Why Are Angle Grinders So Noisy? – Detailed Guide

Angle grinders are widely used in the metallurgical and panel beating industries. These grinders are fitted with Arbortech discs and are used for carving wood. The tool is equipped with a variety of accessories, including wire wheels, polishing pads, and sanding discs. Since 1984, every angle grinder has exceeded the sound levels of 90 dB(A), demanding the use of ear protectors.

In general, sound levels below 70 dBA are considered safe. However, according to researchers, listening to sounds at or above 85 dBA for a long period of time can significantly increase the risk of permanent hearing loss. The aim of this article is to identify the causes of noise and vibration produced by portable grinders and the tips to reduce them.

Why Are Angle Grinders So Noisy?

Why Are Angle Grinders So Noisy

There are many reasons that can cause angle grinders to produce so much noise. Firstly, a worn-out bearing or broken gears with missing teeth can make sounds like rumbling, growling, grinding, or growling. Secondly, in addition to being dangerous, a worn or irregularly shaped disc makes more noise than one in a good state.

Furthermore, the high-speed spinning wheel on the grounded material produces the grinding force. The grinding wheel and the metal being ground are both excited by this force, which can cause noise and vibration. Above all, another obvious source of noise from pneumatic grinders is the air discharge at the motor.

Moreover, the spindle of the grinder is present inside the spindle box assembly. To mount the grinding wheel, the spindle has a threaded end. A spindle that has been eroded away or damaged may no longer perform properly and may be out of alignment which results in noises coming from the spindle itself.

Angle Grinder Noise Reduction Tips

Employers are required to manage noise in accordance with the hierarchy of control measures described below:

1. Maintenance Guidelines

The amount of noise generated by machines can be significantly reduced with routine maintenance. Maintenance consists of:

  • Make sure that the brushes and bearings are functioning properly.
  • Check to see if the blade guard is firmly attached and not rattling.
  • Select the appropriate disc for the job.

2. Noise Management

  • Lessen the material’s vibration while it is being cut or ground by working near the work area.
  • Use the tool outdoors whenever possible, but be cautious of the noise it may cause in nearby locations.
  • To minimize reflected sound, cover surfaces near the grinding area with acoustic absorption materials or use perforated metal-faced fiberglass insulation.

3. Administrator Guide

  • For particular jobs, use alternative tools. Use a power hacksaw, guillotine, hand cutters, and portable reciprocating saws, for instance, for cutting metal.
  • Avoid applying too much force, especially when cutting sheet metal.
  • Keep your grinder at arm’s length from your ears. By doing this, noise exposure is reduced.

4. Use Alternative Options

  • Old, worn-out angle grinders should be replaced with “quieter or newer equipment.” For instance, when free running, 100 mm Angle Grinders’ noise levels might range from 95 to 100 dB. (A). This is based on factors including bearing wear, gearbox wear, and tool age. Some of the better tool makers can provide noise-level information on the tool’s performance.
  • Use bench grinders wherever necessary.

FAQs about Angle Grinders Noise

What is an angle grinder?

Angle Grinder is a machine having a rotating abrasive disc used for cutting, grinding, or polishing metal and other solids.

How loud is an angle grinder?

Angle grinders that are portable can make noises between 90 and 115 dB(A).

How can we maintain an angle grinder?

We must make sure that the brushes, bearings, and blade guard of a grinder are functioning properly. Moreover, selecting the appropriate disc for the job can help a lot in noise reduction.


To conclude, prior to implementing the control action described above, enterprises must make sure that each degree of the hierarchy is practically achievable. This means that employers should not simply apply hearing protectors to reduce noise without also implementing higher-level control measures. To effectively manage noise, it is frequently required to apply a mix of control techniques.

We participate in affiliate programs to help us fund MechanicsGear. Some of the links in this website are affiliate links, which means that if you purchase a product using our link, we will earn a small commission. Don’t worry! This comes at no additional cost to you, and we will never base our reviews on whether or not we earn a commission off of a product. With that said, if you find our review helpful and decide to purchase an item we review, we would be very appreciative if you use our links to do so. It will help us bring you more awesome content in the future!

Leave a Comment