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10 - 2

Grinding wheel balancer mode

Function access menu

The selection of the function shows to the operator a page where to select the following
options:

New program

Open project

Delete project

Use current program (available only if a program previously created has been
completed until the balancing correction is calculated)

New project

–

BALANCING SETUP

The creation of a new program requires the setting of some parameters, carried out in NEW
PROJECT SETUP window.



Setting the number of sliding weights on the grinding wheel

Choose from the following options:



no.2 weights



no.3 weights

Содержание N330

Страница 1: ...rgimento 9 23826 Mandello del Lario LC ITALY www cemb com N330 ROTORS BALANCER SINGLE AND DOUBLE PLANE PORTABLE VIBROMETER SPECTRUM ANALYZER USER MANUAL Rev 03 2021 EN Translation of the original inst...

Страница 2: ......

Страница 3: ...e control panel 2 1 ON OFF button 2 1 OK button 2 2 Function keys 2 2 Arrow keys 2 2 Tab key 2 2 Screen description 2 3 Chapter 3 Home screen menu Chapter 4 OVERALL vibrometer mode OVERALL Vibrometer...

Страница 4: ...7 1 Setting the type of machine to be analyzed 7 2 Setup CUSTOM SMART ANALYSIS 7 4 Setting the rotation speed detecting mode 7 5 Photocell 7 5 Manual entry 7 5 Auto detection 7 6 Detection of a SMART...

Страница 5: ...ence 10 5 Initial run spin with evenly spaced sliding weights 10 5 Test run spin with a known weight in known position 10 7 Correction run spin with sliding weights in balancing position 10 9 MENU fun...

Страница 6: ...2 Measure setup 13 3 Measurement unit 13 3 Unit mode 13 3 Frequency unit 13 4 Max frequency 13 4 Number of lines 13 4 High pass frequency 13 5 Number of averages 13 5 Device setup 13 6 Date Time 13 6...

Страница 7: ...on industrial machines ISO 10816 Appendix C Judgment criteria on machine tool spindles ISO 17243 Appendix D A rapid guide to interpreting a spectrum Appendix E Photocell for instruments Nx30 Appendix...

Страница 8: ...6 Index Empty page...

Страница 9: ...cessories in a special case It is advisable each time the instrument is used to place back it in its case in order to avoid risk of damage during transit Standard accessories DESCRIPTION No 1 accelero...

Страница 10: ...micro USB cable No 1 battery charger with multiplug adapters No 1 HEAVY DUTY carrying case No 1 USB key containing instruction manual in PDF format Quick Guide booklet with basic operations for use Q...

Страница 11: ...ble length 5 meters for accelerometer Extension cable length 10 meters for transducer photocell No 1 accelerometer transducer 100mV g additional No 1 connection cable length 2 meters for accelerometer...

Страница 12: ...r for photocell input YELLOW connector 4 connector for sensor input channel A BLUE connector 5 connector for sensor input channel B RED connector To connect the sensor or the photocell insert the conn...

Страница 13: ...GROUND SHIELDING Status LEDs The keypad panel includes a LED positioned between the display and the keyboard The operating principle is as follows LED COLOR LED STATUS DESCRIPTION ORANGE Slow flashing...

Страница 14: ...n The lithium battery is able to withstand the recharging discharging cycles even on a daily basis without problems but it could become damaged if allowed to be fully discharged For this reason it is...

Страница 15: ...nction ON OFF button Press this button to switch the instrument on hold it down for at least 3 seconds to switch it off then release the button Note After pressing the instrument is ready for use only...

Страница 16: ...the bottom of the display directly above these two buttons Arrow keys Allow to move within the items of the instrument main menu and the menu of each individual function Viewing an FFT chart they all...

Страница 17: ...sensitivity A Sensor sensitivity B 5 measurement channel displayed the symbols and recall the color of the displayed channel see 1 4 Connections 6 main screen content graphical representation of the...

Страница 18: ...2 4 General layout Empty page...

Страница 19: ...attery charge state as a normal menu it also proposes and allows selection of the available functionality namely ICON NAME DESCRIPTION VIBROMETER measurement of the overall value of vibration VIBROMET...

Страница 20: ...43 2 measurement of vibration velocity LTSC with frequency range 10 5000Hz measurements in mm s RMS measurement of vibration acceleration STSC with frequency range 2 10kHz measurements in m s2 CBA CEM...

