Burrtec Co.,Ltd 1
Contents
1. 0 79 1 79 1 75 1 78 1 61 1 74 1 41 1 48 1 48 2 08 2 13 1 96 1 80 1 82 2 94 3 02 2 77 7 44 7 11 6 75 6 57 6 73 3 33 3 45 3 24 7 93 7 62 7 25 7 00 7 18 7 40 3 66 14 0 67 0 77 0 77 1 00 0 82 0 93 0 85 0 92 1 06 1 17 1 23 1 67 1 72 1 87 1 87 1 82 3 24 3 46 3 60 6 61 6 17 6 72 6 66 6 35 Burrtec Co Ltd 3 47 3 74 3 88 6 90 6 46 7 04 6 97 6 67 6 81 4 32 W11 S2 W11 S2 W11 S2 W11 S2 W11 S2 W11 S3 W11 S3 W11 S3 W11 S3 W11 S3 1 85 2 24 2 05 1 75 1 98 1 78 1 73 1 76 2 25 2 73 2 06 2 28 2 22 2 10 2 13 2 30 2 30 2 34 2 24 2 38 5 06 4 87 5 10 5 19 5 09 4 63 4 22 4 59 4 32 3 92 5 77 5 83 5 93 5 87 5 86 5 47 5 11 5 44 5 36 5 34 5 85 5 34 5 84 7 01 15 0 87 0 92 1 03 0 98 1 03 0 96 1 15 1 04 0 95 0 97 1 90 1 80 1 83 1 87 1 84 1 81 1 93 1 86 1 85 2 01 4 80 5 28 5 16 5 57 5 12 6 28 6 63 6 55 6 83 7 07 Burrtec Co Ltd 5 24 5 66 5 97 5 96 5 54 6 60 7 00 6 89 7 14 7 42 5 59 7 01 6 40 4 07 6 BR SENER CO M AERR EED Consideration lt the result of vibration measurement for simulated operation gt S R crimp2. RR CIRE EOS IRD HGS lt ERFRSEIDSRTE 1 H DER RIOFERICR lt ROCEMHSDCS MD W6 6 W7 ILBLNTE BUER UNS CED TINS DEEE ERUROWAL Amin CEA MOAD REED S lt RAS LLSSENNNOET W12 DERURDAYIDPSUCHW CH HELL O SARDA WEEDE RTD E TSZEICSN RES SURAMSASNET 7 838 Conclusion From the results of this experiment we can see it clearly that the vibration magnitude of cup brush varies greatly from new to used ones Consequently we can have to calculate the daily vibration exposure time corresponding to the Daily Vibration Exposure Limited Time 5 0m s and if the value is above 2 hours the daily vibration exposure time should be controlled within 2 hours for the present However this does not apply to the situations as follows Inspection and maintenance of the vibration tools are performed based on the time and the method described in the manufacturer s or the importer s instruction manual And also Vibration Exposure Limited Time is determined by the max value of the vibration total value of frequency weighted r m s acceleration root sum of squares of AHW values for the three measured axes of vibration a which is measured and calculated before and after the inspection and maintenance However the daily exposure time must be controlled within 4 hours even though inspection and maintenance are executed accordingly Therefore we attach importance to the daily management of the variation of vibration magnitude EDR KO ADYAIDPSL
3. based ISO22867 Vibration tools on the rules of experiment i EN50144 X X or EN60745 manufacturers amp 1 RANK 3 ARERR RE importers 0710 3 MED 3 WERE ORE RARE EX 0710 835 2 the measurement and expression of ire TAORS vibration total value of HAA frequency weighted r m s acceleration measurement method in the root sum of squares of ahw values for the operation environment three measured axes of vibration which is F RRI SEE not based on the rules of experiment JIS B 7761 2 2 ste ACK SAR RAG LE HK SPDR ERIE 3 MERE ORE RKE The management of operation time due to daily vibration exposure calculated from