abrasive wheels presentation

7/25/2019 Abrasive Wheels Presentation

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Cormack Associates Ltd 1

Abrasive Wheel Training

Cormack Associates Ltd


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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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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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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



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A 3 6 P B FHardnessThe higher the

'etter the Harderthe )heel

%rit Si&eT"#e o$ %rit



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A 3 6 P B FBa*elite Bond+,esin Bond-

Hardness%rit Si&eT"#e o$ %rit Bond T"#e



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A 3 6 P B FFibre,ein$orcedBa*elite BondHardness%rit Si&eT"#e o$ %rit



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A 3 6 P B FFibre,ein$orcedBa*elite BondHardness%rit Si&eT"#e o$ %rit



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C . / S B FFibre,ein$orcedBa*elite BondHardness%rit Si&eT"#e o$ %ritC = Silicone Carbide

on!High Tensile

Materials



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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



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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

abrasive wheels presentation

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