Husqvarna PG 530 Le manuel du propriétaire

Marque: Husqvarna

Modèle: PG 530

Taper: Le manuel du propriétaire

HUSQVARNA CONSTRUCTION PRODUCTS

Operator’s manual

Please read the operator’s manual carefully and make sure you

understand the instructions before using the machine.

Manual de

instrucciones

Lea detenidamente el manual de instrucciones y asegúrese de

entender su contenido antes de utilizar la máquina.

Bedienungsanweisung

Lesen Sie die Bedienungsanweisung sorgfältig durch und machen

Sie sich mit dem Inhalt vertraut, bevor Sie das Gerät benutzen.

Manuel d’utilisation

Lire attentivement et bien assimiler le manuel d’utilisation avant

d’utiliser la machine.

GB ES DE FR

PG 530

2 - English

Contents

English - 3

Contents

English

Contents

Key to symbols 4

Safety Instructions 5

Introduction 6

Transportation 6

Storage 6

What is what 7

Setting up/Operation 9

Changing the diamonds 11

Variable speed drives/

frequency converters 12

Faults and troubleshooting 15

Diamonds 17

Diamond selection 18

Maintenance 22

Maintenance schedule 25

Technical Data 26

4 - English

Key to symbols

The symbols below are used on the machine and in

this Operator’s Manual. It is important that the user

understands the signiﬁ cance of these in order to work

with the machine safely.

Please read the operator’s manual

carefully and make sure you under-

stand the instructions before using the

machine.

WARNING! Dust forms when grinding

which can cause injuries if inhaled. Use

an approved breathing mask. Always

provide for good ventilation.

Always wear:

• Approved protective helmet

• Approved hearing protection

• Protective goggles or a visor.

• Dust forms when grinding, which can

cause injuries if inhaled. Use dust

mask.

Always wear sturdy non-slip boots with

steel toe-caps.

Always wear approved protective

gloves.

Inspection and/or maintenance should

be carried out with the motor switched

off and the plug disconnected.

Visual check.

Regular cleaning is required.

This product is in accordance with ap-

plicable EC directives.

Key to symbols

English - 5

• Never use the machine if you are tired, if you have

drunk alcohol, or if you are taking medication that

could affect your vision, your judgement or your co-

ordination.

• Never use a machine that has been modiﬁ ed in any

way from its original speciﬁ cation.

• Be on your guard for electrical shocks. Avoid having

body contact with lightning-conductors/metal in the

ground.

• Never drag the machine by means of the cord and

never pull out the plug by pulling the cord. Keep all

cords and extension cords away from water, oil and

sharp edges.

• Make sure the cord is not pinched in doors, fences

or the like.

• Check that the cord and extension cord are intact

and in good condition. Never use the machine if the

cord is damaged, hand it in to an authorized service

workshop for repair.

• Do not use a rolled up extension cord

• The machine should be connected to an earthed

outlet socket.

• Check that the mains voltage corresponds with that

stated on the rating plate on the machine.

• Ensure the cord is behind you when you start to

use the machine so that the cord will not be dam-

aged.

At no time should lifting of machinery be attempt-

ed without mechanical means such as a hoist or

fork lift.

WARNING!

Overexposure to vibration can lead to circula-

tory damage or nerve damage in people who

have impaired circulation. Contact your doc-

tor if you experience symptoms of overexpo-

sure to vibration. These symptoms include

numbness, loss of feeling, tingling, pricking,

pain, loss of strength, changes in skin colour

or condition. These symptoms normally ap-

pear in the ﬁ ngers, hands or wrists.

Safety Instructions

WARNING

Under no circumstances may the machine be

started without observing the safety instruc-

tions. Should the user fail to comply with

these, Husqvarna Construction Products

Sweden AB or its representatives are free

from all liability both directly and indirectly.

Read through these operating instructions

and make sure that you understand the

contents before starting to use the machine.

Should you, after reading these safety in-

structions, still feel uncertain about the safety

risks involved you must not use the machine,

please contact your dealer for more informa-

tion.

• Please read the operator’s manual carefully.

• Only qualiﬁ ed staff should be allowed to operate

machinery.