vibration total value of measurement method in the 1 0710 1 frequency weighted r m s acceleration operation environment Companies 2 0710 2 root sum of squares of ahw values for the FRE 1 33071015 three measured axes of vibration Vesti CIT SHEE JIS B 7761 2 2 3071025 acquired from the experiment IB TERRIER SITE MED 3 HARE DSR UC ARIS lt EBA 8 CR SFR IO BIBS E note1 the measurement and indication of vibration total value of frequency weighted r m s acceleration root sum of squares of ahw values for the three measured axes of vibration of the vibration tools 2009 7 10 0710 3 GE 1 HLESO ARAA ERDRE RTE 3 MERE ORE RTEICDUT F 21 7 A 10 HAVER 0710 35 note2 the handling operation guidline of chain saws 2009 7 10 0710 1 GE 2 FL DVY BU
4. 0 70 1 61 1 80 1 43 1 40 1 33 1 00 0 97 0 94 0 79 0 89 0 89 1 21 1 10 1 07 0 98 1 11 1 09 1 11 1 10 1 10 1 09 1 43 1 44 2 85 4 21 3 88 3 88 3 92 3 67 2 79 2 25 2 46 2 26 2 44 5 35 5 14 4 73 4 39 5 02 3 27 2 80 2 07 1 74 1 59 2 79 2 87 3 42 4 79 4 19 4 18 4 18 3 83 3 04 2 50 2 64 2 51 2 67 5 53 5 31 4 90 4 56 5 20 3 51 3 14 2 48 2 21 2 11 3 20 3 29 4 23 2 67 5 10 2 69 3 30 11 16 28 02 7 69 27 63 18 36 13 0 77 0 85 0 79 0 73 0 75 0 86 0 80 0 65 0 71 0 68 0 66 0 83 0 85 0 93 0 90 0 90 0 87 0 80 0 78 0 85 0 93 0 72 0 73 1 13 1 92 1 79 1 56 1 68 1 86 1 98 1 89 2 06 2 04 1 99 1 64 1 70 1 76 1 44 1 52 1 44 1 34 1 27 1 41 1 48 1 22 1 17 5 22 5 48 5 69 5 70 5 58 5 00 4 94 5 17 5 32 5 39 5 19 3 99 3 78 3 55 3 31 3 23 3 13 3 29 3 32 3 30 3 23 3 12 3 02 Burrtec Co Ltd 5 39 5 87 6 02 5 95 5 88 5 40 5 38 5 55 5 75 5 80 5 59 4 39 4 23 4 07 3 72 3 68 3 55 3 64 3 64 3 69 3 67 3 43 3 32 5 82 5 61 4 02 3 64 3 57 5 90 6 35 12 37 15 11 15 71 W7 S3 W7 S3 W7 S3 W11 S1 W11 S1 W11 S1 W11 S1 W11 S1 0 70 0 75
5. Burrtec Co Ltd Report on the experiment of vibration measurement of Wire Brushes mounted on hand held power tools DIV FIT MAT HOFRH ALA EAD Ritilc OWT In this report the purpose of the experiment is to clarify the vibration risks caused by the use for example removing rust removing scale removing slag removing paint and surface finishing after welding etc of wire cup brushes mounted on hand held power tools grinders in each of the state of wire cup brushes never been used and the state of wire cup brushes used for 30 minutes by the Hand Arm Vibration measurement amp evaluation method based on ISO 5349 1 ISO 5349 2 JIS B 7761 2 JIS B 7761 3 The result of the experiment was evaluated by assessment methods based on ISO and JIS and the Vibration Guide issued by the Japanese Ministry of Health and it became clarified as follows COMES CS DIV HvoIS eFRPALS 257129 CRROMT CTS VER FIRE FORD 25 20 ATY BRDU AT I PRE TARO ESS SIT RICHES SiR 027 HOARE 30 MEABOKEOENE NCHSINCT ES TES ISO 5349 1 ISO 5349 2 JIS B 7761 2 JIS B 7761 3 CAD CF HRSA MAA CHE L HL EDER ISO RU JIS RUFE 21 7 10 RICE SEE LORMAN ROIS CBO VERSET ACK DEMOER DFOSHIAS NCIS amp Lic 1 HAMS Introduction The onset of Hand arm Vibration Disorder is considered to be due to vibration exposure to the hand held power tools used in the working field Therefore it is necessary to clarify whether the hand arm vibration expo
