Why is My Circular Saw Making a Noise (Grinding, Screeching & Rattling)?

Why is the table circular making a grinding noise?

Your table circular is making a grinding noise because of the inner friction of the universal motor or a damaged belt drive that can’t work smoothly again. A damaged blade is another reason your circular is making a grinding noise.


circular saw making noise


Inner friction of the universal motor

The reason that universal motors are referred to as regarded be “universal” is that they can be powered by either alternating current (AC) or direct current (DC). Brush-type universal motors are typically seen in circular saws.

In addition to being used in vacuum cleaners and routers, universal motors are also found in electric drills. The brushes in these motors grate against the slotted armature, which causes the table circular to make such a grinding noise.


Damaged belt drive

If the drive belt on your circular saw breaks, the blade won’t turn properly, and the saw will keep making grinding noise. The drive belt can be made of rubber or any other material and consists of a loop that links the motor to the blade. When you switch on the circular, it will spin the blade by passing it across the belt. Belts damaged or cracked will eventually slip or come off, and the blade will be unable to turn.

You can remove the drive belt and inspect it for signs of wear or damage if you believe it may be damaged. The damage may be readily apparent in certain circumstances, while it may lie concealed beneath the housing in others.

Before using the saw again, you must repair the belt if you discover any damage to it.


Damaged blade

If the blade of your circular saw is damaged, cracked, or bent, your circular saw will be making a grinding noise continuously. If the blade is damaged in any way, regardless of whether or not it still functions well, you need to get rid of the old blade and get a new one.

Additionally, if the blade is deformed, it may become caught in the workpiece and compressed. Whatever the case, an old blade that is either damaged or deformed must be changed at some point. Circular saw safety relies on several different factors, one of the most significant of which is having a good blade of the appropriate type.


How to fix a circular saw that is making a grinding noise?

You can fix your circular saw making a grinding noise by replacing the gear coupling set, using engineering control or administrative control. Maintenance of your circular saw can also fix your circular saw that is making grinding noise.

Replacing the gear coupling set

Now, the one and only question that arises is how to change the gear coupling set on the circular saw. The detailed steps of the technique are presented in the following walkthrough.

  1. Carefully remove the blade by first removing the main screw that is attached to the blade and is located in the center of the blade. First, remove the blade from the saw, and then remove the blade guard by moving the base clamp lever in the opposite direction.
  2. Then, take apart the assembly that holds the oil fill nut and bolt, and then empty the gearbox of its oil. Take the protective plate off the saw and set it aside.
  3. Take off the cap that’s on the front of the box. Now put the spindle lock into its engaged position and unscrew the nut at the armature shaft’s end.
  4. Now unscrew the nuts protecting the brushes on either side of the motor, and remove the brushes from the motor. Due to the delicate nature of the material, the brushes should be stored in a secure location.
  5. By removing the four bolts that hold the gearbox to the motor half, you can remove the back half of the gearbox. Now take the saw off the back part of the electric drive that it was attached to.
  6. Tap it out by striking the end of the armature shaft with any hard object in a light and gentle manner.
  7. With the assistance of the screwdriver, remove the base of the saw. Now that the spindle has been removed, insert the tip of the screwdriver below it and carefully pry it out.
  8. You will need to remove the access cover of the gearbox, take the bearings out of the housing, inspect them, and then either replace them or put them back in the housing and tap on them until they are properly seated. If the bearings can still be used, you will need to put them back in the housing and tap on them until they are properly seated.
  9. When inserting the spindle into the bearings, ensure the side of the spindle with the shorter grooves is facing the motor.
  10. Install the new gear and spindle into the housing, keeping in mind that the two distinct sides of the flange need to be placed downwards concerning the housing.
  11. After you have put your saw back together exactly as it was before, add some lubricating oil to the gearbox, and then your saw will be ready to use.


The gearbox may experience premature wear and tear as a result of kickbacks. You can take preventative action to forestall the need for immediate gearbox replacement in the future.

Because it is the central location where most of the saw’s workload is concentrated, this particular part of the circular saw has the highest lubricating requirement. You should prevent kickbacks since this will help the saw run more quietly and smoothly.


Using engineering control

Engineering controls will make your circular saw run smoothly without annoying grinding noise. Here are steps to follow:

  1. Complete or partial acoustic enclosures
  2. Barricades, walls, or screens to protect employees working in the area
  3. Vibration-reducing dampening collars that can be added to existing blades
  4. The installation of isolation mounts and the placement of the saw on a stable platform surface, such as concrete
  5. Putting a rubber pad under saws that are mounted on a bench, such as portable cut-off saws, to reduce the amount of vibration produced by the bench securing the saw to the table with nuts and bolts so that there are no vibrations minimized
  6. Using foam as the insulating material between the protecting panels on pendulum crosscut saws
  7. Reducing the spaces between panels, dampening or isolating them, and lining them by equipping beam saws with materials that attenuate sound
  8. Using cushioned clamps that are manipulated either manually or pneumatically both above and below the point of severance
  9. Coating the bottom of the feed table with mineral wool or foam.


Using administrative control

Administrative control is another method to keep your circular saw away from grinding noise. Follow these steps to perform administrative control.

