Why are 9 inch grinders banned in Australia? Note: 9 inch (230 mm) angle grinders have been banned on some work sites due to the increased risk of injury. The increased power and size of the unit will cause more severe kickback and gyroscopic effects (i.e. makes the grinder difficult to manoeuvre).
Why are 7" grinders replaced?
What are the problems with a disc grinder?
What happens when angle grinders kick back?
How many uses of a grinder is 1 finger?
Why are OH&S tools banned?
Can you use extension cords on battery grinders?
Is a sandbox banned?
See 2 more
About this website
What is a 9 inch angle grinder used for?
The 9" angle grinder is mainly used for polishing, cutting, deburring, finishing, and grinding. The 9 angle grinder has a powerful motor and large cutting and grinding area, allowing the user to make deep cuts and give rapid removal of material in stone or metal.
What size grinders can you get?
The two most common disc sizes are 4.5” (115mm) and 9” (230mm). Grinders with larger discs are particularly well suited to heavy-duty applications, whereas those with smaller discs are ideal for finer work.
What is the most common grinder size?
6. Fine Grind (espresso grind) The most common grind size you'll come across. When you buy pre-ground coffee, it's usually a fine grind size (unless otherwise stated).
What is the cutting depth of a 9 inch angle grinder?
3"For example a 4" grinder can go as deep as an inch and a 9" grinder can go as deep as 3" depending on the angle/ position. This grinder is very powerful, a bit heavy but that's to be expected for a unit this size.
What size disc does a 9 inch grinder take?
230mm150mm cutting disc (6 inches) 180mm cutting disc (7 inches) 230mm cutting disc (9 inches)
How the size of grinder is indicated?
The size of an angle grinder is measured by the diameter of the disc that is mounted onto the grinder. You also need to consider the power of the motor of the tool when evaluating an angle grinder's capabilities. This dimension also indicates the maximum disc diameter you can mount on the tool.
Does grind size affect coffee flavor?
Choosing the Right Grind Size In general, if you brew coffee that is ground too coarse, the coffee can be under-extracted (weak), and less flavorful. If your coffee is ground too fine, however, the coffee can be over-extracted and bitter. Small changes in grind size can drastically affect the taste of your final brew.
What does burr grinder mean?
A burr grinder, also called a burr mill, is made up of two revolving burrs in between which the coffee is ground. The beans are crushed between a moving grinder wheel and a non-moving surface.
What level should you grind coffee?
For pour over coffee, the best grind to use is a medium-coarse grind. A medium-coarse grind will be similar in size to a French press grind but less chunky and will feel slightly smoother. If you are using a cone-shaped pour over, then use a medium-fine coffee grind instead.
Can I cut concrete slabs with an angle grinder?
A 4.5-inch angle grinder can certainly cut through concrete up to 1 inch thick, but you might find the job is done more quickly and with greater precision if you use a 9-inch angle grinder. The size of the angle grinder is not the only thing to consider.
Can you cut paving slabs with an angle grinder?
You can hire an angle grinder from Speedy Services for cutting paving slabs, grinders are compact and lightweight which reduces operator fatigue. Their powerful design is ideal for cutting masonry and concrete making angle grinders an ideal choice for your DIY projects.
Can you grind concrete with an angle grinder?
An angle grinder can be used to level, smooth and polish concrete by grinding it down. They can also be used to remove paint and floor adhesives. To grind concrete with a angle grinder you need a diamond cup wheel, a dust shroud attachment, and a vacuum cleaner.
What is the difference between 115 and 125 grinder?
All in all, 125mm angle grinders are extremely versatile tools despite their limited cutting depth of just 38 mm. While 115mm angle grinders offer a maximum cutting depth of only 30 mm, they are precise, easy to handle and lighter than larger versions.
How deep will a 4.5 inch grinder cut?
A 4.5-inch angle grinder can certainly cut through concrete up to 1 inch thick, but you might find the job is done more quickly and with greater precision if you use a 9-inch angle grinder. The size of the angle grinder is not the only thing to consider. An angle grinder's motor amps determine its cutting speed.
Do grinders fit true to size?
Note well: Grinders run a full size big and a bit on the wide side, so even though I wear orthotics and wool hiking socks, they still feel big. In comparison, current Docs run the same, but Gripfast boots seem to run true to size.
Does the size of a grinder matter?
One of the most important aspects to take into account before you purchase your grinder is the grinder's size, size does matter. Before you even start to compare different grinder sizes you need to think of the uses you're planning to give to your grinder.
Why are angle grinders banned?
Caution: 9 inch (230 mm) angle grinders have been banned on some work sites due to the increased risk of injury. The increased power and size of the unit will cause more severe kickback ...
How to keep a grinder from kicking?
never bump the grinder onto the object, or let the disc hit any other object while grinding. keep the grinding disc at a 15 to 30-degree angle to the object.