6. ahv RMS X RMS Y RMS Z 5 UF COMRBAERR The result of vibration measurement for simulated operation The daily vibration exposure time below we use T as daily vibration exposure time corresponding to Daily Vibration Exposure Limit Value 5 0m s is calculated by the following formula 200 Daily Vibration Exposure Limit Value T time ahv x ahv alm s is vibration total value of frequency weighted r m s acceleration root sum of squares of ahw values for the three measured axes of vibration RES lt ERME 5 0m s OSE 1 ADRESSE UF RIS lt IRA Ti 205 Pact CHWLEL Teo 200 Fiend lt IRE TL fi ahv x ahv a M S SERA ERIE FEN 3 Shas 11 Burrtec Co Ltd Fous unused 30 SAF used for 30minutes RMS VTV AVERAGE RMS VTV AVERAGE RMS X RMS Y RMS X RMS Y RMS Z ahv ahv ahv ahv W4 S1 1 18 2 28 3 86 4 64 0 80 1 41 5 20 5 44 W4 S1 1 34 2 55 3 84 4 81 0 75 0 97 5 28 5 42 4 15 11 59 5 46 6 71 W4 S1 1 08 1 93 3 61 4 23 0 78 1 24 5 20 5 40 W4 S1 0 89 1 61 3 18 3 67 0 76 1 35 5 43 5 65 12 W4 S1 W4 S2 W4 S2 W4 S2 W4 S2 W4 S2 W4 S3 W4 S3 W4 S3 W4 S3 W4 S3 W7 S1 W7 S1 W7 S1 W7 S1 W7 S1 W7 S2 W7 S2 W7 S2 W7 S2 W7 S2 W7 S3 W7 S3 0 99 1 39 0 65 0 66 0 61 0 47 0 74 0 58 0 52 0 64 0 61 0 70 0 70 0 71 0 75 0 73 0 67 0 88 0 81 0 80 0 86 0 64
7. DST E KDBZEDIIANITETENTSRENSSINREDEREENRTSICHI DE AMORSM AAEL TMS SHO R i COBO FINS CORNE CBEST 18 Burrtec Co Ltd Cooperation of the experiment With Setsuo Maeda Dr Eng Dr Med Sci Professor of Human Vibration Human Response to Vibration Research Laboratory Department of Applied Sociology Faculty of Applied Sociology Kinki University Japan Ae KAS RASS RRS SA Rae Bux BERTE Reported by Masatomo Komai Manager Marketing department Burrtec Co Ltd Japan DHEA X FI OR kts sy Translated by Kenichiro Arai Ryo Sawanishi Sarah Geng Burrtec 19
8. ET IME 12 500 El z 70mm W8 Burrtec BeeRex Diameter Steel Wire rpm 5 19 8 31 3 51 16 76 0 35mm J F YJ IME 14 000 iz 70mm W9 Osborn 608131 Diameter Steel Wire rpm 6 23 6 36 5 74 6 08 0 35mm ARM I IME 11 000 FE 65mm W10 Bison BS65M10 035 Diameter Steel Wire rpm 7 00 4 21 5 53 6 54 0 35mm N4Uy IME 12 500 FE 65mm W11 Monotaro 09151895 Diameter Steel Wire rpm 6 19 5 50 6 47 4 93 0 35mm E 90 IME 12 500 El amp z 65mm W12 SUN POWER CN 22 Diameter Steel Wire rpm 4 24 8 56 3 44 16 87 0 50mm IME 12 000 iz 75mm W13 Nishiki TN 075K4 DiameteriSteel Wire rpm 4 56 9 32 5 02 8 01 0 35mm am IME 12 300 Ex 75mm The table above shows the summary of the result of the simulated operation experiment for used knot wire cup brushes From this result It is evident that the knot wire cup brushes W8 could be used for longer working time considering vibration exposure limited time because that the vibration magnitude becomes lower after the usage In the case of W6 and W7 we can see that for the knot wire cup brushes even though the vibration magnitude turned to be lower than which in the idling experiment the vibration magnitude tended to be increasing after the usage Also for the knot wire brush W12 the vibration magnitude turned to be decreased after the usage There is a possibility that the vibration magnitude can be decreased and stabled from the usage 17 Burrtec Co Ltd ERKO EH FRRORAMHOCRURMOIEROECHERLED CORDS ERUROWA W8 l