Страница 21: ...ase of the synchronous vibration 1xRPM i e corresponding to the speed of rotation of the rotor The vibrometer mode is designed to make this type of measure OVERALL vibrometer measurement screen The me...

Страница 22: ...he sensor in use is shown in the upper right area of the display To change its value see 13 2 Sensor A Sensitivity Sensor B Sensitivity Note With measurement from channel B enabled see 13 1 Sensor set...

Страница 23: ...asurement see Function Save measure 14 1 Open measure Allows the opening of a certain measure previously acquired through the VIBROMETER mode and saved in a specific project see Function Open measure...

Страница 24: ...4 4 OVERALL vibrometer mode Empty page...

Страница 25: ...ement screen The measurement page supplies a series of information organized as shown in the figure 1 displayed measurement channel 2 1xRPM amplitude of the vibration 3 angular phase of the 1xRPM vibr...

Страница 26: ...t from channel B enabled see 13 1 Sensor setup the key changes the channel shown on the display switching from channel A to channel B and vice versa The displayed channel can be identified by the symb...

Страница 27: ...surement see Function Save measure 14 1 Open measure Allows the opening of a certain measure previously acquired through the VIBROMETER mode and saved in a specific project see Function Open measure 1...

Страница 28: ...5 4 1xRPM vibrometer mode Empty page...

Страница 29: ...of very significant information its interpretation requires a certain amount of experience and attention for this purpose the material given in Appendix D A rapid guide to interpreting a spectrum coul...

Страница 30: ...sing the MEASURE SETUP function see Measure setup 13 3 freely modifiable using the specific function or the command menu Note The sensitivity set for the sensor in use is shown in the upper right area...

Страница 31: ...zooming one or both axes stopping the measurement automatically causes the AUTOSCALE of the graph Note After managing the X Y axes by zooming by accessing the MENU of the function pressing the key an...

Страница 32: ...Pressing the key activates the HARMONIC CURSORS mode the graph shows all the harmonics of the upper order 2nd 3rd 4th up to 50th of the highlighted peak The keys and which determines the movement of t...

Страница 33: ...MENU by pressing Select the item PEAK LIST confirming by Save measure Allows the data saving in a determined project of the detected measurement see Function Save measure 14 1 Open measure Allows the...

Страница 34: ...6 6 FFT mode Fast Fourier Transform Empty page...

Страница 35: ...nd an indication of the main causes that determine the vibration detected Caution The measure is limited within the frequency range 10 1000 Hz It follows that on the operating side can be evaluated ma...

Страница 36: ...g on the instrument a setup procedure is accessed STEP 1 setting of the type industrial machine and its installed power Select from the following possibilities SMALL MACHINE POWER 15 Kw INDUSTRIAL MAC...

Страница 37: ...tup is set only when the function is first accessed By exiting and accessing it again the previously setup is retained To change it refer to the CHANGING MACHINE SETTINGS item available in the functio...

Страница 38: ...key Note This setup is set only when the function is first accessed By exiting and accessing it again the previously setup is retained To change it refer to the CHANGING MACHINE SETTINGS item availab...

Страница 39: ...quested Select from the following possibilities PHOTOCELL MANUAL ENTRY AUTO DETECTION Photocell The rotation speed is acquired through the use of the photocell sensor Note The use of the photocell nee...

Страница 40: ...the machine under analysis Auto detection The rotation speed data is acquired by the user s choice of one of the dominant peaks available in the frequency spectrum Choosing this speed detection method...

Страница 41: ...nction MENU Note As for the other instrument measure functions only and only at the first detection of this type after switching on the instrument an alarm reminds to connect the sensors before making...

Страница 42: ...d through the SMART ANALYSIS mode and saved in a specific project see Function Open measure 14 3 Change machine setup Allows to modify the setup of the machine under analysis see Function Setting the...

Страница 43: ...Hz STSC Short Term Spindle Condition detection of the acceleration of vibration in m s RMS frequency range 2 000 10 000 Hz With the numerical values indicating the amplitudes of vibration the functio...

Страница 44: ...key At the first access to the function after switching on the instrument a setup procedure is accessed STEP 1 setting of the spindle type Select from the following possibilities SPINDLE WITH INTEGRAL...