• Never use a machine that is faulty. Carry out the

checks, maintenance and service instructions

described in this manual. All repairs not covered in

this manual must be performed by a repairer nomi-

nated by either the manufacturer or distributor.

• Always wear personal safety equipment such as

sturdy non-slip boots, ear protection, dust mask and

approved eye protection.

• The machine should not be used in areas where

potential for ﬁ re or explosions exist.

• Machinery should only be started when grinding

heads are resting on the ground unless carrying out

a testing procedure as outlined in this manual.

• The machine should not be started without the

rubber dust skirt attached. It is essential a good

seal between machine and ﬂ oor be established for

safety, especially when operating in dry grinding

applications.

• When changing the grinding discs ensure power

supply to the unit is OFF by engaging the Emergen-

cy Stop button and the power-plug disconnected.

• The machine should not be lifted by handles, mo-

tor, chassis or other parts. Transportation of the

machine is best done on a pallet/skid to which the

machine must be ﬁ rmly secured.

• Extreme caution must be used when moving

machinery by hand on an inclined plane. Even the

slightest slope can cause forces/momentum making

the machinery impossible to brake manually.

Safety Instructions

6 - English

Introduction

The Husqvarna PG 530 ﬂ oor surfacing machines are

designed for wet or dry grinding of marble, terrazzo,

granite and concrete. Their applications range from

rough grinding through to a polished ﬁ nish.

This manual covers the Husqvarna PG 530 series of

ﬂ oor grinders equipped with twin motor drive here after

referred to as Dual Drive Technology™.

It is extremely important all users be familiar with the

contents of this manual before commencing operation

of either machine. Failure to do so may result in dam-

age to machinery or expose operator to unnecessary

dangers.

IMPORTANT!

Only staff that have received the necessary

education, both practically and theoretically

concerning their usage should operate the

machinery.

Transportation

The machine comes equipped with inbuilt advanced

electronic systems called variable speed drives or

frequency converters. These drives enable the variable

speed and direction component of each of the motors.

The drives are located in the steel cabinet mounted on

the machine chassis.

As with all electronic equipment, the drives are sensi-

tive to excessive vibration, rough treatment and high

levels of dust. Much care and attention has been given

by the manufacturer to ensure maximal protection is

given to the drives. Note the shock absorbing mounting

system used to mount the steel cabinet on the machine

chassis/ frame.

When transporting, it is important to ensure the ma-

chinery is properly secured at all times to eliminate

“bouncing” of the variable speed drives. Ensure the

chassis or frame section of the machine is secured

down at all times when in transit.

The machine should always be transported under

cover limiting the exposed to natural elements – in

particular rain and snow.

IMPORTANT!

The machine should not be lifted by handle,

motor, chassis or other parts. Transportation

of the machine is best done on a pallet/skid

to which the machine must be ﬁ rmly secured.

Do not attempt to slide the tines/forks from

a fork lift under grinding heads unless on a

pallet/skid. Failure to do so can cause irrepa-

rable damage to grinding heads of machine

and internal parts.

It is recommended that machinery be transported with

a set of diamonds attached at all times to ensure pro-

tection of locking mechanism for diamond plates.

Storage

The machine should always be stored in a dry place

when not in use.

Introduction

English - 7

What is what

1. Hour counter

2. Electrical cabinet

3. Planetary head motor 1.5kW/1Hp

4. Grinding/Satellite heads motor 3kW/4Hp

5. Lifting lugs

6. Cover/Shroud

7. Skirt

8. Chassis/Frame

9. Handle bars

10. Control Panel

11. Handle bar adjuster

What is what

11.

10.

8 - English

The machine can be divided into two main parts. These

can be identiﬁ ed as follows:

1. Chassis/Frame section – comprising handle bars,

electrical cabinet, steel frame and wheels.

2. Head – comprising of motors, cover, grinding/satel-

lite/ planetary heads and internal components.

The machine has been manufactured to allow move-

ment between the chassis and head via the connection

point at the lifting lugs and chassis pins. This move-

ment is important during the grinding process as it

creates a “ﬂ oating” effect for the head.

The ﬂ oating gives the head a self-leveling effect, negat-

ing the need to adjust the height of the head as the

machine passes over ﬂ oor areas with different slopes

or undulations.