9. EHORCEA5N TUS AIRS lt EIRE 5 0m s OX URE 1 ORES 9 z Burrtec Co Ltd ES UF ri lt RRM TES AEL ON 2 HEHE SGL SE 1 HDi lt BIS 2 18 HAUFE DZ ETA LIRNA DRN EMSC EUR knot wire EX UR knot wire unused Used for 30minutes Libre 30 SFR H ahv H W6 Burrtec i ire rpm 19 21 5 92 5 72 14 000 El z W7 Burrtec i i ire rpm 8 64 3 22 19 32 12 500 Ex W8 Burrtec i i rpm 9 78 4 33 10 69 14 000 El z rpm 8 46 3 64 15 12 11 000 El z W10 Bison BS65M10 035 rpm i 8 07 4 39 10 40 12 500 Ex W11 Monotaro 09151895 i i rpm 16 74 4 14 11 69 12 500 Ex W12 SUN POWER i ire rpm 20 74 2 60 29 56 12 000 Ex rpm 16 04 4 32 10 70 12 300 Ex The vibration magnitude of W12 is the lowest in both of the brushes unused and used He RES W12 OHNE NEN DT 10 Burrtec Co Ltd The vibration magnitude of W6 was higher than that of W12 However when comparing the value of axis x axis y and axis z of the result of five measurements we found that the vibration of w6 was concentrated on axis z and the vibration of W12 was concentrated on axis y Therefore W12 seem to be unbalanced W6 Ik W12 HREMEN AUD FEIT W6 amp W12 05 BIOBERRO x Gh yh z PAEARU CHSE W6 ORB z SHICSALTHO W12 OBS y HICBRALTUISTEMNDOKRT TCOTEKO W12 ANSVARBWUESICRDN EF W6 30 SEA used for 30 minutes AVERAGE ahv RMS X RMS Y RMS Z W12 30 S F amp used for 30 minutes AVERAGE
10. OREMES RATS CCICKO HEM AS lt BOTS CEMWSDCS ito CT FiBL lt SIRFME 5 0m s HEUTE 1 ROSES UF TEAK BIRR T ES ZAHL Z NB 2 Her SALE SH 1 ADORE lt BRS ZAPF CTSCe REL KIISDAR Ehe REAA HA BD Ea TR UH ROTT AC KDE SECC PAT SECORHLAO ARAL RED 3 HARE aa FR MORTE SO CHE HAL TL SA ICE IT IRIS lt ERAS SRA SED DLEBDERTS LER COMO CRUCC BH CORATE TEL AAE EEE 4 REF ETS CEMBELCE Cliche OfREEORNt BES SEN DS LERSNET 8 7vY2ORf Burrtec s Opinion At the moment the vibration magnitude of the hand held power tools with wire cup brushes mounted are not in under control even though inspection and maintenance of the tools itself have executed and its vibration magnitude has controlled As the result of this experiment we proved that the vibration magnitude of the cup brush depends on its manufacturer type shape size and manufacturing method etc Hereafter to provide the information about the fact that vibration magnitude varies when the cup brush has mounted on the hand held power tools and the necessity of selecting a cup brush with less vibration magnitude it is required to construct the standard of measuring and evaluation method for the cup brush itself and managing procedure for the working field RES CIS TRAO BAZIT HROMRE M R RSNTUSG CE AmLAELTODITIEZE T Sik COREE L BENTUETA SEARO HVTITEL AH DAT HER HIK BEHHRECKIT TNENOIE ANEDEMELAERENNSSZEENNDEULR SBI Y IIHULT AYIDSLTEBAT 3 CR NOSEN