Страница 45: ...speed detection mode Select from the following possibilities PHOTOCELL MANUAL ENTRY AUTO DETECTION Photocell The rotation speed is acquired through the use of the photocell sensor Note The use of the...

Страница 46: ...eed by consulting the plate data or the operating manual of the machine under analysis Auto detection The rotation speed data is acquired by the user s choice of one of the dominant peaks available in...

Страница 47: ...urn to the previous step with BACK Detection of a SPINDLE ANALYSIS measure After the setups shown on the previous pages or after having accessed the function again press to start the measurement the i...

Страница 48: ...easurement from channel B enabled see 13 2 Sensor B the key changes the channel shown on the display switching from channel A to channel B and vice versa The displayed channel can be identified by the...

Страница 49: ...ure 14 1 Open measure Allows the opening of a certain measure previously acquired through the SMART ANALYSIS mode and saved in a specific project see Function Open measure 14 3 Change spindle setup Al...

Страница 50: ...8 8 SPINDLE ANALYSIS mode Empty page...

Страница 51: ...alue for evaluation of bearing condition because it depend on many factors bearing support dimension rotation speed power and load condition etc Note The correct way is to monitor the value during tim...

Страница 52: ...nt of a CBA value Select the CBA mode from the main page of the instrument by pressing the key At the first access to the function after switching on the instrument if no measurement has been performe...

Страница 53: ...symbol placed in the upper left corner of the display see 2 3 Screen description Caution In the case of sensor not connected to the acquisition channel an error message on the display warns the opera...

Страница 54: ...of interest using the keys or modify the parameter using the keys or Use the arrow keys to type the numerical value every single digit must be confirmed by pressing the key The key DONE confirms the s...

Страница 55: ...tionalities are available here Save measure Allows the data saving in a determined project of the detected measurement see Function Save measure 14 1 Open measure Allows the opening of a certain measu...

Страница 56: ...9 6 CBA mode Activate custom limits Back to CEMB default limits Allows to activate deactivate custom limits for the evaluation of the severity of the measured value see CEMB limits custom limits 9 3...

Страница 57: ...as close as possible to the support bearing of the grinding wheel to be balanced using the magnetic base or fixing with a threaded hole to obtain good repeatability apply a reflective marker on the ro...

Страница 58: ...ect 4 Use current program available only if a program previously created has been completed until the balancing correction is calculated New project BALANCING SETUP The creation of a new program requi...

Страница 59: ...and Confirm each setup step using the key Back to the previous step with BACK Open project Allows to view the balancing projects saved in the instrument On the screen choose the project using the keys...

Страница 60: ...Take screenshot 14 4 Delete project Allows to individually delete the balancing projects saved in the instrument On the screen choose the project to be deleted using the keys or The key BACK backs to...

Страница 61: ...f 1 Initial run spin with evenly spaced sliding weights 2 Test run spin with a known weight in known position 3 Correction run spin with sliding weights in balancing position After setting the setup i...

Страница 62: ...Move the sliding weights as required at the first startup of the instrument if no measurement of this type has been performed yet a warning message reminds to connect the sensors before making the me...

Страница 63: ...for example a collision the time needed to make it rise could be too long to speed it up it is advisable to stop and restart the measurement by pressing the key Caution The average speed value is very...

Страница 64: ...uired press NEXT to continue with the procedure The key BACK backs to the previous step launch with evenly spaced sliding weights Note Use the key NEXT to go to the next vibration acquisition screen I...

Страница 65: ...this condition is left to the operator Correction run spin with sliding weights in balancing position After to be done the launch with weight B moved to known position see 10 7 Test run spin with a k...

Страница 66: ...procedure to follow Note From this point going back to the instrument home page and accessing again to the function will be available the item Use current project see 10 5 Use current project Press N...

Страница 67: ...lancing procedure FINAL REPORT On the other hand if the vibration value is NOT good press REFINE to refine the position of the sliding weights Move the sliding weights as required press NEXT to go to...

Страница 68: ...nd unbalance preceding and following the balancing procedure 1 Project name shown only when the project is saved 2 Initial synchronous vibration before balancing procedure 3 Final synchronous vibratio...

