abrasive wheels presentation
TRANSCRIPT
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Cormack Associates Ltd 1
Abrasive Wheel Training
Cormack Associates Ltd
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Cormack Associates Ltd 2
Aims To train people in the skills and knowledge
required to enable candidates to select andmount abrasive wheels safely in accordance
with the regulations.
It is not a course on how to use the power
tools.
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Cormack Associates Ltd 3
Provision and Use of WorkEuipment !egulations "##$
!egulation # of PUWE!Every employer shall ensure that all persons who use
work equipment have received adequate training forpurpose of Health & Safety.
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The %ine &e' Points1. dvisory !iterature
". Ha#ards rising from use
$. The %equirements of the %egulations
. 'ethods of 'arking as to Type and Speed(. 'ethods of storage) handling and Transporting
*heels
+. 'ethods of Testing and ,nspection for -amage
. /unction of all components and the correct 'ethodof 'ounting and 0alancing
. 'ethods of -ressing an brasive wheel
2. The d3ustment of the %est
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E(ercise,dentify the ha#ards and list the type aof accidents associated with the use
and incorrect mounting of brasive*heels.
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ccidents 4ontact ,n3uries +56
Eye ,n3uries $56
0urst *heels 156
+6 of all accidents are due to fittingthe wrong type of abrasive wheel
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PPE !euirements
7oggles or face shield 8grade 0 min9
/ire retardant overalls: if possible
7loves Toe protection
Ear defenders for noise
-ust mask
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!euirements of the!egulations
Have a 4ertificate of Training
0e -eemed 4ompetent by your
Employer 8manager or supervisor9
Have your name entered into the /"$+register
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T'pes of Wheels
Type 1 Straight sided vitrified hee!s"ot e#ceedi"g 250mm $%e"ch gri"ders&
Type 27 'e(ressed ce"tre rei"forcedresi"oid gri"di"g hee!s $A"g!e gri"ders&
Type 41) Straight sided rei"forced resi"oid c*t)offhee!s $+etro! c*t)off sas, cho( sas&
Type 42) 'e(ressed ce"tre rei"forcedresi"oid c*t)off hee!s $A"g!e gri"ders&
Metal cutting blades are not abrasive wheels
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)efinition
n abrasive wheel is generally definedas a wheel) cylinder) disc or point having
abrasive particles and intended to bepower driven.
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T'pes of wheel
*itrified
'ade of clay
'eans ; glasslike< =ery brittle
>nly on fi(edmachines
!esinoid
?henolic resin bakelite
bond 'ay have reinforcement
?ortable machines
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+rades of wheel
,oft gradewheels are most suitable for use on hardmaterial
-ard grademost suitable on soft material ourse grainfor rapid removal of material
/ine grainfor polishing
@sing unsuitable wheels may result in the wheel face becomingclogged up) or the wheel becomes gla#ed or polished. Aou maythen try and press harder to get the 3ob done
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E(ercise
What information would 'ou e(pect to
see marked on a wheel 0
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Wheel 1arkings
*heels must have the speed markingsclearly marked in %?'
>ther information shouldincludeB ,i2es: -iameter 0ore and Thickness
,uppliers %ame: ccountability
Usage: Stone or 'etal 8Steel9 3ritish ,tandard 1arkings
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!ev Per 1inutes
,t is very important that the %?' ofthe machine does not eCceed the %?'