11. R VERHEEHILDUNT F 21 7 A 10 HAVER 0710 15 note3 the prevention measures against Vibration Disorder related to handling operation of vibration tools except for chain saws 2009 7 10 0710 1 GE3 FL DV IIDEHTADHEER ISCAS IRS Fa RBH COUT F 21 7 A 10 HER 0710 2 5 La Burrtec Co Ltd The implementation of Hand Arm vibration exposure value investigation 2 FREE BAO RE GER measurement equipment We used the equipment as follows B amp K Co Ltd Type 4447 HAVS Hand Arm Vibration and Whole Body Vibration Meter to measure the Hand Arm Vibration Exposure value compliance to ISO 5349 1 the measurement and evaluation of Hand Arm Vibration and ISO 8041 2005 JIS B 7760 1 2004 ISO 5349 1 FR MO AE LEE RUN ISO 8041 2005 JIS B 7760 1 2004 C MLEFRRMALE LL RILTOFF RE RREZES 26 Faclcr d RE BK ft Type 4447 HAVS Hand Arm Vibration and Whole Body Vibration Meter EA L USATE Tools used Hitachi Koki co Ltd 100mm electric disk grinder GLOSH4 rpm12 000 min Beats min BLIKA 100mm BAT 1 AZIIS1TL gt S G10SH4 lee 12 000min 0 43 G ED1T 2v72352 Wire cup brushes for measurement In this experiment we used 13 brushes in total including 2 type of wire shape crimped wire and knot wire SHORE CAS SIV DYVTITEITREERURD 2 ERDEREE 13 AAN EUR ww SiR Crimped wire uw C RUER Knot wire U S Crimped wire wi W2 W3 Wa W5 Burrtec FYJ Burrtec 7 y 7 monotaro T 90 naru
12. ed wire Burrtec 30790 Wi _ FI Burrtec CW75 C25 Wi _ FI monotaro 06747194 W3 ET 30 narutoya C 20 W4 BPE SUN POWER CN 4 W5 Diameter SUS0 35mm rpm IME 14 000 EIR 76mm Diameter Braided Brass Coated rpm Crimped Wire EX vl IME 4 0 27mm 12 000 Ex 75mm DiameterSteel Wire H MIAF L 0 30mm IME rpm 12 000 75mm OA Diameter Braided Brass Coated rpm Crimped Wire ME WG OE o 25mm 12 000 Elta 75mm Diameter Braided Brass Coated rpm Crimped Wire IMZ sm y ERB KO 12 000 FE 73mm 4R 0 27MM Burrtec Co Ltd unused randy AVERAGE AVERAGE ahv TL 11 2 2 38 5 53 7 35 5 80 9 00 3 68 16 92 4 27 11 05 Used for 30minutes 30 DER AVERAGE AVERAGE ahv TL 3 96 12 79 5 85 4 84 4 93 9 59 5 63 6 32 3 29 18 64 According to the table above we can see that the average ahv of the used W1 was significantly decreased compared to that of the unused And we think that the balance of the brushes improved after the usage ERKO FREE CO ROAA WIN Frm 06 30 ERROAN ahv OEM REC NE lt RITED 11 2 gt 3 96 PATSCECKO NSVARR lt RODE EDBHERDNES EAU R knot wire 16 unused Han AVERAGE ahv AVERAGE TL Used for 30minutes 30 SMEAR AVERAGE ahv AVERAGE TL LA Burrtec Co Ltd We Burrtec 94729 Diameter Steel Wire rpm 2 78 27 61 4 61 9 45 0 35mm N FVD IME 14 000 El amp z 70mm W7 Burrtec Hurricane Diameter Steel Wire rpm 3 69 17 89 3 74 14 39 0 35mm 7w9 YU
13. mm 12 000 Fix W4 narutoya C 20 Diameter Braided Brass Coated Crimped rpm 3 64 15 06 5 26 7 23 Wire SWG BLO BR BPE SMZ 75mm ed 12 000 Fr W5 SUN CN 4 Diameter Braided Brass Coated Crimped rpm 5 17 7 50 3 93 12 96 POWER Wire RA Y F R BAO MZ 75mm 48 0 27mm 12 000 El z The vibration magnitude of unused W4 is the lowest among those unused brushes But the balance of the axis became deteriorating after used And the vibration magnitude of axis x and axis y turned to be higher and the overall vibration magnitude also turned to be higher compared to the value of unused brushes Hure