Страница 69: ...e letter composing the name must be selected by moving with the arrow keys on the alphanumeric keypad visible on the display and confirming the selection by pressing Press key DONE to confirm the proj...

Страница 70: ...10 14 Grinding wheel balancer mode Take Screenshot Allows to capture the image on the display by saving it as a png file see Take screenshot function 14 4 Press to continue...

Страница 71: ...o perform correct balancing are as follows place the sensors as close as possible to the supports of the rotor to be balanced by using the magnetic base or by fastening via a tapped hole to ensure goo...

Страница 72: ...dates Note If it is required to use data and parameters of a previously stored program it is essential to mount the transducer in exactly the same position on the rotor Selection of the balancing proj...

Страница 73: ...otor settings Optional setting If enabled entering the impeller data relating to its MASS Kgs to the correction RADIUS mm relative to the balancing weight to the desired BALANCING GRADE QUALITY G and...

Страница 74: ...as a current program Only at the time of a possible backup in the archive the operator is asked to enter a specific name which from then on will characterize it Open project Allows to view the balanci...

Страница 75: ...ent On the screen choose the project to be deleted using the keys or The key BACK backs to the main menu of the balancing mode while the key DELETE deletes the selected project By pressing key DELETE...

Страница 76: ...of a shaft is generally a procedure consisting of several steps In particular it consists of o Calibration for single plane balancing 1 first run without test weight 2 second run with test weight on...

Страница 77: ...es whose quality fails to reach acceptable levels In these conditions it is advisable to stop the measurement with pressing and consequently repeat the procedure by pressing again Note If the quality...

Страница 78: ...e choices using the keys and Enter the values to be set every single number must be selected by moving with the arrows keys inside the numeric keypad visible on the display confirming the choice by pr...

Страница 79: ...test weight setup Press to start vibration measurement as per the previous step is displayed a bar that shows the quality of the measurement in real time single plane balancing dual plane balancing te...

Страница 80: ...red If it meets the above conditions the TEST MASS OK item will appear otherwise TEST WEIGHT NOT OK Press BACK go back to the test weight setting screen press NEXT to go to the next page see 11 11 Cor...

Страница 81: ...ect BALANCING SETUP the ROTOR SETTINGS function has been enabled the screen shows whether the residual unbalance amplitude is within tolerance or not with respect to ISO 21940 11 Press HOME to go back...

Страница 82: ...ng After the run is acquired press BACK to go back to the previous unbalance correction screen press NEXT to show the new correction weight processed with the last correction run Note It is possible t...

Страница 83: ...red name for the project each single letter composing the name must be selected by moving with the arrow keys on the alphanumeric keypad visible on the display and confirming the selection by pressing...

Страница 84: ...he gap between two blades where obviously it is not possible to add or remove material However it is often the case also for uniform rotors to prefer to correct where holes are already present or else...

Страница 85: ...art convex 180 and the other concave 180 In order to carry out the splitting angles 1 and 2 should be chosen so that the correction position calculated during balancing lies within the convex zone If...

Страница 86: ...n impeller characterized by fixed components so that their effects are equivalent to those of the correction calculated by the balancing algorithm After selecting the sub function by pressing set the...

Страница 87: ...enter the number of component to be used close to that suggested in origin Balancing report It allows to create a balancing report where the following information are reported 1 Initial synchronous u...

Страница 88: ...ing mode Press BACK to go back to the previous unbalance correction page the key SCREENSHOT allows to capture the screenshot of the display by saving it as a png file see Take screenshot function 14 4...

Страница 89: ...anes A and B are external to the correction planes I and II in the following figure The rotor is almost symmetric i e the distance of its center of mass CM from the bearing planes A and B is almost th...

Страница 90: ...11 20 Rotors balancing mode Empty page...

Страница 91: ...to use the TACHO mode apply a suitable reflecting sticker on the rotating body as a point of reference 0 Connect the photocell optional to the N130 instrument and position it at a distance of between...

Страница 92: ...Press to start the measurement the instrument acquires continuously press again to freeze the acquisition Note The measurement requires the use of the photocell therefore a reflecting plate must be ap...

Страница 93: ...etting of the general operating parameters of the instrument 4 setting of CUSTOM machines related to the SMART ANALYSIS function Sensor setup The N330 instrument can be used only with IEPE sensors bot...