of the disk >ver speeding may result in wheel burst
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ommon 1arkings
A.30.R.BF4 suitable for general useon ferrous metals
C.24.R.BF4 suitable for general useon stone5 brickwork5 concrete5
plastic5 and non6ferrous metals
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3ritish ,tandard 1arking ,'stem
A 3 6 P B F
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3ritish ,tandard 1arking ,'stem
A 3 6 P B FA = Aluminium Oxide
High Tensile Materials
C = Silicone Carbide
on!High Tensile
Materials
T"#e o$ %rit
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A 3 6 P B F%rit Si&eHigh oFine %rit
'o( o
Course %rit
T"#e o$ %rit
3ritish ,tandard 1arking ,'stem
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A 3 6 P B FHardnessThe higher the
'etter the Harderthe )heel
%rit Si&eT"#e o$ %rit
3ritish ,tandard 1arking ,'stem
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A 3 6 P B FBa*elite Bond+,esin Bond-
Hardness%rit Si&eT"#e o$ %rit Bond T"#e
3ritish ,tandard 1arking ,'stem
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A 3 6 P B FFibre,ein$orcedBa*elite BondHardness%rit Si&eT"#e o$ %rit
3ritish ,tandard 1arking ,'stem
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A 3 6 P B FFibre,ein$orcedBa*elite BondHardness%rit Si&eT"#e o$ %rit
3ritish ,tandard 1arking ,'stem
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C . / S B FFibre,ein$orcedBa*elite BondHardness%rit Si&eT"#e o$ %ritC = Silicone Carbide
on!High Tensile
Materials
3ritish ,tandard 1arking ,'stem
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A 6 0 M 1Bond T"#eHardness%rit Si&eT"#e o$ %rit 1itri$iedMeans 2to
Ma*e %lass
li*e
A = Aluminium Oxide
High Tensile Materials
3ritish ,tandard 1arking ,'stem
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Inspection of wheels
4heck for -amage
warping
contamination ?rior use
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Inspection of the 1achine
,s the equipment correct for the task
Has the equipment been maintained and
inspected prior to use re all guards in place
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7the ring test8
Hold wheel using dowel 8non metallic9
Tap at equal points around
the wheel using dowel
!isten for crystal like
tone
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,torageWheels must be stored in-ry 4onditions
?referably in the 'anufacturers?ackagingDo ECtremes of
Temperatures>n -esignated Shelving$ Aear shelf life
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-andling and Transportation
*heels should be handled with care
Dot Transported on the 'achine 7reat 4are is needed with
=itrified *heels
lways ,nspect a *heel 0efore /itting
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Petrol 4fuel precautions
Do smoking
void skin contact and inhalation
of fumes Stop machine and allow to cool
before filling
>nly fill in well ventilated areas
*ipe any spilt fuel off themachine
3l tt /l 3 h 9
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3lotters5 /langes5 3ushes 9:ock %uts
3lotters: Spread the 4lamping ?ressureEvenly %equired on all =itrified *heels and 4ut:>ff
*heels above 55mm
/langes: /iC the *heel to the 'achine and
?rovide %otation They must beB
Eual in ,i2e
Undamaged
orrect for the 1achine
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0ushes 4orrect for machine
!ock Duts : 4orrect for machine and handtight using correct tool
3lotters5 /langes5 3ushes 9 :ock %uts
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Wheel 3alancing
Decessary if balance weightsare fitted
@nbalanced wheels causeB =ibration
4hatter 'arks on the 'aterial ?ossible *heel 0urst
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Wheel )ressing
@ncovers /resh 7rit
Squares the /ace
%emoves /oreign 'atter %equires /ull ??E
h l
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The tool rest 1U,Tbe fitted
d3usted to no more than $mm gap from
the wheel
'ust be on or above
the centre line of the wheel
;mm 1a(
Tool !est
entre :ine
Wheel )ressing
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-ealth Effects
Hand rm =ibration Syndrome8H=S9 range of permanent in3uries to the
hands & arms
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-A*,%egular eCposure to vibration can cause permanent
damage to the circulation) nerves) 3oints & musclesin the hands) wrists and arms) leading to symptoms
includingB: ?ain
Dumbness & tingling sensations
4old hands
!oss of manual deCterity !oss of grip strength
*rist pain 8carpal tunnel syndrome9
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*ibration White /inger
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-A*,=ibration *hite /inger
This is the most common form of H=S & is a frequentsub3ect of claims against employers for damage to health
The following symptoms may occur /ingers go white after e(posure to cold 9 are e(tremel' painful /ingers ma' go purple 9 blue and red5 indicating a circulator'
deficienc' %umbness 9 tingling in the hands 9 arms after e(posure to
vibration
:oss of feeling to touch 9 temperature !educed manual de(terit' Permanent damage
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What an Emplo'ees )o0
%eport any symptoms e.g. tingling in the fingers) assoon as they occur
4hoose the right tools for the 3ob
void prolonged use of vibrating tools Ensure tools are well maintained
*ear warm clothing) especially gloves to protect fromcold & wet
Take regular short breaks Feep active to aid circulation
%educe or stop smoking
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,ummar'
lways work safely) if this is notpossibleB
,T