Control panel

The control panel consists of a number of switches and

dials giving 6 separate controls (see picture).

Power - This button, when depressed, will turn on

power supply to the unit when the EMERGENCY

STOP button has been released.

Emergency Stop - When pushed will immediately

shut down machine by totally stopping power supply to

drives/ frequency converters in electrical cabinet.

Disc Speed - Speed control for grinding heads and

planetary head.

Fwd/Rev (Red) - Direction control for grinding heads

and planetary head.

Reset - Will clear fault function/error message on drive/

frequency converter (located in electrical cabinet) in

case of fault occurring.

Stop/Run - To start or stop machine during normal

operation.

IMPORTANT!

It is important to use the STOP/RUN switch

to control the running of the machine, not

the EMERGENCY STOP button. Each time

the EMERGENCY STOP button is pressed

it shuts down the drive/frequency converter.

Frequently powering up and down of the

drive/frequency converter will reduce the life

span of the drive/ frequency converter.

IMPORTANT!

Planetary head and grinding heads are set

to both turn in the same direction (i.e. both in

clockwise rotation or both in counter-clock-

wise rotation).

Clockwise rotation of speed control will in-

crease speed of planetary head and grinding

heads.

Control panel

What is what

Grinding satellite/ heads

Planetary head

Dust extraction port

English - 9

Setting up/Operation

Position grinder on the working area. Make sure there

are diamonds underneath machine and that the head

locks/shear pins are tight.

IMPORTANT!

When using the machine, each grinding

head must always have the same diamond

type and number of diamonds as the other

grinding heads. Each grinding head must

have diamonds the same height as the other

grinding heads.

Adjust rubber skirt so that a good seal is established

between the ﬂ oor and head of machine (see picture

below). Ensure join in skirt is at the front of the ma-

chine. Setting of the skirt is essential to obtain good

dust extraction and eliminate the possibility of airborne

dust when dry grinding.

Set handle to most comfortable working height using

adjustment lever.

IMPORTANT!

It is recommended that this height be set as

close as possible to the height of the opera-

tors hip bone.

When the machine is running, there will be a grind-

ing force/pull to one side that can be felt through the

handlebars. Use the hip to resist this force instead of

trying to control this through the arms (such positioning

will be much easier for the operator using the machine

over prolonged periods of time).

Powering up machine

i. Ensure the STOP/RUN switch is set on STOP

(rotate counter clockwise).

ii. Plug power supply to machine. Only turn power on

plug once fully connected.

iii. Disengage Emergency Stop button (twist clock-

wise).

iv. Depress Power button. On doing so, a soft “clunk”

should be heard to come from within the electrical cab-

inet. This indicates the line contactors have engaged,

supplying power to the drives/frequency converters.

Setting Speed and direction

On the control panel there is a FORWARD/REVERSE

and Speed dial knob. Generally, when starting the

machine for the ﬁ rst time on any given application, it is

advised the speed setting should not exceed 7, initially.

When the operator is comfortable with the application,

speed may be increased.

IMPORTANT!

It is important to note the following when

using the Husqvarna PG 530 single-phase

grinder:

Increasing the speed will also increase the

current being drawn by the machine.

If on some applications the machine is draw-

ing too much current and tripping current

limiting switches, the speed of the machine

must be reduced to compensate.

Low voltage supplies to the grinder may re-

sult in poor performance (reduced speed and

torque) of the machine.

Factors which may contribute to low voltage

supply to the machine include the following:

- Poor mains power supply (below 220V).

- Working off a generator.

- Using light duty power leads (power leads

with at least 2.5mm cores are highly recom-

mended).

- Using more than 20m (65ft) long power

lead.

Setting up/Operation

10 - English

Speed and direction setting is often a matter of per-

sonal choice. Operators are encouraged to experiment

to ﬁ nd which settings best suit the given applications.

The following table lists some suggested set-ups for

different applications.

