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slow-speed-grinder-rpm-quiz C Ear plugs. Slow speed grinder rpm quiz wheel hole diameter and the grinder arbor size are not the same. In order to make up for the reduced voltage, the motor will demand more amps. The wheel is not compatible with grnider grinder. They can quickly sharpen blunt tools. A and B. Why would you want to tap a grinding wheel with the non-metallic handle of a screwdriver?

The latest and most expensive bench grinders come with variable speed settings. But perhaps like me, you have an older model and would like to be able to lower the speed on your existing bench grinder, so that you can sharpen the blades of your tool collection more precisely.

How do you slow down a bench grinder? There are several effective ways of reducing the speed on a bench grinder, for example: controlling the router speed, fitting a belt pulley, using a variable frequency drive, reducing the wheel size and even building your own slow speed grinder.

In this article, I will discuss each of these different methods of slowing down your bench grinder and then you can decide which is the most suitable for your purposes. A bench grinder is a tool which spins grindstones, and these grindstones gently shape metal.

They can quickly sharpen blunt tools. Most bench grinders run at about 3, rpm, although there are more and more variable speed grinders on the market these days.

However, for sharpening blades, a low-speed grinder running at 1, rpm is a much better choice. A lower speed reduces the chance of the edge of your tool overheating. Slow speed grinders do still generate heat, but it happens at a more controllable pace that is ideal for work on delicate metals. This is what is required for sharpening work because the edges of cutting tools are very thin and can overheat easily. With a slow speed grinder and some practice you can learn to sharpen just about any cutting tool without ruining the hardness of the blades.

Slow speed grinders tend to cost a bit more because they need better motors. Slow motors need to have more power and torque to overcome lower inertia and possible stalling during the grinding process. If the motor on your bench grinder is under 1HP you should be able to control the speed with a router speed control.

My experience with this kind of set-up,however, is that when the speed is lowered, it loses its steady rhythm and jerks between 90 and RPM.

You can slow down your bench grinder by fitting a belt pulley in the place of the wheel. You can then fir a V belt to a secondary shaft with a larger pulley wheel. By running the motor through a variable rheostat control, you will reducing the voltage to the motor. In order to make up for the reduced voltage, the motor will demand more amps. This will cause the motor to run hotter. The correct way to do this is with a VFD variable frequency drive.

But because the machine was not adjusted correctly, the metal catches in the grinder. A split-second later, the grinding wheel explodes, sending stony chunks, as deadly as shrapnel, shooting through the shop. The worker drops lifeless to the floor. Tragic scenarios like that have been known to happen in workplaces across the country. An Occupational Safety and Health Administration OSHA examination of 27 grinder wheel accidents in an eight-year period revealed that 26 percent of those accidents resulted in employee deaths.

And those flying fragments can be deadly. This CD can help workers to improve safety and minimize risk by focusing on a personal protection system for pedestal and bench grinders.

Topics covered include personal protective equipment, grinder and grinding wheel RPM compatibility, ring tests, grinding wheel installation, guard adjustment, and aluminum oxide grinding wheels. SITE products use multimedia presentations which actively engage trainees in user-based interactions. A Grinder Safety Awareness Quiz How familiar are you with abrasive wheel grinders and their safe operation?

Take this quiz and find out. This quiz offers an answer selection for each question. Why should eye protection be used when operating a grinder?

Which of these are forms of personal protective equipment you may need while using a grinder? Why would you want to tap a grinding wheel with the non-metallic handle of a screwdriver?

When you need to put a new wheel on your grinder, what should you do with the wheel first? How much of a gap should there be between the work rest and the face of the grinding wheel? If your grinder requires repairs, what kind of replacement parts should you use? The wheel hole diameter and the grinder arbor size are not the same. What can you do to make the wheel workable? What kind of material can you grind with aluminum oxide grinding wheels?

How many wrong answers are permissible? In the workplace, it is zero. A knowledgeable worker is a happy, productive worker. We encourage you to read our updated Privacy Policy Hide. Toggle navigation Toggle search. Subscribe Today Reliable Plant Newsletters. To protect the eyes from ultraviolet rays created by the hot metal.

A and B. Eye protection. Ear plugs.

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