STRENGTHOFMACHINES
SafetyPresenta8on
•  Tosafelymanageandworkwithmachinesinour
industryweneedtounderstandthem
•  Partofthatunderstandingisrecognisinghow
powerfulmachinesare
•  Wemeasurepowerinmanyways.Inthemetric
systemwemeasurepowerinkiloWa;s(kW).
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•  Ourearliermeasureofpowerwashorsepower(hp).Manyof
ourmachinestodaycomeintoAustraliafromoverseas,aresCll
ratedinhorsepowerandweoDensClltalkabouthorsepowerof
amachine
•  Understandinghorsepowerwillhelpusunderstandhowstrong
machinesareandhelpussafelymanagemachinesinourindustry
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•  HorseshavebeenonEarthformanythousandsofyears
•  Weusedhorsesbeforewehadmachines,whichiswhy
weusedhorsepowerasameasureofthepowerofa
machine
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•  Mostofushavehadsomethingtodowithahorseat
someCmeinourlives:
–  asanownerofahorse,
–  asariderofahorse,
–  asaspectatoratahorseevent
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Thinkaboutahorse
Howmanyhorsepowerisonehorsegoodfor?
?
(ThisisnotatrickquesCon)
Answer:
One
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•  DefinedashowmuchpowerrequiredforahorsetoliDaweightusingapulley
•  1hpisapproximatelyequivalentto735wa;s
•  1hpisabout¾ofakW
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•  HowmanyCmesstrongerisahorsethanyouare?
•  Thoughts?
•  Dependsonthetypeofhorseandhowolditisand
howstrongthepeopleareetc
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•  Letssayahorseis10Cmesstrongerthanyou
are
•  10isagoodaverageanditmakesthemaths
simple,
•  Butyoucanuseanynumberyoulike
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•  Howmanyhorsepowerdoesthatmakeaperson
goodfor?
•  Answer:
•  Youaregoodforabout1/10or0.1ofa
horsepower
•  Becauseahorseisgoodfor1hpand10Cmes
strongerthanyouare
•  Holdthatthought
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•  HasanyonehereeverseenaHoldenHSVCommodore?
OraFordPerformanceVehicle?
•  Orownedordrivenone?
•  Probablyoneinthecarparktoday.
•  Howmanykilowa;sarethesecarsgoodfor?
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About300kW
Howmanyhorsepoweris300kW?
About400hp
HowmanyCmesstrongerisacarlikethisthanyouare?
Whenapersonisgoodfor1/10ofahorsepower
Acarisabout4,0008messtrongerthanyou
Guesswhowinsinacollisionbetweenacarlikeoneinthe
carparkandahuman?Iwouldputmymoneyonthecar
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Inminingwehavelotsofmachineswithlotsofhorsepower
AnEimcoloaderisabout200HPor2,000Cmesstrongerthanyou
ACatD11dozerisabout900HPor9,000Cmesstrongerthanyou
ACat789dumptruckis1,900HPor19,000Cmesstrongerthanyou
Thinkabouthowpowerfulanyofthemachinesyouusedinour
industryandhowmanyCmesstrongerthatmachineisthanyouare
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•  Wehaveconveyorsacrosstheminingindustry
•  Anundergroundorsurfaceconveyormayhavesix300kW
drives
•  Thatis1,800kWorapprox.2,400HP
•  Thatmachineis24,000Cmesstrongerthanyouare
•  GuesswhowinsinanaltercaConbetweenapersonanda
conveyor
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•  Whatdoyouhavebetweenyourears
thatthemachinedoesn’thave?
•  Thanksforwatching
•  Staysafe
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