APPLICATION DIRECTION SPEED

Ceramic tile adhesive removal FWD 6-7

Carpet glue removal FWD 5-7

Epoxy paint removal FWD 5-10

Rain damaged concrete FWD 7-10

Smoothen exposed aggregate FWD 7-8

Lippage removal in terrazzo / stone tiles FWD 5-7

Concrete polishing with resin bond pads FWD 10

PIRANHA™ scraper tool REV 3-5

FLEXOR™ ﬂ exible heads FWD 5-7

Bushhammer / Scarriﬁ er tools FWD 5

Re-grouting procedure during HiPERFLOOR™

process

FWD 5-8

Direction of rotation

The correlation between FWD/REV & Clockwise/Coun-

ter clockwise rotation can be said as follows if looking

at the grinding discs from underneath the machine:

1. REV—Clockwise.

2. FWD—Reverse.

As mentioned, when the machine is in operation it will

“pull” to one side. The direction of pull is determined by

the planetary head direction of rotation. The head of

the machine will pull to the right (and therefore, will be

felt on the right hip of the operator) when the planetary

head is set in the REVERSE direction.

This sideways pull can be very useful when grinding,

particularly along a wall. Set the machine so that it

pulls towards the wall, and then control the machine so

it can just touch the wall. This will ensure a grind close

to the wall wall or object.

Direction is also a matter of personal preference. It

should be noted, however, that when both grinding

discs and planetary heads are running in the same

direction, a more powerful grinding force is created be-

tween the diamonds abrasives and ﬂ oor being ground.

The end result ishigher productivity than when the

discs are set to run in opposite directions.

For this reason, the machine is set so that both the

grinding heads and planetary rotation are set in the

same direction.

Production tip - To improve the cutting efﬁ ciency of

diamonds, change directions on a regular basis. This

will work both sides of the diamond crystals, keeping

the abrasives as sharp as possible by creating maximal

exposure of the diamond crystal.

Once both speed and direction have been nominated,

switch on dust extraction or vacuum device.

IMPORTANT!

It is highly recommended to use the Husq-

varna DC 3300 dust extraction system for

complete dust control.

Standing behind machine with handlebars set as

described earlier, apply a small amount of downward

pressure on the handle. Switch the machine to run

mode using the STOP/RUN switch on the control

panel. The machine should start smoothly and acceler-

ate to the selected speed over a period of 5 seconds.

Setting up/Operation

English - 11

Changing the diamonds

As different applications require different selections of

diamond tools, there will be many occasions when the

grinding discs need to be changed.

Following is a guide for this procedure.

Preparation

1. Ensure STOP/RUN switch is in STOP position and

the power-plug disconnected as unintentional start-

ing of machine while changing discs can result in

serious injury.

2. Have a set of gloves ready, as diamonds can get

very hot during dry grinding applications.

Changing

1. Set handle in upright position (illustrated right).

2. Pull back on handle to lift grinding head off the

ground.

4. Lay machine back on the ground.

5. Put on gloves.

6. Remove grinding disc by slightly rotating disc and

then pull off (direction that the discs will need to be

rotated will depend on the direction the machine

was last running).

7. Check to ensure all head locks/shear pins are tight.

8. Once new diamonds have been attached, reverse

procedure to lower machine to ground.

9. As new diamonds may be a different height to set

being previously used, re-adjust skirt to ensure

good seal is established with the ﬂ oor.

Changing the diamonds

12 - English

Variable speed drives/

frequency converters

Each Husqvarna PG 530 is equipped with 1 variable

speed drive or frequency converter. This unit is incor-

porated into the machine for the following reasons:

1. Functional

• Manipulate incoming power to enable increase/

decrease in speed & direction change.

• Regulate current and voltage supply to the motors

to ensure motors run at optimum levels (e.g. torque

boost).

2. Protection/Diagnostic

Protection

• Monitors incoming power to ensure suitability for

machine and application being performed.

• Controls current being drawn by motors to ensure

motors are running within safe operational limits (to

prevent damage to motor).

• Monitors load on machine to ensure the grinder is

not being overloaded thus offering protection for

belt, bearings and other internal components.

• Protects motors from faulty power supply (e.g. run-

ning on 2 phases).

Diagnostic

• Identiﬁ es electrical faults with the machine and

registers fault code.

• Has monitoring menus that help isolate cause of

potential electrical faults.