Страница 94: ...s types in SENSOR TYPE SENSITIVITY TYPICAL VALUE ACCELEROMETER mV g 100 VELOMITOR mV mm s 3 94 Use the keys and to access to the sensitivity value setup page Use the arrows keys to enter the correct n...

Страница 95: ...is the average value of the vibration previously squared o this is the typically used value by the european standards above all for acceleration or speed measurements o it is a direct index of the ene...

Страница 96: ...ft being examined This allows including in the spectrum also the high frequency zone where problems relating to the bearings usually occur Number of lines Such parameter defines the number of lines us...

Страница 97: ...ency that can be displayed in the spectrum It can be selected among the default values OFF 10 20 50 100 200 Hz If not enabled OFF the minimum frequency that can be displayed will be twice the resoluti...

Страница 98: ...eys or to set the date in the format DD MM YYYY or the time in the format HH MM Note With regard to the date setup the item YEAR YYYY can be adjusted within the limits 2018 2100 Note Press DONE to con...

Страница 99: ...ASE OS RELEASE BOOTLOADER RELEASE BATTERY CPU TEMPERATURE LEGAL NOTES Firmware update It allows updating the firmware installed in the device in case this is necessary Each new version of the firmware...

Страница 100: ...r more times Wait for the end of operation without intervening Caution The firmware update is a delicate operation and must be performed by carefully following the instructions provided so as not to c...

Страница 101: ...7 4 Open list Allows to view all the CUSTOM machines created by the user Choose the machine of interest using the keys or press to confirm The measure setup of the selected machine is displayed In cas...

Страница 102: ...terest using the keys or By pressing DELETE a warning message requests confirmation on the deletion of the selected machine Use YES to confirm NO to cancel the operation Create new Allows to create a...

Страница 103: ...display confirming the choice with DONE to confirm the operation BACK to cancel Note For each letter use the arrow keys and to confirm The setup screen of the created custom machine is shown Select t...

Страница 104: ...13 12 Setup mode Empty page...

Страница 105: ...nd is subsequently stopped by again pressing The active acquisition status is easy to recognize by the presence of a status LED which is orange flashing slow v 1 4 Battery Function Save measure Availa...

Страница 106: ...project In the saving screen press NEW Type the desired name for the project each single letter that composes the name must be selected by moving with the arrow keys on the keypad visible on the displ...

Страница 107: ...and select the project of interest Inside select the measuring point bearing support number and the orthogonal direction among those available Finally select the measure of interest saved within the m...

Страница 108: ...e value to be set Press DONE to confirm and exit from the SETUP panel Note When DONE is pressed the display returns to the screen from which the SETUP function has been accessed Note The changes made...

Страница 109: ...4 5 Once the screen is captured the display will show confirmation that it has been saved Press to return to the measure screen Note The png files will be saved in the instrument s internal memory N33...

Страница 110: ...14 6 General purpose functions Empty page...

Страница 111: ...nmental Characteristics Temperature from 20 C to 70 C Air humidity from 0 to 95 without condensate Power Supply Battery life more than 8 hours based on typical use of the instrument Charging time 2 5...

Страница 112: ...4 8 4 under the terms of the GNU Lesser General Public License LGPL v 2 1 The full text of the GPL and LGPL licenses can be found on the USB stick supplied with this device and on https www gnu org li...

Страница 113: ...asurements are made on non rotating parts It provides specific guidance to assess the severity of the vibration measured on bearings bearing supports or industrial machine casings when the measurement...

Страница 114: ...o different machine groups as regards the shaft height see ISO 496 The machines in the 4 groups below may have a horizontal vertical or inclined shaft and may be mounted on rigid or flexible supports...

Страница 115: ...this is the rotation frequency in this direction the support system may be considered rigid All other support systems may be considered flexible Typical examples large and medium sized electrical moto...

Страница 116: ...sufficient severity to cause damage to the machine The numerical values specified are not intended to serve as the only basis for acceptance specifications but should be agreed upon between the machin...

Страница 117: ...on severity zones for ISO 10816 3 Group 2 machines Medium sized machines with nominal power above 15kW up to and including 300 kW or electrical machines with shaft heights from 160 mm up to 315 mm Sup...

