Abrasive wheels used on bench and pedestal grinders must be equipped with safety guards. If the distance between the safety guard and the opening at the top of the wheel is greater than 1⁄4-inch, then an adjustable “tongue guard” to protect workers must be installed.
What is the purpose of a tongue guard on a bench grinder?
Tongue guards or spark arresters
Tongue guards are metal plates located at the upper part of the wheel opening of the bench grinder. These guards prevent pieces of the grinding wheel from harming nearby workers should the wheel shatter.
What is a grinder guard?
Product Description. Designed for use with cut-off discs or diamond blades on your angle grinder, this safety guard protects you from high speed cutting wheels. Built from solid sheet steel this angle grinder blade guard also minimizes the risk of injury if a cut-off disc should break during use.
Why do bench grinders have 2 wheels?
Bench grinders come with two wheels that can be used for multiple purposes. The first wheel is usually designed for fine sharpening and precision work, while the other wheel is used for rough shaping. These can be easily swapped out for different wheel configurations according to the user’s needs.
How far should the guard be on a bench grinder?
Grinder Safety – Work-Rests and Tongue-Guards
In addition, the distance between the grinding wheel and the adjustable tongue-guard — also known as a “spark arrestor” — must never exceed 1/4-inch.
Should you use gloves with angle grinder?
Operators should wear safety glasses, FR clothing, and gloves while using an angle grinder. Depending on the application, an operator might also require a face shield and a respirator.
Which type of guard is usually fitted to a grinding wheel?
Abrasive wheels used on bench and pedestal grinding machines must be equipped with safety guards. The safety guard encloses most of the wheel — covering the flange, spindle end, and nut projection — while allowing maximum exposure of the wheel periphery.
Why guards are used in grinding machine?
Grinding wheels must be guarded by appropriate protective guards on grinding machines. These guards must be capable catching broken wheel fragments effectively. Only that part of the wheel required for grinding may be left unprotected.
What is a Type 1 guard on an angle grinder?
Type 1 is for grinding, type 1a is for cutting. Type 27 is for grinding, type 27a if for cutting. Same rule applies, use the larger guard for the Type 27 wheels (Or depressed wheels) Use the smaller guard for type 1 wheels.
What should be avoided when grinding tools on the grinder?
Never use the grinder without wearing all the personal protective equipment and clothing such as goggles, helmets, masks, ear protection, gloves, leather aprons etc.
What does D mean on an abrasive wheel?
First letter = abrasive material. A= Aluminum Oxide (usually metal) S- Silicone Carbine (usually masonry) C- Ceramic. D- Diamond.
What is a ring test on a grinder?
Grinding wheels must be inspected and “ring-tested” before they are mounted to ensure that they are free from cracks or other defects. Wheels should be tapped gently with a light, nonmetallic instrument. A stable and undamaged wheel will give a clear metallic tone or “ring.”
What are the different types of guards?
There are four general types of guards:
- Fixed.
- Interlocked.
- Adjustable.
- Self-adjusting.
What are most angle grinder injuries from?
Most angle grinder injuries are from metal particles lodging in the operator’s eye. However, the most serious injuries are from kick-back, where the disc is thrust back violently towards the operator. Angle grinders used with cutting discs expose workers to a range of severe additional hazards.
Why do angle grinders kick back?
Kickback happens when the angle grinder grabs or jams on the material when cutting. Kickback can cause the user to lose control of the tool, and it can hit the worker or get dropped, causing foot and leg injuries. Kickback is more likely if you are using the wrong wheel or running at the wrong speed.
How fast does an angle grinder spin mph?
Angle grinders are tools that feature a head that spins at very high speeds. Generally speaking, anything that spins in a circle, in terms of speed, is measured in RPM or revolutions per minute. Angle grinders usually spin at speeds anywhere from 2,000 to 13,000 revolutions per minute.
How deep will a 9 inch grinder cut?
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.
Do you need training to use a grinder?
What is Abrasive Wheels training and who needs it? Abrasive Wheels training is a legal requirement for anyone operating this equipment in the workplace. Abrasive Wheels are extremely dangerous and the only way to reduce risk is through theoretical and practical training in operating the machinery.
Which area should be avoided when grinding with the portable disc grinder?
Never grind with the portable disc grinder in an area which houses flammable materials or combustible gases.
What is a Type 1 grinder wheel?
Type 1 Wheel – A thick disc shaped wheel intended for grinding on its periphery as in bench grinders or straight grinders.
What is the recommended gap between tool post and grinding wheel?
If you’re referring to a standard bench grinder such as used for sharpening various shop tools, I’d say between 1/8 inch and 3/16 inch or 3–4 mm. At anyy rate close enough that your piece of work cannot be pulled into the gap between the grinding wheel and tool rest.
What are the parts of an angle grinder?
11 Key Parts of an Angle Grinder
- The Power Lever. The first Parts of an Angle Grinder you must be aware of is the power switch or power lever.
- Lock Button. The second part of an angle grinder that you need to know about is the Lock Button.
- Dial for Speed Control.
