bench grinder safety rules

what are the safety rules when using a bench grinder?

Grinder Safety Work-Rests and Tongue-Guards OSHA specifies that work-rests be kept adjusted to within 1/8-inch of the wheel to prevent the workpiece from being jammed between the wheel and the rest, resulting in potential wheel breakage.

Also Know, what health and safety points do you need to consider when using the grinder? Always wear safety glasses, face shield, protective gloves, suitable protective clothing, hard hat, steel toe boots and hearing protection and dust mask if necessary. Keep other employees away while operating power tools. Always use proper guard with grinding wheel, it protects operator from broken wheel fragments.

Gloves should be worn only if using a tool grip of adequate length to keep hands several inches from the face of the stone. Do not wear gloves while holding small pieces or using a wire wheel. Keep long hair tied up, and do not wear loose clothing or loose jewelry when operating a grinder.

Essentially, bench grinders are just tools for spinning grindstones, and these grindstones are for gently shaping metal. They're commonly used for getting blunt tools back to full sharpness, but they're not a one-stop-shop for instantly putting an edge on a tool. When using a cutting blade, the edge gradually dulls.

osha bench grinder safety | legal beagle

The Occupational Safety and Health Administration (OSHA) is very specific about bench grinder safety. OSHA refers to bench grinders as Abrasive Wheel Equipment Grinders. The safety rules for this machinery are in the Code of Federal Regulations (CFR), and OSHA has a very detailed checklist for the bench grinder on its website.

There are four basic safety elements to the bench grinder that serve as guards or shields. The flange and spindle guard protect the worker from the spinning wheel. The eye shield is an optional protector for the worker who should be wearing eye protection. The adjustable tongue guard helps suppress flying debris and sparks. It should be no more than one-quarter inch from the wheel. The work rest is the point of operation. The worker should position the work piece on the rest so it touches the wheel from the front or edge. The rest should be one-eighth inch from the wheel.

Inspect the abrasive wheel before mounting it to the equipment. Check the wheel for any visual damage. If damaged, do not use it. Inspect the wheel for internal integrity; this is the "ring test." Tap the wheel "gently with a nonmetallic implement." You can use the handle of a screwdriver or a wooden or plastic mallet for thicker wheels. You should hear a ring. If the sound is more of a thud or dead sound, you likely have a faulty, unusable wheel. Further inspect to make sure the wheel's revolutions per minute (RPM) rating matches the RPM of the bench grinder.

Make sure the grinder is free from dirt and the area around it is free from clutter and debris. Workers need to ensure they have enough space for free movement during work. Securely mount the grinder to the work surface before starting grinding operations.

If the grinder has dust collectors or a powered exhaust, it must be in good working order. Check these before grinding operations begin. Ensure they are clear of clogs and debris that may hinder safe operation.

Check electrical and grounding connections on the grinder before turning it on. Check to see that the cords or connections are in good condition; free from splits, cuts, or other damage. Check to see if the grinder has an individual on/off switch. If there has been any bypassing of electrical components or safeguards, do not use the equipment until making repairs.

Make sure the abrasive wheel reaches its full RPM before engaging in abrasive work. Do not crowd the wheel to the point that it slows. Do not grind on the side of the wheel. Do all work on the face or edge near the rest. Make sure all eye equipment has no smudges or scratches blocking your view of the work. Do not wear loose clothing or other articles the wheel could catch, i.e., name badges, shirttails or sleeves, or jewelry. Make sure the area where you stand is dry. Consider using ear protection in addition to other personal protective equipment.

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bench and pedestal grinders | osha safety manuals

Almost every maintenance shop has a bench or pedestal grinder. They are most commonly used to shape or sharpen the cutting edges of tools such as chisels or lawn mower blades. These are powerful, useful tools, but they are also potentially dangerous because users take them for granted. Serious injury and even death can result from improper handling, installation or use of abrasive wheels. Cracked or defective grinding wheels can explode when in use.

Secure both pedestal and bench style grinders securely to the floor or work bench to prevent movement during usage. Store grinding wheels carefully on racks in dry places, and visually inspect them for warping, chips, cracks or other damage before installation. Discard used wheels once they are approximately 2/3 worn.

Do not stand directly in front of the grinder during start up, in case the wheel disintegrates as it reaches full speed. Allow the grinder to reach operating speed and then bring the item to be honed slowly and smoothly into contact with the wheel. Gradual application gives the wheel an opportunity to warm up and lessens the chance of breakage due to thermal stress.

Wheel disintegration can cause very serious injury due to the high speed of flying particles. Be sure your shop grinder is equipped with the proper safety features. One of next months Safety Meetings will explain how to perform the critically important Ring Test for grinding wheels.

grinder safety - the do's and don'ts - rockford systems, llc

Because grinders are everyday equipment in workplaces nationwide, many workers become complacent about their hazards. However, grinders are one of the most frequently cited machines during OSHA safety inspections. Rockford Systems, LLC, a premier provider of machine safeguarding products and services, offers this primer on grinder safety regulations to help prevent accidents and fatalities.