Страница 118: ...e vibration severity zones for ISO 10816 3 Group 4 machines Pumps with fin rotors and incorporated motor mixed or axial flow centrifugal pumps with nominal power above 15 kW Support class Zone limit E...

Страница 119: ...d for stationary machine tools with nominal operating speeds between 600 r min and 30 000 r min It is applicable to those spindles of the rolling element bearings type only to spindles assembled on me...

Страница 120: ...measured without a tool workpiece mounted in the spindle Measurement locations directions The measurements should be taken on the spindle housing at the front end of the spindle as well as at the back...

Страница 121: ...e of the spindle within a reasonable short time period in most cases ranging from days to six months The vibration acceleration parameter is measured as broadband vibration magnitude in m s2 RMS typic...

Страница 122: ...ction to be taken Zone A newly commissioned machine tools spindles Zone B normal operating conditions unrestricted long term operation Zone C increased vibration magnitudes not suitable for long term...

Страница 123: ...0 10 13 13 iii m s 2 RMS 15 15 20 20 iv m s 2 RMS 20 20 26 26 v m s 2 RMS 25 25 32 32 vi m s 2 RMS 30 30 39 39 vii m s 2 RMS 40 40 52 52 viii m s 2 RMS 50 50 65 65 Table 3 ISO 17243 2 Direct driven sp...

Страница 124: ...C 6 Judgment criteria on machine tool spindles ISO 17243 Empty page...

Страница 125: ...frequent cases of f 2n 3n Eccentricity in pulleys gears etc When the rotation axis does not coincide with the geometric axis Irregular magnetic field in electrical machines Vibration disappears when...

Страница 126: ...ause of insufficient load unstable vibration Rotors with blades for fluid management cavitation reflux etc Unstable frequency and intensity f n x number of blades x number of channels Frequent axial v...

Страница 127: ...OMMON DEFECTS Note The spectra are in an indicative graphic form The N130 equipment produces a different form of graph The following are the spectra of typical vibrations caused by the most common def...

Страница 128: ...D 4 A rapid guide to interpreting a spectrum 3 MECHANICAL LOOSENESS 4 BELT 5 GEARS SIDE BANDS GEAR MESH FREQUENCY 2x BELT FREQUENCY...

Страница 129: ...A rapid guide to interpreting a spectrum D 5 6 SLEEVE BEARINGS 7 ROLLER BEARINGS 8 ELECTRIC MOTORS 2x LINE FREQUENCY TYPICAL FREQUENCIES OF BEARING DEFECTS...

Страница 130: ...rotating external ring fixed internal ring cos PD BD S FTF 1 2 Housing frequency cos PD BD N S BPFO 1 2 Defect on outer track cos PD BD N S BPFI 1 2 Defect on inner track 2 1 2 cos PD BD BD PD S BSP D...

Страница 131: ...body of the impeller Caution Calibration required for each use see E 2 Calibration of the optical photocell The movement of the photocell from to the target determines a new calibration of the same C...

Страница 132: ...uld hit the spotlight center Photocell calibration STEP DESCRIPTION 1 With photocell power on green LED on touch the back of the photocell with a tool e g screwdriver for 2 seconds 2 LEDs green and ye...

Страница 133: ...omplete code 920X30035 Distance from target 100 2000 mm Current consuption 30mA nominal Spare parts CEMB sensor only code 800625541 CEMB cable 2 meters only code 962020718 Connections CONNETTOR PINOUT...

Страница 134: ...00 2000 mm from the mark placed on the impeller the LED placed on the back of the photocell s body lights up once per revolution when the laser beam illuminates the mark reflecting adhesive tape If op...

Страница 135: ...format that describes both the structure and names of the fields as well as their value It has a rigid syntax that allows an implementation of simple efficient and consistent parsing algorithms JSON i...

Страница 136: ...ous versions can be used Power Queries or VBA macros Detailed information on the JSON format are available online As an example https json org ECMA 404 The JSON Data Interchange Standard http www ecma...

Страница 137: ...function o CBA measurement saved in the CBA bearing analysis function An object called dateTime whose value is a string with the measurement acquisition date and time in ISO 8601 format When necessary...

Страница 138: ...1000 0 unit Hz high pass frequency value 0 0 unit Hz No of lines 800 No of averages 1 measureType SYNC 1x FFT overall value 4 806068420410156 unit mm s unit mode RMS spectrum lines 0 0 0 0 0 006694920...