What is the correct flange and locking nut for a disc grinder?
the correct flange and locking nut is in place for the type of disc being used (otherwise the disc can shatter at high speed) the tightening tool supplied by the grinder manufacturer is used to tighten the disc as other methods can damage the disc and grinder.
When using a grinder fitted with a cutting disc, what should you do?
when using a grinder fitted with a cutting disc, keep the depth of cut to no more than double the disc thickness and avoid plunging the disc too far through the work piece. provide operators with training and instruction in safe work procedures for angle grinders.
What is a dead man switch on a grinder?
choose a grinder that has an automatic cut-off or dead-man switch as part of the handgrip. This is designed to cut off power as soon as finger pressure is released. Automatic cut-off switches may not be available on smaller models and may not be practicable for certain tasks.
How many hands do you need to operate a grinder?
use two hands to operate the grinder. One hand should grip the handle and dead-man switch (if provided), while the other hand supports the weight of the tool
Why do welders use screens?
use welding screens to stop other workers being hit by flying particles and sparks
Why are 9 inch angle grinders banned?
Note: 9 inch (230 mm) angle grinders have been banned on some work sites due to the increased risk of injury. The increased power and size of the unit will cause more severe kickback and gyroscopic effects (i.e. makes the grinder difficult to manoeuvre). A risk assessment to identify alternative methods and tools should be carried out prior to selecting a 9 inch (230 mm) angle grinder.
How did the angle grinder kill the worker?
The worker was killed when part of a broken disc struck the worker's chest. It appears that due to the high impact of the projectile it caused fatal internal injuries. In another incident the disc jammed and the angle grinder kicked back and cut the worker's wrist.
How fast can a 14 inch cut off disc be cut?
Fitting a 14 inch (356 mm) cut-off disc to a 9 inch (230 mm) angle grinder will increase the edge speed excessively to at least 120 m/s (430 kmph). Photograph 1 shows an angle grinder with the wrong size cutting disc fitted and the guard removed. Discs are not designed for the higher speed, and if used, risk the possibility of the disc shattering and striking the user and others.
What size disc is used for angle grinder?
In some cases the guards have been removed and the grinder fitted with a 14 inch (356 mm) cut-off disc.
Why is my angle grinder causing a disc failure?
Another factor that increases the risk of disc failure is when the central disc hole size is too large for the spindle flange on the angle grinder. As the disc diameter increases so will the hole ...
How fast is a cutting disc?
Cutting discs are usually designed for a maximum outside edge speed (i.e. peripheral speed) of approximately 70 metres/second (250 kmph). Larger angle grinders are manufactured with lower revolutions per minute (RPM) speeds than smaller angle grinders, so that the edge speed of the disc always remains around 70 m/s.
What is the purpose of the safety alert on angle grinders?
The purpose of this safety alert is to highlight the risks associated with removing guards and using incorrect discs on angle grinders.
Why are 9 inch grinders banned?
9 inch grinders have been banned from a number of work sites due to the increased risk of injury. In the majority of catastrophic injuries and fatalities involving 9 inch grinders, the level of risk was significantly increased because workers have removed guards and/or used incorrect discs.
What happens if you increase the power of a grinder?
The increased power and size of the unit will cause more severe kickback and gyroscopic effects (i.e. makes the grinder difficult to manoeuvre ).
What are the requirements for angle grinder safety?
The basic requirements for angle grinder safety at the workplace include providing: information and training, including the manufacturer’s safety instructions, to all workers who will use angle grinders. safe work procedures specific to tasks to all operators. one-on-one supervision for people being trained and those who are unfamiliar with ...
What are the safe work procedures for angle grinders?
Safe work procedures should include avoiding, where practicable, the use of angle grinders for cutting. The employer must provide safe procedures for angle grinder task and every employee who will use an angle grinder must receive training and instruction in these.
What is the most dangerous tool in the workplace?
Angle grinders. Angle grinders are one of the most dangerous tools in any workplace. They are used for cutting, grinding and polishing work. Most angle grinder injuries are from metal particles lodging in the operator’s eye.
What angle should a grinding disc be?
keep the grinding disc at a 15 to 30 degree angle to the work?
How many hands are used to operate an angle grinder?
two hands are always used to operate an angle grinder? One hand should grip the handle and ‘deadman’ switch while the other supports the weight of the tool.
Do you need an angle grinder for cutting?
Employers should provide purpose-designed cutting tools, for example drop saws, for materials like concrete, masonry, metal, ceramics, stone or plastic, so that there is no need for an employee to use an angle grinder for cutting. Employees required to use angle grinders must be fully informed of the hazards, ...
Do angle grinders expose the hirers to hazards?