• Monitoring menus also enable operator to gauge

how hard machine is working. Whilst it is not essen-

tial for an operator to intimately know every feature

of the variable speed drives or frequency convert-

ers, it is useful to be familiar with both the fault

codes as well as some of the monitoring menus.

Keypad/Display

Each variable speed drive or frequency converter has

a keypad which will appear as illustrated on the right

when the machine has power connected to it.

1. Run direction (fwd or rev)

2. Indicates if unit is either stopped or running

3. Up key

4. Reset button

5. Left key

6. Down key

7. Right key

8. Output mode (Hertz in this example)

9. Output value

Keypad display

Variable speed drives/frequency converters

5. 3.

English - 13

The menu tree illustrated on this page outlines the

important menu options that provide useful information

for monitoring and diagnostic purposes when using the

machine.

As can be seen on the menu tree to the right, when

the machine is turned on, the variable speed drives

or frequency converters are set to display the Output

Frequency to the motor (a zero value will register when

the machine is in stand-by mode).

It can also be seen that the Output Frequency page

falls under the Monitor Menu.

The left hand column, highlights that the two primary

menus important to the operator are the Monitor Menu

and Fault History menu.

Navigation through the menu tree is achieved by using

the up, down, left and right keys on the keypad (see

previous page).

Monitor screen Information provided

OUTPUT FREQUENCY Frequency motor is running at when machine is running.

REF. FREQUENCY Frequency speed control dial is set to.

MOTOR SPEED Speed of motor when machine is running.

MOTOR CURRENT Current draw of motor when machine is running.

MOTOR TORQUE Percentage of motor torque when machine is running.

MOTOR POWER Percentage of motor power when machine is running.

MOTOR VOLTAGE Percentage of motor voltage when machine is running.

DC LINK VOLTAGE Indicates quality of power supply.

Parameter Menu

Motor Power

Motor Voltage

DC Link Voltage

Motor Torque

Monitor Menu

Expanded Boards

System Menu

Faults History Menu

Active Faults Menu

Keypad

Control Menu

Output Frequency

Motor Speed

Motor Current

Variable speed drives/frequency converters

14 - English

Menus and information they provide

The following menu items/screens on the variable

speed drive/frequency converters provide the following

useful information to the operator.

OUTPUT FREQUENCY (Monitor Menu)

This screen tells the operator the frequency the motor

is running at when the machine is in operation. The

value for output frequency should be constant when

the machine is running. If there is a ﬂ uctuation in output

frequency when the machine is running, generally this

indicates the motor is running at or near the limit of its

programmed current limit. The current limits (predeter-

mined and set by Husqvarna Constructions Products)

are as follows:

1. Combined large and small motor - 16 amps.

If there is a ﬂ uctuation in output frequency when the

machine is in operation, it is advisable to check the

motor current as well. This can be found by pressing

the UP arrow on the keypad 3 times. For trouble free

operation concerning current issues, it is best to keep

output current at or around 12-13 amps. The current

draw of the motor can be reduced by reducing the

speed of the motor using the speed dial on the control

panel near the handle bars.

MOTOR CURRENT (Monitor Menu)

This screen displays the current draw of the corre-

sponding motors. See comments already covered un-

der OUTPUT FREQUENCY relating to motor current.

DC LINK VOLTAGE (Monitor Menu)

This screen displays the quality of the power supply

to the machine. It will read higher values when the

machine is in stand-by and lower values when the

machine is in operation. When DC LINK voltage is

reduced (in the case of a poor power supply), the vari-

able speed drive/frequency converter will draw more

current to compensate. This is why poor power supply

will lead to the machine drawing maximum current on a

premature basis (for further comments see page 11).

FAULT HISTORY

The fault history menu stores the last series of faults

experienced by the variable speed drive/frequency

converter. If there is a recurring fault pattern experi-

enced by the machine, the information can be obtained

from the fault history menu. For more on faults, see

trouble shooting faults.

Variable speed drives/frequency converters

English - 15

Faults and trouble shooting

When either one of the variable speed drives or frequency

converters in the machine experience a fault and “trip” out,

they will cease to run and an error message will appear

ﬂ ashing on the keypad display (see picture below).

The following list are the most commonly experienced faults

and possible action steps.

