6/29/2023 0 Comments Schenck trebel corporationThe latter being required when the rotor has a high service speed, or critical application (see ISO 201940 for recommended balancing tolerance.) With the machine setup a little bit more tedious, it is generally more suitable for high-production volume and high-precision balancing tasks. Thus use of dedicated fixture for each type of rotor may come at additional cost but offers the advantage of better balancing process accuracy and less dependent on the machine operator's skill level. With measuring equipment capable of storing the setup calibration parameters, the need for recalibration becomes unnecessary as long as the original rotor setup on the balancing machine at the time of its calibration is duplicated. The preparation of a soft-bearing machine for individual rotor types is more time consuming, because it needs to be calibrated for different part types which makes the process accuracy dependent on the operator's knowledge and skill. Therefore, it works very well for low- and middle-size volume production and in repair workshops.Ī soft-bearing machine is not so versatile with respect to amount of rotor weight to be balanced. Only five geometric dimensions need to be fed into the measuring unit and the machine is ready for use. A hard-bearing machine is generally more versatile and can handle pieces with greatly varying weights, because hard-bearing machines are measuring centrifugal forces and require only a one-time calibration. Both types of machines have various advantages and disadvantages. The suspension's displacement is dictated by the distance of the rotor's principal axis of inertia relative to the rotor's rotational axis defined by the rotor bearings. In a soft-bearing machine, balancing is done at a frequency higher than the resonance frequency of the suspension. Thus the suspension's resulting displacement is caused by the centrifugal force generated by the unbalance of the rotor. In a hard-bearing machine, balancing is done at a frequency lower than the resonance frequency of the suspension. The difference between them, however, is in the suspension and not the bearings. There are two main types of balancing machines, hard-bearing and soft-bearing. Along with phase information, the machine can determine how much and where to add or remove weights to balance the part. As the part is rotated, the vibration in the suspension is detected with sensors and that information is used to determine the amount of unbalance in the part. The unit under test is bolted to the platform and is rotated either with a belt-, air-, or end-drive. The machine usually consists of two rigid pedestals, with suspension and bearings on top supporting a mounting platform. Two balancing masses (denoted m) used to balance a non-concentric rotating mass.Ī balancing machine is a measuring tool used for balancing rotating machine parts such as rotors for electric motors, fans, turbines, disc brakes, disc drives, propellers and pumps.
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