People who supply angle grinders for hire should ensure that, as far as practicable, the tools do not, when used properly, expose the hirers to hazards. Hirers have an obligation under the Occupational Safety and Health Act 1984 to take all reasonable steps to ensure appropriate information about the safe use of angle grinders is available.
Why are 9 inch angle grinders banned?
Note: 9 inch (230 mm) angle grinders have been banned on some work sites due to the increased risk of injury. The increased power and size of the unit will cause more severe kickback and gyroscopic effects (i.e. makes the grinder difficult to manoeuvre). A risk assessment to identify alternative methods and tools should be carried out prior to selecting a 9 inch (230 mm) angle grinder.
What is the purpose of the safety alert on angle grinders?
The purpose of this safety alert is to highlight the risks associated with removing guards and using incorrect discs on angle grinders.
How fast can a 14 inch cut off disc be?
Fitting a 14 inch (356 mm) cut-off disc to a 9 inch (230 mm) angle grinder will increase the edge speed excessively to at least 120 m/s (430 kmph). Photograph 1 shows an angle grinder with the wrong size cutting disc fitted and the guard removed. Larger discs are not designed for the higher speed of smaller grinders and if used, risk the disc shattering and striking the user and others.
Why is my angle grinder causing a disc failure?
Another factor that increases the risk of disc failure is when the central disc hole size is too large for the spindle flange on the angle grinder. As the disc diameter increases so will the hole ...
How to tighten a disc grinder?
Use the tightening tool supplied by the grinder manufacturer to tighten the disc. Using another device (i.e. punch and hammer) can damage the disc and grinder.
What happens when angle grinders kick back?
Many other workers have been seriously injured when angle grinders have kicked back, causing cuts and lacerations.
When should guards be provided?
Guards should be provided and used on all power tools where there is a risk of the disc ejecting, disintegrating or cutting the worker. If the guard has been removed:
Why are 7" grinders replaced?
They are replaced with a 7″ grinder for safety sake BUT it is to understood that the same problems exist and it takes a lot of skill to handle a grinder
What are the problems with a disc grinder?
the problems are the mass of the disc on a sudden start up will rip the grinder out of the operators hands
What happens when angle grinders kick back?
Many other workers have been seriously injured when angle grinders have kicked back, causing cuts and lacerations. - Guards and discs on angle grinders
How many uses of a grinder is 1 finger?
In finger counting it is still the same, 1 finger every six hundred uses of a grinder
Why are OH&S tools banned?
They’ve been banned on a few of Australia’s highly OH&S conscious work sites because they have been linked to an increased level of injuries in comparison to other similar tools.
Can you use extension cords on battery grinders?
Building sites and individual employers have their own rules about what can and cannot be used. In many places “Battery Tools” are required and extension power cords are not to be used. I worked in a mechanical workshop in my earlier years and all power tools were “Air” operated for the obvious safety reasons. As far as I know Battery Grinders are around 5 inch or 125mm or mine is anyway.
Is a sandbox banned?
They are not banned. In many industries they are restricted and need authorisation to be used and can only be used by people who have their skills verified.
Risk Control Measures
- consider whether an angle grinder is actually the best tool to perform the task, because another tool may be just as, or even more, effective
- when purchasing a grinder, choose one with adjustable handles that can be moved to suit both left and right-handed operators
- choose a grinder that has an automatic cut-off or dead-man switch as part of the handgrip. T…
- consider whether an angle grinder is actually the best tool to perform the task, because another tool may be just as, or even more, effective
- when purchasing a grinder, choose one with adjustable handles that can be moved to suit both left and right-handed operators
- choose a grinder that has an automatic cut-off or dead-man switch as part of the handgrip. This is designed to cut off power as soon as finger pressure is released. Automatic cut-off switches may n...
- do not use a grinder that is larger, heavier or more powerful than is necessary, as it is much easier to control a lighter tool
Before Use
- Before using an angle grinder, ensure that: 1. the guard and handles are secure 2. there are no defects or damage to the disc (a disc which has been dropped may have developed cracks and should not be used) 3. the correct flange and locking nut is in place for the type of disc being used (otherwise the disc can shatter at high speed) 4. the tightening tool supplied by the grinder man…
During Use
- Follow these suggested safe practices when an angle grinder is in use: 1. use two hands to operate the grinder. One hand should grip the handle and dead-man switch (if provided), while the other hand supports the weight of the tool 2. allow the grinder to ‘run up’ to operating speed before applying it to the job 3. hold the grinder against the work...
Personal Protective Equipment
- It is recommended that you use appropriate Personal Protective Equipmentincluding: 1. wide vision goggles, safety glasses or a face shield 2. ear muffs or ear plugs 3. safety boots with steel toecaps 4. overalls or other fitted clothing 5. well-fitted gloves that allow a good grip of the tool.