Fault Code Possible Cause Action

1—OVER CURRENT Motor being worked too hard and

drawing extra current.

Check current being drawn when machine is

running. Reduce speed setting and current draw

back into acceptable limits as described on

previous page.

Short circuit on output side of vari-

able speed drives or frequency con-

verters.

Check wiring in plugs connected to motor cables

or inside connection boxes on motors.

Motor failure (very rare) Have motor tested and replace if required.

Poor voltage supply to machine will

result in excess current draw

See comments on page 10

3—EARTH FAULT Short circuit on output side of vari-

able speed drives or frequency con-

verters.

Check wiring in plugs connected to motor cables

or inside connection boxes on motors.

Motor failure (very rare) Have motor tested and replace if required.

9—UNDER VOLTAGE Insufﬁ cient voltage supply to ma-

chine.

Check power supply and ensure correct voltage.

Power supply to variable speed

drives or frequency converters has

been turned off.

Re-connect power to grinder.

11—OUTPUT PHASE

SUPERVISION

Short circuit on output side of vari-

able speed drives or frequency con-

verters.

Check wiring in plugs connected to motor cables

or inside connection boxes on motors.

Motor failure (very rare) Have motor tested and replace if required.

14—UNIT OVER TEM-

PERATURE

Variable speed drives or frequency

converter over temperature due to

high temperature working environ-

ment or faulty temperature sensor.

Open door on electrical cabinet to increase ven-

tilation. Have variable speed drives or frequency

converter tested by service agent.

15—MOTOR STALLED Motor being worked too hard and

drawing extra current.

Check current being drawn when machine is

running. Reduce speed setting and current draw

back into acceptable limits as described on

previous page.

Mechanical jam preventing motor

from turning.

Try rotating grinding discs and planetary head by

hand to see if jam exists

16 - MOTOR OVER TEM-

PERATURE

Motor being worked too hard and

drawing extra current.

Check current being drawn when machine is

running. Reduce speed setting and current draw

back into acceptable limits as described on

previous page.

Fault code

Faults and trouble shooting

16 - English

Further problems that may be experienced when using the grinder and potential solutions are as follows:

Problem Possible Cause Potential Solution

GRINDER IS HARD TO HOLD

ONTO

Not enough diamonds under the machine

(if grinding thick glue or soft ﬂ oors, too

few diamonds under the machine will

greatly increase the load on grinder and

operator). Usually also accompanied by

high current draw by large motor.

Increase number of diamonds under machine

to reduce load on grinder and operator.

Large motor not working (this can be

caused by fault with motor, fault with wir-

ing to motor, or fault with large variable

speed drive or frequency converter).

Check large motor is plugged in. Check there

are no faults on larger variable speed drive or

frequency converter. Check that large vari-

able speed drive or frequency converter is

on. Check that large variable speed drive or

frequency converter is functioning properly

(unplug both motors, set display on keypad to

Output Frequency, switch machine to RUN,

see if numbers on screen change from zero

and begin counting up. If numbers stay on

zero, large variable speed drive or frequency

converter is not receiving run command from

switch on control panel. Machine needs to be

checked by an electrician or by Husqvarna

Construction Products.

Drive belt is slipping. Remove belt tensioner cover plate on bottom

of machine and check there is no water or dust

on the inside of the machine that may be caus-

ing the belt to slip on the drive pulleys.

Drive belt is broken (this can be con-

ﬁ rmed by turning one of the grinding

heads by hand. If all grinding heads rotate

together, belt is not broken. If only one

grinding head turns, belt is broken).

Replace internal drive belt.

GRINDER SOUNDS LIKE IT IS

OVER REVVING

Small planetary drive motor not plugged

in.

Check small planetary drive motor is plugged

in.

Small motor not working (this can be

caused by fault with motor, fault with

wiring to the motor, or fault with large vari-

able speed drive or frequency converter).

Check small motor is plugged in. Check there

are no faults on small variable speed drive or

frequency converter. Check that small vari-

able speed drive and frequency converter is

on. Check that small variable speed drive or

frequency converter is functioning properly

(unplug both motors, set display on keypad to

Output Frequency, switch machine to RUN,

see if numbers on screen change from zero

and begin counting up. If numbers stay on

zero, small variable speed drive or frequency

converter is not receiving run command from

switch on control panel. Machine needs to be

checked by an electrician or Husqvarna Con-

struction Products.