First off, it is important to be fully versed in the regulations that outline safe grinder installation, maintenance and operation. The workplace regulations that apply to grinders are OSHA 29 CFR SubPart O 1910.215, a machine specific (vertical) regulation with a number of requirements, which if left unchecked, are often cited by OSHA as violations. ANSI B11.9-2010 (Grinders) and ANSI B7.1 2000 (Abrasive Wheels) also apply. Carefully review these sets of regulations before operating any grinding machinery.

OSHA specifies that work-rests be kept adjusted to within 1/8-inch of the wheel to prevent the workpiece from being jammed between the wheel and the rest, resulting in potential wheel breakage. Because grinders run at such high RPM, wheels actually explode when they break, causing very serious injuries, blindness and even death. 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. Because the wheel wears down during use, both these dimensions must be regularly checked and adjusted.

Grinder safety gauges can be used during the installation, maintenance, and inspection of bench/pedestal grinders to ensure work-rests and tongue-guards comply with OSHAs 1910.215 regulation and ANSI standards. To do so, wait until the wheel has completely stopped and the grinder is properly locked out before using a grinder safety gauge. Grinder coast-down time takes several minutes, which may tempt an impatient employee to use the gauge while the wheel is still rotating. This practice is very dangerous because it can cause wheel breakage.

Other advice: where grinders are concerned, personal protective equipment (PPE) usually means a full face-shield, not just safety glasses. The fact is, an employee cannot be too careful with a machine that operates at several thousand RPM. Remember to document any safety requirements set forth by OSHA as that is the best evidence that safety procedures are being followed.

OSHA requires that grinding wheels be ring tested before mounting them. This simple step prevents the inadvertent mounting of a cracked grinding wheel. Ring-Testing involves suspending the grinding wheel by its center hole, then tapping the side of the wheel with a non-metallic object. This should produce a bell tone if the wheel is intact. A thud, or a cracked-plate sound, indicates a cracked wheel. For larger grinders, grinding wheels are laid flat on a vibration-table with sand evenly spread over the wheel. If the wheel is cracked, the sand moves away from the crack.

To prevent cracking a wheel during the mounting procedure, employees must be very carefully trained in those procedures. This starts with making sure the wheel is properly matched to that particular grinder, using proper blotters and spacers, and knowing exactly how much pressure to exert with a torque-wrench, just to mention a few things.

This OSHA-compliant Wheel-Cover allows no more than a total of 90 degrees of the wheel left exposed. (65 degrees from horizontal plane to the top of wheel-cover). Never exceed these wheel-cover maximum opening dimensions. Larger wheel-cover openings create a wider pattern of flying debris should the wheel explode.

A well-recognized safety precaution on bench/pedestal grinders is to stand well off to the side of the wheel for the first full minute before using the machine. Accidents have shown that grinding wheels are most likely to shatter/explode during that first minute. OSHA Instruction Standard #STD 1-12.8 October 30, 1978 addresses the conditional and temporary removal of the Work Rest for use only with larger piece parts based on the condition that Side Guards are provided.

This single-phase unit is designed for motors that have built-in over-loads. Typical applications for these combinations include smaller crimping machines, grinders, drill presses, and all types of saws. The 115-V, 15-A disconnect switch and non-reversing magnetic motor starter are housed in a NEMA-12 enclosure. Enclosure size is It includes a self-latching red emergency-stop palm button and a green motor control start push button. It can be used on machines with 115-V and is rated up to 1/2 HP maximum. The disconnect switch has a rotary operating handle which is lockable in the off position only. This meets OSHA and ANSI standards. For machines with 230-V AC single-phase motors, a transformer is required to reduce the control circuit voltage to 115-V AC in order to comply with NFPA 79.

Double-wheel bench grinder shields provide protection for both wheels of the grinder with one continuous shield. The durable shield is made of clear, -inch-thick polycarbonate and measures 18-inch x 6-inch. A special shield bracket adds stability to the top of the shield. The single-wheel bench grinder shield is made of clear, -inch-thick polycarbonate and measures 6-inch x 6-inch. This sturdy, impact-resistant shield is designed for use when a single wheel needs safeguarding. These shields have a direct-mount base that attaches directly to the grinder table or pedestal.

PROTECTOR Series Shields can include color-changing LED lighting nested into the frame of the shield to illuminate the work area during machine operation. The LED light strip is integrated into the shield frame and each strip packs 262 Lumens of light per linear foot. For example, the PROTECTOR 28 octagonal or circular shield provides 2180 Lumens, compared to a typical clip-on work lamp that provides only 800 Lumens. Operators will appreciate the non-reflective, true-color rendering white light illuminating their work area. When the shield is moved out of the safe work position, white LEDs switch off and red LEDs switch on, thereby providing visual indication that the shield is in the open position. All LED lighting has been manufactured to exacting IEC IP65 outdoor/wet location standards to withstand coolant and lubricant splashes.