W4 DREAD DE LL BA TSZECISD HOTSTIANE lt RD x y HORDEN ES lt 0 EMEA ren kO SEREDAN EATER TWEET W1 was unbalanced and the vibration magnitude was the highest But after being used the balance became better and Vibration magnitude became lower than that of w4 Wik NNSUVADE lt RESOA SIRT LAL EATSZEICKD NSVAPRR lt RO IREMER WA LOB S lt RDEUR The vibration magnitude of W5 was the worst among those used brushes ERRDEREHES W5 DREIER OELE But it s evident that the daily vibration exposure time must be controlled below 2 hours even if the daily vibration Exposure Limit Value of W1 W5 which is calculated by the daily vibration exposure time below we use T as daily vibration exposure time is over 2 hours corresponding to the Daily Vibration Exposure Limited Time of 5 0m s in the vibration guideline LAL Wi W5 OFS IRIEL HBIO
14. or S2 wi S3 amp A operator S3 wi La Burrtec Co Ltd 3 FA KUL CORMAN The result of vibration measurements during the idle time The daily vibration exposure time below we use T as daily vibration exposure time corresponding to Daily Vibration Exposure Limit Value 5 0m s is calculated by the following formula 200 Daily Vibration Exposure Limit Value T time ahv x ahv alm s is vibration total value of frequency weighted r m s acceleration root sum of squares of ahw values for the three measured axes of vibration Airaid EIRE 5 0m s CHEE 1 BORDS BS UF RSS IRA TEN Fact CBM LE Aires lt ERE Ti pse ahv x ahv a M S ERE ERER 3 ARAE Front unused 30 MERK used for 30minutes RMS VTV AVERAGE RMS X RMS Y RMS Z TL ahv ahv ahv RMS VTV AVERAGE RMS X ahv Tools only CLADH 4 Burrtec Co Ltd Burrtec Co Ltd 4 BE lt 7 KULORCORDNERR EED Consideration lt the result of vibration measurement during idle time gt VSR Crimped wire UISAR crimped wire unused Used for 30minutes Saabs 30 MER ahv TL ahv TL Wi Burrtec 30790 Diameter SUSO 35mm rpm 14 86 0 91 14 51 9 85 Viry 2 MZ 76mm 14 000 Fr W2 Burrtec CW75 C25 Diameter Braided Brass Coated Crimped rpm 5 56 6 47 7 98 3 14 Wire FW JMZ 75mm RB 027mm 12 000 HE W3 monotaro 06747194 Diameter Steel wire rpm 5 42 6 81 4 38 10 42 E S0 YMZ 75mm H MIAF L0 30
15. sure arising from hand held power tools used in various working fields leads to Hand arm Vibration Disorder But before this experiment conducted by us there is no such data of vibration due to the use of wire cup brushes mounted on grinders In addition there is no international experimentation discipline for experiment leading the vibration magnitude for the operation of wire cup brushes mounted on hand held power tools FR RH SOREDRR IS RS CASNI ER TIEDIRMRENRARELTEZSNTUETS EDC RACE CE AENUSFHINIANSRETSFIIKDHDI lt BHEN FRDEERELLESLTRUISELN TS SD ER S DMUC TSLERSDET LOL SEDRRAHIE DIV gt HVTITEZERLITTIICHONF GAS SHORMIEICRIUTC fr 5F SPHSMCENTUVAUMARICHOEST EK ERB 910 PST eS BSR LS ICMO MICO mee SHS SARMAIGEHSNTUETA Therefore we projected the vibration measurement experiment to clarify the actual state of vibration and the vibration risk lurk in the working field TOT Bin CERN CNS RBI Y PST AFRMALSICMOM CHAS SRORDRBRSEMSDICL RAFKO ire VATA SINC SOO RSs A cate LAL Burrtec Co Ltd The summary of operation time management based on daily vibration exposure value BREE BEA 8 CRO lt RRS OME Object WR No 285 Content AZ Rules of experiment related BEER IR 1 the measurement and expression of vibration total value of Rules of experiment frequency weighted r m s acceleration VERA AI root sum of squares of ahw values for the JIS B 7762 three measured axes of vibration
