Teeslots are machined circumferentially in the periphery of the rotor front and rear halfcoupling flanges to permit the weights to be positioned and retained. Parts list and notes for making a 10 hp 240v single phase to. To learn a simple, practical method of dynamic balancing that can be used in the field and appreciate its. Firmly attach balancing weights of the required mass to the calculated positions on planes 1 and 2 of the rotor. The discussion in site and factory methods includes influence. Diy metal lathe machine without using a lathe machine. We chose to do a wheel balancer, mostly because it involves a fair number of topics, and because its cool how it works. The tm1002 is an experiment that looks at balancing a rotating mass system, statically and dynamically. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. The rotating assembly is then driven at a relatively low speed by belt or air, and imbalance readings are taken on both the yurbo compressor and turbine ends of the rotating assembly. Balancing a highspeed rotor on a balancing machine. Chra balancing consists of mounting an assembled turbo chra in a conventional two plane dynamic balancing machine. Soldering a method for making electrical connections between wires. The balancing of rotating bodies is important to avoid vibrations.
M1 10hp 17xx rpm 220240v 3ph motor t1 control transformer, use 4r390 or equivalent. On completion of this tutorial you should be able to do the following. A rigid rotor can be balanced at the two end planes and will stay in balance when in service. Vibrations are noisy and uncomfortable and when a car wheel is out of balance, the ride is quite unpleasant. Cnc routers the spindle is the heart of a high speed cnc router motor rpm, power, and torque characteristics spindle rotor critical speed behavior spindle rotor bearing type, orientation, and speed rating bearing lubrication and cooling provisions bearing design for plunge cutting thrust bearing contamination issues dust.
Rotating machinery rotor balancing the aim of rotor balancing is to achieve satisfactory running when installed on site. Accuracy of balancing balancing to the achievable limit is uneconomical specific unbalance e. Latham, new york prepared for lewis research center under contract nas318520. To start programming arduino first we need to download a firmware for balancing robot called balancingwii. Rotor balancing methods and instrumentation springerlink. Passive magnetic bearings use permanent magnet stators to repel a rotor with permanent magnets with opposing polarization 8. It means no more than an acceptable magnitude of vibration is caused by the unbalance remaining in the rotor. Rotor balancing with single plane 4runs method youtube. A balancing machine is a measuring tool used for balancing rotating machine parts such as rotors for electric motors. Mechanical parameters here are the buttons to select mode of displaying graphs obtained as results of simulation of unbalanced and balanced rotating body. Spindle rotor critical speed behavior spindle rotor bearing type, orientation, and speed rating bearing lubrication and cooling provisions bearing design for plunge cutting thrust bearing contamination issues dust provisions for thermal elongation of rotor tolerances on fit, concentricity, and balance. The correct application of this method ensures the operation of. The problem of balancing a flexible highspeed rotor on a bmseries balancing machine is addressed.
The purpose of balancing at running speed of the rotor is to reduce the greatest of these three components to a practical minimum. Dynamic balancing is more involved than meets the eye, but i dont see why an attachment couldnt be built. Now we can move towards the programming of self balancing robot. Soundcard based dynamic balancing machine for model gas turbine. Shop balancing methods the methods employed in shop balancing can have a profound impact on the resulting balance condition of the rotor. By use of trial weihts in the form of modeling clay the amount and point of unbalance. Pullpush trying to get any movement out of the rotor, there should be at most 316. Aug 05, 20 impeller dynamic balancing with balanset1.
Balancing machines types, classification, and methods. The two really have nothing to do with each other except for the fact that they affect ride and handling. Sep, 2019 diy self balancing robot electrical drawing above image is the circuit drawing of self balancing robot. Rotor and for the measurement of once per revolution vibratory forces or motions due to unbalance in the rotor. Static balancing of the cal poly wind turbine rotor derek simon the balancing of a wind turbine rotor is a crucial step affecting the machines performance, reliability, and safety, as it directly impacts the dynamic loads on the entire structure. These include smooth operation, access to optimal weight planes, and verification of the mechanical integrity of the rotor and any assembled components rotors are typically run to 110% overspeed.
We provide dynamic balancing services to people who have rotors, fans or impellers that need repairing. Balancing machines types, classification, and methods the goal of rotor balancing is to reduce unbalance enough such that it can operate properly once installed on site. One area of the rotating assembly which we have learned can be improved is the rotor itself. That is, flexible rotor balancing procedures take into account rotor flexibility, while rigid rotor balancing procedures do not. Static balancing is sometimes close enough, depending on application, but dynamic balancing is vastly superior. I have prepare a pcb also you can download the gerber file to order pcb or you can also edit the pcb in easyeda platform. A balancing report is issued and stored as a reference in our database, along with the serial number of the turbocharger.