Страница 139: ...uency value 44 766666666666669 unit Hz amplitude value 0 05143612623214722 unit mm s unit mode RMS frequency value 716 15 unit Hz dateTime 2021 02 03T07 57 53 setup max frequency value 1000 0 unit Hz...

Страница 140: ...Hz No of lines 800 No of averages 1 measureType SYNC 1x vibration overall value 8 404687881469727 unit mm s unit mode RMS components unbalance 8 403081893920899 misalignment 0 06441633403301239 loose...

Страница 141: ...t mode RMS StatusSpindle Good condition spindle type INTEGRAL DRIVE electric motor power rating 5 kW bearing type Ball speed value 13055 0 unit rpm speed reference auto detection dateTime 2021 02 05T1...

Страница 142: ...ture Array of projects o Project The various projects are saved with the following structure Rotor Balancing Project name 2PLANES data clockwise true calibration calibration runs done true Sync 1x vib...

Страница 143: ...value 4230 0 unit rpm trial weights weight value 11 0 unit g angle 0 0 radius value 50 0 unit mm done true Sync 1x vibrations amplitude value 4 15290860798192 unit mm s unit mode RMS phase 135 92607 a...

Страница 144: ...x vibrations amplitude values 2 5181249675115269 0 654298714728758 unit mm s unit mode RMS phases 157 83538 34 76033 speeds value 1290 0 unit rpm correction weights weight value 7 907094947993161 unit...

Страница 145: ...the archive of wheel balances in projects All projects are saved in a single JSON file available in the device N330 archive balancing grinding_wheels GrindingBalancing json The file is organized with...

Страница 146: ...e RMS phase 48 0 speed value 1900 0 unit rpm trial weights 0 0 90 0 balancing Sync 1x vibrations amplitude value 2 5 unit mm s unit mode RMS phase 199 0 amplitude value 3 9 unit mm s unit mode RMS pha...

Страница 147: ...t part by using a balancing machine to its peak precision In fact exaggerating the quality requirements would only result in a waste of time and a higher balancing cost without improving the quality o...

Страница 148: ...brations on the pedestals The contents of this pamphlet may be considered to be valid only for rigid rotors unless otherwise specified Unit of measurement of balancing tolerance Balancing tolerance is...

Страница 149: ...Balancing accuracy of rigid rotors G 3 Balance quality grades for various groups of rotors Note The rotor classes in italics are not included in the ISO standards but have been added by the Author...

Страница 150: ...graph as a function of the rotational speed in correspondence with the G grade The residual eccentricity is not a fixed value it may vary for a given G grade between a minimum and a maximum correspond...

Страница 151: ...with other rotors drive elements etc Note 1 Balancing grades 0 4 and 1 For class 0 4 and 1 rotors balancing tolerance must normally be checked with the direct experimental method The influence of the...

Страница 152: ...n relation to the value found e g one third This testing must be systematic so as to take all possible cases of vibration and all possible conditions of the rotor and of the position of the added unba...

Страница 153: ...plies the depth of the drill hole h as a function of the weight to be removed P and the diameter of the drill bit d The curves are plotted for steel density 7 85 kg dm3 taking the conical shape 120 of...

Страница 154: ...weight of a 1 cm long plate as a function of the commercial dimensions of thickness S and width L Divide the unbalance by the weight obtained from the diagram to obtain the length l EXAMPLE Unbalance...

Страница 155: ...Balancing accuracy of rigid rotors G 9 Diagram 1 general diagram of weight removable by drilling in steel For small weight see diagrams 2 3 4 5...

Страница 156: ...G 10 Balancing accuracy of rigid rotors Diagram 2 diagram for fine drilling 0 5 1 5 mm...

Страница 157: ...Balancing accuracy of rigid rotors G 11 Diagram 3 diagram for fine drilling 1 6 mm...

Страница 158: ...G 12 Balancing accuracy of rigid rotors Diagram 4 diagram for fine drilling 2 10 mm...

Страница 159: ...Balancing accuracy of rigid rotors G 13 Diagram 5 diagram for fine drilling 5 12 mm...

Страница 160: ...G 14 Balancing accuracy of rigid rotors Diagram 6 diagram of weight per cm of a steel plate as a function of dimensions L s...

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