GRINDER IS JUMPING AROUND Grinding heads may be worn-out or

damaged.

Check grinding heads for broken parts or

excess movement.

Diamonds may not be ﬁ tted correctly or

different height diamonds may be on the

grinding heads.

Check to ensure all diamonds are ﬁ tted cor-

rectly and are the same height.

Head locks may be loose or missing. Check to ensure all head locks are present

and tight.

Faults and trouble shooting

English - 17

Diamonds

Background

Diamond abrasives usually consist of 2 components:

1. Diamond powder (also known as diamond crystals

or grit). By changing the size of the diamond powder

or grit, we can change how coarse or ﬁ ne the

scratches will be that are left behind from the

grinding process.

2. A binding agent (metal or resin). Diamond powder

is mixed and suspended in either a metal or resin

binding agent. When suspended in a metal binding

agent, the ﬁ nished product is referred to as a Metal

Bond or Sintered diamond segment. When sus-

pended

in a resin binding agent, the ﬁ nished product is

referred to as a Resin Bond diamond segment or

pad. By changing the hardness of the binding agent,

we can change how fast or slow the diamond abra-

sive

will wear.

General Principles

The following are general rules regarding diamond

segments in grinding applications. As with all general

rules there are exceptions or cases when it is not the

case.

DIAMOND GRIT SIZE

Changing the size of the diamond grit to a smaller par-

ticle/grit size will effect the performance of the diamond

tool in the following ways:

• Create a ﬁ ner scratch pattern.

• Increase the life of the diamond tool.

The opposite will occur when changing to a larger

particle /grit size.

BINDING AGENT—METAL BOND OR RESIN BOND

Increasing hardness of bond will:

• Increase life of diamond tool.

• Decrease production rate.

• Cause diamond tool to leave ﬁ ner scratches in dry

- grinding applications (when compared to a softer

bond diamond tool with the same diamond grit

size).

The opposite will occur when making the metal or resin

bond softer.

NUMBER OF DIAMOND SEGMENTS/PADS UNDER

THE MACHINE

Increasing the number of segments under the machine

will:

• Reduce pressure on each individual diamond seg-

ment.- Reduce wear rate on diamond segments.

• Reduce load on the machine and cause the grinder

to draw less current.

• Create a smoother scratch pattern (particularly on

soft ﬂ oors).

The opposite will occur when decreasing the number

of segments under the machine.

WET AND DRY GRINDING

When using diamond segments wet, the following

principles apply:

• Production rates will be higher than dry grinding.

• Diamond segments will wear faster (due to pres-

ence of slurry) and therefore, harder bonds can be

used (when comparing with dry grinding).

• Scratches from diamond grit will be deeper.

When using diamond segments dry, the following

principles apply:

• Production rates will be slower on harder materials

than if wet grinding.

• Softer bond segments will be required in order to

encourage segment wear (as there will be not slurry

to help diamond segments to wear).

• Scratches from diamond grit will not be as deep

compared to if it were also used for wet grinding.

• There will be more heat generated by the diamond

segment.

Summary of diamond principles

Diamond segments need to wear in order to achieve

productivity. Diamond segment wear can be inﬂ uenced

by the following factors:

• Pressure.

• Hardness of bond.

• Diamond grit size.

Diamonds

18 - English

Diamond selection

The following section covers important factors to

consider when selecting the diamond segment you are

going to use for a given application.

Grinding disc set-up

They way diamond segments are set-up on the grind-

ing heads of the machine will also greatly inﬂ uence the

performance of the machine, the productivity levels and

also the ﬁ nished ﬂ oor quality.

There are basically two types of diamond conﬁ gura-

tions that can be used when using the grinder:

1. Full set of diamonds – when there are diamonds

placed at each of the six positions on the diamond

holder discs (see pictures above).

2. Half set of diamonds – when there are diamonds

placed at three alternating positions on the diamond

holder discs (see pictures above).

• Presence of water.

• Number of segments under the machine.