16. toya Be 30790 CW75 C25 06747194 C 20 SUN POWER CN 4 EUR Knot wire W6 W7 W8 w9 W10 W11 W12 W13 Burrtec FYJ Burrtec 7 y 7 Burrtec F y 7 Osborn ARM I Bison VI Monotaro J30 94729 Hurricane UT 2 BeeRex 608131 BS65M10 035 09151895 SUN POWER ICN 22 Nishiki an N 075K4 Diameter ME 76mm Diameter ME 75mm Diameter ME 75mm Diameter ME 75mm Diameter IME 75mm Diameter MME 70mm Diameter MME 70mm Diameter MME 70mm Diameter ME 65mm Diameter IM 65mm Diameter IM 65mm Diameter MME 75mm Diameter MME 75mm Le Burrtec Co Ltd SUSO 35mm rpm 14 000 El amp z Braided Brass Coated Crimped rpm Wire ERX y FR 0 27mm 12 000 Bln Steel wire rpm 12 000 El amp z H MIAF L 0 30mm Braided Brass Coated Crimped rpm Wire SWG EK OBR 0 25mm 12 000 El amp z Braided Brass Coated Crimped rpm Wire SRX Y FARCE K D R 0 27mm 12 000 Eli Steel Wire 0 35mm rpm 14 000 iz Steel Wire 0 35mm rpm 12 500 El z Steel Wire 0 35mm rpm 14 000 lir Steel Wire 0 35mm rpm 11 000 El z Steel Wire 0 35mm rpm 12 500 El z Steel Wire 0 35mm rpm 12 500 El z Steel Wire 0 50mm rpm 12 000 El z Steel Wire 0 35mm rpm 12 300 El z z Burrtec Co Ltd 5 types of crimped wire cup brushes in the front line and 8 types of knot wire cup brushes at the back line are showing in the pict
17. ure on the left DS DAPISXS EAO SK 58 BO CRUROAYTIISy GUEA measurement method After mounting each of the wire cup brushes to grinders we measured vibration total value of frequency weighted r m s acceleration by 3 axes at the holding point and calculated root sum of squares of ahw values for the three measured axes of vibration from the vibration magnitude of those four conditions idling of an unused brush simulated operation of an unused brush idling of a brush used for 30 minutes simulated operation of a brush used for 30 minutes based on the ISO 5349 2 field measurement method ENENDITV HYVTITTERITFTTIIERDISF ISO 5349 2 DASANETTACHEIT 4 DOR Om COW 1 R UDR Ont CORBI 030 MERRI RUVAR 30 HEROES CORMIER LL SLO CO 38H x y 24h ORIRAERSILREBeHEL CO 3 HOSP EROE Lic lt P KUL THOR O gt Idle measurements We measured the vibration magnitude of each of the idling cup brushes for 5 times during the idling time with one operator LADHF ET 74 RULD OMREM Z D 77252 CES HEAL 1 HOME 30 PUNCLELE Burrtec Co Ltd 88888 20008 20008 lt EHHFESOHATED gt Simulated operation measurements We measured the vibration magnitude for 5 times for each cup brushes in simulated operation with 3 operators Each measurement time was within 30 seconds 3 AORE CE FEES COREA DY AIST Cele SEE LE 1 DORE AIS 30 BUNELEULR Si amp A operator Si wi S2 amp A operat
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