Solid mechanics balancing tutorial balancing of rotating bodies this work covers elements of the syllabus for the edexcel module 21722p hncd mechanical principles outcome 4. Youll have to wrangle something similar on your own to attach the board to the m8 threaded rod that serves as an axis. Highspeed balancing hsb of generator and turbine rotors offers a number of advantages. A rotor can be balanced either statically or dynamically. The purpose of this tutorial is to describe details related to shop and field balancing of turbomachinery. Overhung configuration rotor wt 100lb 50lb 50lb rotor wt 100lb 80% 20%. Balancing the rotor to support the circuit board, we found an 8. Wheel alignment is often confused with wheel balancing. Ensure that the balancing weights are firmly attached to the rotor. In the case of a narrow wheel, balancing simply involves moving the center of gravity to the centre of rotation. Using a 6 pry bar, place the bar between the tooth and the housing. Balancing of a multimass flexible rotor without phase dyrobes. Static balancing of the cal poly wind turbine rotor.
For a system to be in complete balance both force and couple polygons. The rotor rebalancing is a procedure performed on just the rotor using a series of corrections and adjustments by removing material from certain areas of the rotor. In fact there is no reason why anyone, with enough mechanical aptitude to assemble an engine, cannot achieve good results. Rotate your rotor to where the outer most teeth are in the 12 oclock postion. Diy style guys, id like to find out different methods of rotating parts balancing that dont require any special balancing machinery.
Two force sensors, one per shaft support, measure the vibration forces created by the unbalanced wheel. Overview of dynamic balancing machines, specifications and prices. If a rotor is balanced on a low speed balancing machine assuming it is rigid and then in service becomes flexible, then unbalance, and thus high vibration, will be the result. For symmetri cal rotors the journal load is 50% of rotor weight. One thing about the pdf file, it instructs you to compensate for a heavier paddle by moving the flybar, but this imo is not technically the way to go as the cog will be off. Dynamic balancing of rotating machinery experiment technical. Hp turbine final balancing after overspeed test at 120% balancing plane rpm balancing weight gr. These generic titles refer to whether or not rotor flexibility is taken into account. This limit is established in general by the capabilities of shop balance machines. A balancing machine that provides for the support of a rigid rotor under nonrotating conditions and provides information on the amount and angle of the static unbalance. In fact there is no reason why anyone, with enough mechanical aptitude to assemble an engine, cannot achieve good results with some home grown balancing on certain types of engine. Rotor balancing article pdf available in shock and vibration 556. This measurement is not needed for balancing the rotor, but will be used later as a check on calculations.
A short course on wheel alignment valley buick gmc. Rotating machinery rotor balancing lifetime reliability. In the case of a flexible rotor, it also means that not more than an acceptable magnitude of deflection occurs in. Various balancing methods were studied in order to balance the rotor. Magnet rotors are the steel disks carrying the magnets past the stator. After balancing, the rotor can reach the better class than it was in before balancing. Rotor balancing methods may be separated into two categories. It is a serious safety risk if a balancing weight is not firmly attached and flies off while running the machine.
The balancing of rotating bodies is important to avoid vibration. Ny nasa contractor report 2975 balancing techniques for highspeed flexible rotors a. Place a trial weight at some location on the rotor, restart the machine, and record vibration amplitudet. If a wheel is out of balance, it will cause a vibration at highway speeds that can be felt in the steering wheel andor the seat. Reducing unbalance reduces vibration and increases efficiency and life of the rotor and bearings. Aug 07, 20 accuracy of balancing balancing to the achievable limit is uneconomical specific unbalance e. The aim of balancing is to reduce the amplitude of vibration to a tolerable level, which can be taken to be about 25 mi at the bearing pedestals. Value of e is in inverse proportion to the maximum working revolution speed n min1 of the rotor, which means that en is a constant value. M2 manual dynamic balancing machine balance systems. Balancing of the rotor is one of the most important crucial key elements of the gas. This is important since rotors can generally only be balanced using the rigid rotor method. The target machinery is api type turbomachinery such as steam turbines.
The above formulates the balancing problem for multiple weight additions, although no runout or noise is present in these equations. Analysis of balancing of unbalanced rotors and long shafts. Static balancing is sometimes close enough, depending on. In heavy industrial machines such as steam turbines and electric generators, vibration could cause catastrophic failure. A not so long time ago, in june of 20, three classmates and i began our senior year mechanical engineering project. Feb 15, 2008 one thing about the pdf file, it instructs you to compensate for a heavier paddle by moving the flybar, but this imo is not technically the way to go as the cog will be off. Mar 02, 2016 sounds like a viable project and one for thought. The system is naturally stable, tending toward the equilibrium in the center of the bearing. Dynamic balancing machines, models, specs and pricing. Soldering a method for making electrical connections between wires using a hot iron and coating everything with molten solder. Parts list and notes for making a 10 hp 240v single phase. The vibratory motion of either bearing may be represented by three components, the horizontal and vertical radial components and the axial component.
A method for lowspeed stepbystep balancing is proposed and implemented by the rotor manufacturer. In heavy industrial machines such as gas turbines and electric generators, vibration can cause catastrophic failure, as well as noise and discomfort. A flexible rotor will require multiplane balancing. If a rotor is balanced on a low speed balancing machine assuming it is rigid and then in service becomes flexible, then unbalance and thus high vibration, will be the result. Factory balancing the best start in life the balancing process itself is a skill that requires not only knowhow but a lot of experience as well.
719 490 897 1331 1407 569 91 1496 737 1360 948 1051 434 1425 1285 571 1318 1058 1125 813 651 1578 1181 246 825 671 524 454 494 177 211 189