• Adding an additional abrasive (e.g. sand, silicone

carbide) on the ﬂ oor will increase wear.

Generally speaking, the faster a diamond segment

wears, the faster the productivity will be.

By varying the above factors, changes can also be

made to effect the following:

• Scratch pattern.

• Current draw of machine.

• Flatness of ﬂ oor (see next section).

• Ease of operation.

Diamond Holder Disc

Position for Diamond segment

Full set of single segments

Full set of twin segments

Half set of single segments

Half set of twin segments

Diamond selection

English - 19

Full and half sets of diamonds

By changing the way the diamonds are set-up on the

diamond holder discs, an operator can signiﬁ cantly ef-

fect the performance of the machine and therefore, the

ﬁ nished product.

HALF-SET OF DIAMONDS

When the diamonds are set-up as a half-set, they tend

to follow the surface of the ﬂ oor. Similar to a tripod for a

camera, which can be placed on an uneven surface and

yet still ﬁ nd a stable footing.

The half-set diamond conﬁ guration should only be used

when a ﬂ at ﬂ oor ﬁ nish is not required.

FULL-SET OF DIAMONDS

When the diamonds are set-up as a full-set, they tend

not to follow the surface of the ﬂ oor. If the ﬂ oor has un-

dulations, the machine will grind the high areas yet miss

the low spots (unless the high areas are ground down

ﬁ rst).

The full-set diamond conﬁ guration should be used when

a ﬂ at ﬂ oor ﬁ nish is desired.

The below table gives some examples of possible ap-

plications for the two arrangements:

Application Full set is best Half set is best

Ceramic tile adhesive removal X

Carpet glue removal X

Epoxy paint removal X

Vinyl adhesive removal X

Rain damaged concrete X

Smoothen exposed aggregate X

Lippage removal in terrazzo/stone tiles X

Surface polishing of concrete ﬂ oors X

Grinding to expose aggregate in concrete polishing application X

Remove lippage from terrazzo/natural stone tiles X

Flatten undulations in concrete ﬂ oors X

Re-polish ﬂ oors that have been ground before X

Diamond selection

20 - English

Selecting the correct diamonds for your application

The following suggestions cover the basic principles for

diamond selection for different applications.

Application Metal

bond

Grit size Full-

set

Half

set

Singles /

Twins

Flatten ﬂ oor - Hard concrete SOFT 16 or 30 X S

Flatten ﬂ oor - Medium concrete MEDIUM 16 or 30 X S

Flatten ﬂ oor - Soft concrete HARD 16 or 30 X T

Ceramic tile adhesive removal HARD 6, 16 or 30 X S/T

Vinyl or Carpet glue removal - Hard concrete SOFT 16 or 30 X S/T

Vinyl or Carpet glue removal - Medium concrete MEDIUM 6 or 16 X T

Vinyl or Carpet glue removal - Soft concrete HARD 6 or 16 X T

Epoxy paint removal - Hard concrete SOFT 6, 16 or 30 X X S

Epoxy paint removal - Medium concrete MEDIUM 6, 16 or 30 X S

Epoxy paint removal - Soft concrete HARD 6, 16 or 30 X S/T

Rain damaged concrete HARD 16 or 30 X S/T

Smoothen exposed aggregate HARD 16 or 30 X S/T

Lippage removal in terrazzo - stone tiles SOFT 30 or 60 X S

Surface polishing of concrete ﬂ oors - Hard concrete SOFT 60 X S/T

Surface polishing of concrete ﬂ oors - Medium concrete MEDIUM 60 X S/T

Surface polishing of concrete ﬂ oors - Soft concrete HARD 60 X T

Grinding to exposed aggregate in concrete - Hard concrete SOFT 16 or 30 X S

Grinding to exposed aggregate in concrete - Medium con-

crete

MEDIUM 16 or 30 X S

Grinding to exposed aggregate in concrete - Soft concrete HARD 16 or 30 X T

Flatten undulation in concrete ﬂ oors - Hard concrete SOFT 16 or 30 X S

Flatten undulation in concrete ﬂ oors - Medium concrete MEDIUM 16 or 30 X S

Flatten undulation in concrete ﬂ oors - Soft concrete HARD 16 or 30 X T

Diamond selection

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