myself have not tried it, if someone sawed a stainless steel with an oscilloscope or a safe of guaranteed burglar resistance, share your experience. Perhaps you need to remove a popular science program from the series “In Search of Superhumans,” or at least an action-packed detective story about you.

    Tree
    Once I went to my cousin in the country with a very ordinary mission: to drink and have a bite. And at the same time help with the veranda and establish the Internet. For carpentry, I took with me an oscilloscope. We were lucky, LTE was detected immediately from two operators with a difference of just some 20..30 ° in azimuth. And when it came to cutting holes for the microwave cable, I again drew the tool in the manner of a Jedi sword ... But there it was. Oscilloresis can theoretically go through the wooden wall of a country house, but then the entire instrument should go through the hole. The wall of the house is a rather thick sandwich of several layers of wood and insulation. Oscilloresis can cut a neat square hole in the upper layer of the "lining", and go through the deeper layers with a drill. To lay my microwave cable, a long drill bit on wood was much better

    Plastic
    It was necessary to cut a figured hole in the plastic cable channel Legrand DLP. Probably, a long time ago and in a distant galaxy, Eniken Skywalker was already experiencing similar sensations, cutting out * for * young ones a light-sword model of an imperial cruiser at a scale of 1: 1000, directly from a decommissioned starship. Like the refractory tungsten-titanium sheathing of a spaceship under the Jedi sword, the plastic is not given to the oscilloscope immediately, but a little later, melting a bit and giving thought to the bright side of the Force.

    Comparison with other tools


    Only a real Jedi can stop a clumsy grinder or drill drill on the edge. You can’t just take a deep detail with a “crown”. Large rectangular holes can be approximated by drilling in a row, but there will be ugly discretization of the edges. The jigsaw does not make blind holes at all, they must first be drilled.

    UPD
    It turns out that under certain conditions, a jigsaw can still make a blind pocket using a technique known as “plunge”: although it requires some spatial scope, it looks quite affordable. Thanks to Ezhyg and realraven users for their comments.
    jigsaw

    You do not need to drill the initial hole or make an introductory incision if you carefully follow these steps.
    1. Tilt the tool up at the front edge of the base with the blade directly above the surface of the workpiece. (see pic).
    2. Apply pressure to the tool so that the front edge of the base does not move when you turn on the tool, and carefully and slowly lower the back end of the tool.
    3. When the blade cuts through the workpiece, slowly lower the base of the tool down onto the surface of the workpiece.
    4. Complete the cut as usual.

    But if just one small, round hole is enough, you don’t have to show off, take a drill and drill it. Use pen or crown accessories of different diameters. Take the jigsaw. Simple edges and profiles can (carefully) be cut off with a grinder. There is, by the way, a reciprocating saw - a powerful, relatively safe tool for home and country work, two-handed and mini. It will all be much faster. Perhaps I would buy a “one-handed” saber mini-saw.

    UPD:
    Colleagues very often mention a mini-drill, known as "Dremel", also a kind of common name, derived from a famous brand. The tool is good for small and jewelry work, but still it is more like an engraver drill than a locksmith's saw. However, see the comments of respected readers, especially in terms of choosing a specific manufacturer.

    Summary


    For me, oscilloscope is a great tool for IT engineers and home craftsmen. Not as awkward as a grinder. An elegant tool for the information age ...

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