PROTECTOR Series Shields can be upgraded with a safety-rated interlock switch or switches, dependent upon application. Interlocking shields exceed OSHA CFR 1910 regulations and ANSI B11 Series standards, and are considered a best safety practice. Shield interlocks shut off or disengage power and prevent machine start-up when guard is not closed, thereby increasing operator safety and preventing bypassing. All safety interlock switches are mounted in a tamper-resistant NEMA 4 housing, comply with the IEC/EN 60947 safety standard and carry IEC IP66/67 device ratings. Additional motor starter or anti-restart devices may be required when incorporating interlocking devices into the Protector Series Shields in order to ensure safe and compliant operation.

bench grinder risk assessments and safety | makesafe tools

A risk assessments for a pedestal or bench grinder always includes a core set of recognized hazards and requirements. The discussion below describes each hazard, points out the related OSHA requirements, and makes suggestions for remediation.

An emergency situation is when a machine operator is unexpectedly exposed to a hazardous condition that needs to be urgently avoided in order to prevent injury, reduce severity of any injuries in progress, and to avoid damage to the workpiece or machinery. Providing easy access to an emergency stopping device (or e-stop) can significantly improve an operators chances of avoiding injury and is required by OSHA for most machinery.

Industrial machines coast and continue to spin long after they have been turned off. This coasting (or "freewheeling") can last for minutes and puts machine operators at risk as they continue to work around the still-operating machinery.Learn More.

Automatic and unintentional restarts happen when power is lost while a machine is operating. The machine then starts itself when power is restored. This is a specialized case of hazardous energy control but one that is not solved with typical lock out tagout procedures. That is why OSHA, ANSI, NFPA, NEC, and CSA all explicitly require means to prevent the unintentional restarting of machinery. Learn More.

An under-rated, worn, damaged, or clogged grinding wheel can fracture and explode releasing tremendous amounts of energy in the form of shrapnel. This is a severe hazard and often results in operator fatality, which is why OSHA requires that wheels be inspected regularly. Learn More.

A nip point hazard is created whenever two adjacent parts of machinery move towards each other and have the potential to capture or draw-in foreign objects like body parts, loose clothing, or hair. These hazards are especially problematic because this type of motion tends to grab and pull an operator towards the hazard, thereby increase the severity of any incident. This is why OSHA has specific requirements for tool rests and guards on bench grinders. Learn More.

Contact with a grinding disc can quickly lead to abrasions, lacerations, and amputation. This hazard is especially significant on bench grinders due to how close an operator hands are to the disc during operations like tool sharpening.

Flying chips, sparks, parts of the grinding wheel, and other debris regularly exit bench grinders at high speeds and can cause irritation, burns, respiratory distress, and severe eye injury. This is why OSHA requires shields, eye protection, and sometimes even active dust collection.

The MAKESafe Power Tool Brake is a plug-and-play braking solution for grinders that also includes anti-restart and emergency stop. All you have to do is plug it in, perform a calibration that takes less than five minutes, and youve added multiple machine safeguards to your bench grinder. See a demonstration video and device specifications for more information.

should you wear gloves when using a bench grinder?

Should you wear gloves when using a bench grinder? It is always a very good idea to wear gloves when you are working around a bench grinder. Gloves keep your hands protected and safe from any possibleburns. The only thing to watch out for is not to get the gloves caught in the spinning wheels.

There are other reasons to wear gloves when working on a bench grinder other than protecting your hands against burns. Just continue to read our article to find out those reasons and some bench grinder safety rules.

Other workers have had their employers make it mandatory for all people using that bench grinder to wear gloves. One reason for this is that workers compensation claims can cost the company a lot of money and a lot of lost working time.

Hands can get injured at a bench grinder if you are not careful. Another reason to wear gloves while working at a bench grinder is that if they are strong enough, the gloves will cut down on the hand/arm vibration syndrome.

Finally, gloves should protect you from flying metal pieces. Grinding is not always a perfect job and small chunks of metal can be torn off and sent in the direction of your hands. Wearing gloves can protect your hands from the burns that come from these hot metals.

There are differences between work gloves. Each style has its own purpose and one does not automatically transfer from one risky job to another. Bench grinding has so many different elements that just any safety glove will not do.

As we mentioned earlier, there are those people who are very much opposed to using gloves when working on a bench grinder. Their main reason is that you could make the wrong move and the grinding wheel will catch the glove.

One workmans compensation board requires that if gloves are worn around a bench grinder, the material being ground needs to be long enough to keep your hands far away from the grinder. The distance between your hands and the grinder should be several inches.

As you can see some people like gloves when using a bench grinder and others do not. The reasons to wear them certainlyoutweigh the reasons you shouldnt. Even without gloves, you run the risk of having your hands get caught in the grinding wheel. Accidents dohappen.

A lot of employment companies are making it mandatory for you to wear gloves so you may not have a choice in the matter. But whether you do wear gloves or not, you still need to follow the safety rules and be careful.