- Main Handle.
- Side Handle.
- Body.
- Engine.
- Spindle.
What is a Type 27 guard?
Explanation: Type 27 & 28 guards are open on the bottom to allow for side grinding with raised hub/depressed center wheels. When side grinding with the Type 27 or Type 28 wheel, the work piece acts as a portion of the guard, protecting the operator in the event of a wheel breakage.
What is a Type 11 grinding wheel?
Type 11 Cut-Off and Grinding Wheels
Wheels are used with power tools and industrial machines such as angle grinders or bench grinders. Cup grinding wheels are used in applications such as smoothing welding seams and preparing surfaces for painting.
Why do bench grinders have 2 wheels?
Bench grinders come with two wheels that can be used for multiple purposes. The first wheel is usually designed for fine sharpening and precision work, while the other wheel is used for rough shaping. These can be easily swapped out for different wheel configurations according to the user’s needs.
Why do you stand to one side of the pedestal grinder during start up?
Stand to one side when starting a grinding machine. Damaged wheels will sometimes fly apart, and this is most likely to happen when the machine is being started. Stand to the side so that you will not be in-line with the debris.
How slow is a slow speed grinder?
Slow speed grinders are kinder and more forgiving to the workpiece. Tools of this sort operate at speeds of 1800 RPM, or even slower. These relatively slow RPMs generate heat too, but it happens at a more controllable pace that is ideal for work on delicate metals.
What is the best method for sharpening knives?
To sharpen your knives at home, you can use an electric sharpener or a whetstone (also called a sharpening stone). Electric sharpeners require little effort on your end, but stones are generally the preferred choice since they’re gentler on blades, relatively inexpensive, and easy to use.
What is a tormek?
Tormek T-1 Kitchen Knife Sharpener
A versatile wet sharpening system that is perfect for sharpening most types of edge tools. A versatile wet sharpening system that is perfect for sharpening most types of edge tools. Knife sharpening in the professional kitchen.
Does a bench grinder need to be bolted down OSHA?
OSHA standard 29 CFR 1910.212(b) requires machines designed for a fixed location to be securely anchored to prevent walking or moving. However, work benches or pedestals do not have to be secured when there is no fixed machinery mounted to the work surface that would create a movement hazard to the employees.
How far should the guard be on a bench grinder?
Grinder Safety – Work-Rests and Tongue-Guards
In addition, the distance between the grinding wheel and the adjustable tongue-guard — also known as a “spark arrestor” — must never exceed 1/4-inch.
What should you not do with an angle grinder?
Angle Grinder Use
Keep work area clear of debris and flammable materials. Do NOT use in areas where there is grain dust or other combustible dust accumulation. speed, and the work to be performed.
What does 38A mean grinding wheel?
When you see a Norton wheel with the markings 38A after the size, you are looking at a wheel that is good for Light Grinding of Tool Steels. Features of Norton 38A Wheels: * White, friable abrasive grain.
What should I wear when grinding metal?
Cover your skin with a fire retardant (FR) jacket or well-fitting, flame-resistant clothing to protect against burns and cuts from the spark stream or the surfaces of the workpiece. Do not wear loose clothing when operating a hand grinder. Tuck in your shirttail and keep sleeves buttoned.
Should you wear gloves while grinding?
Personal protective equipment, including safety eyewear and a faceshield, should be worn when operating a grinder. Hearing protection also may be required. Gloves should be worn only if using a tool grip of adequate length to keep hands several inches from the face of the stone.
What are the 3 factors for successful grinding?
Here are some key factors that can affect the results of surface grinding.
- Grinding Wheel Material. One main factor that can affect the results of surface grinding is the material used for the grinding wheel.
- Hardness and Dressing.
- Feed and Speed.
- Workpiece Material.
When should you replace a grinding wheel?
If you do not know, a good “rule of thumb” is to discard the wheel when you are 1” away from the recess. Portable cup wheels must be discarded when the machine’s guard prevents proper grinding. In this case a proper guard will determine discard size by preventing additional grinding on the wheel’s rim.
What are the 5 types of different guards commonly used?
Some guards also protect workers from shavings, flying shards or metal sparks created by working machines.
Types of Machine Guards
- Fixed guards.
- Interlocking guards.
- Adjustable guards.
- Self-adjusting guards.
What are the two main types of machine guarding?
Types of machine guarding
- Types of Guards and Selection:
- Fixed limited access guards provide a minimum opening in the guard to insert and remove the job (material).
- Fixed adjustable access guards provide an opening through or around the guard to accommodate materials of different sizes.
What are most angle grinder injuries from?
Most angle grinder injuries are from metal particles lodging in the operator’s eye. However, the most serious injuries are from kick-back, where the disc is thrust back violently towards the operator. Angle grinders used with cutting discs expose workers to a range of severe additional hazards.
Should you wear gloves with an angle grinder?
Best practices, PPE, and vigilance are the keys to injury prevention. Operators should wear safety glasses, FR clothing, and gloves while using an angle grinder. Depending on the application, an operator might also require a face shield and a respirator.