  1. Do not idle the saw for any longer than necessary.
  2. Reducing the speed at which you are operating between 25 and 50 percent in rpm can potentially lessen the amount of noise produced by 6-8 dB(A), and 15 dB(A) in corresponding terms)
  3. Make sure any noisy cutting work is scheduled when the area contains the fewest number of employees overall.
  4. Switch up your work schedule to cut down on employee turnover.
  5. Ensure personnel do not use excessive pressure while cutting
  6. Maintain cut depth to a minimum
  7. Store saws in a different room or in a location that is not easily accessible to reduce the risk of infection to other staff members –


Maintenance of circular saw

Upkeep is absolutely essential to the prevention of circular saw grinding noise. Therefore:

  1. Maintaining blades sharp decreases the noise of up to 10 decibels (A).
  2. Adjust any loose parts (e.g., belts, blade coverings) to guarantee they do not shake or tremble.
  3. Ensure that saws, together with the motors, are kept in good condition through consistently scheduled maintenance and the replacement of bearings, brushes, and belts are all examples.
  4. By twisting the main shaft, check for wear on the bearings that support the main shaft blade from side to side.


Why is the table circular making a screeching noise?

Your table circular is making a screeching noise because the gear under your saw lacks lubrication or a dirty gear is causing an unnecessary screeching noise because of debris. Lack of maintenance of your table circular is another reason it makes a screeching noise.


Lack of lubrication

That screeching sound has the potential to drive you insane! It is obvious that the gears underneath your saw need to be lubricated at this point. You can now hear the bare steel of the worm gears scraping against the bare cast iron of the tilting trunnion and the rising gear since the original lubricant has either hardened or worn off.

It is not expected that the gears will wear down in this manner, so there is no reason to be alarmed about it, but the noise will continue to get louder.


A dirty gear

When your gear is full of dirt and debris, your circular table will make a screeching noise. You will have to remove all the strange substances If you don’t want to be hearing the noise again.


Poor maintenance

The most significant amount of screeching noise is produced by motors that are either out of balance or bear low-grade bearings. Lubricating the bearings is one way to reduce the amount of wear and tear and the vibration they experience. You must ensure that your circular saw’s powertrain is properly maintained.


How to fix a circular saw that is making a screeching noise?

You can fix your circular saw that is making a screeching noise by lubricating your gear, cleaning your gear, and using noise barriers.

Lubricating your gear

Lubricating your gear will go a long way to reduce the screeching noise from your circular saw. Below are steps to lubricate your gear:

  1. Apply lithium grease to the gears, the same kind of lubricant used in the manufacturing process.
  2. A lifetime supply can be purchased at an auto supply store for the price of six dollars for a one-pound tub.
  3. You can also use powdered graphite purchased from a hardware store or a company specializing in locksmithing for around $2 per tube.
  4. One advantage is that it will not draw dust and chips to the surface, unlike oil.


Cleaning your gear

You need to clean dirt and debris off your circular saw. This will stop it from making a screeching noise. Follow these steps to clean dirt.

  1. To clean the gears, use WD-40, which helps loosen the grease, along with an old toothbrush or a small brass brush.
  2. The teeth of the raising gear and the trunnion should each have a very thin layer of fresh grease.
  3. After giving the handles a few turns to turn, the oil will be transferred to the worm gears, and then you can sit back and enjoy the sound of silence.


Use of noise barriers

Noise Barriers offer a range of options for addressing the issue of excessive screeching noise caused by rotating blades. With the help of these noise blankets, you will be able to reduce the noise to 26 dB, which is more than sufficient to meet the requirements set forth by the EPA while also maintaining your ability to be active and productive.

These noise barriers can be moved from place to place, making it much simpler for you to utilize them. When a barrier is placed in front of noise, the sound will respond in three distinct ways. This is highly contingent on the material that the barrier is composed of, as well as the nature and intensity of the noise.

  1. The noise travels along the surface of the barrier before being reflected back in the direction from which it originated. OR,
  2. It ends up getting ingested by the barrier. OR,
  3. On the other side of the barrier, the sound can be picked up after it has broken through (or gone around) it.


Why is a table circular making a rattling noise?

The reason your table circular is making a rattling noise is because of a bolt is tightening down, or the washer isn’t placed over the spindle properly. A worn-out belt is another reason your table circular is making screeching rattling.

Utilizing a time-tested method from the world of auto mechanics can be one way to locate the source of the issue. While the machine is operating, position the end of a metal rod or extremely long screwdriver so that its tip is against the component of the machine that you believe to be producing the noise, and then position your ear against the opposite end of the rod.

Because sound travels up the screwdriver’s shaft, you may figure out where the sound is coming from by pressing the screwdriver’s tip against the machine’s various components. Again, a very long screwdriver is recommended for this purpose, as you do not want to risk getting your head caught in any of the moving parts.


How to fix a circular saw that is making a rattling noise?

You can fix your table circular, making a rattling noise by tightening your bolts properly, replacing your worn-out belt, and choosing the right saw blade.

Your work will be simplified if you select saw blades that produce the lowest possible noise. New saw blades provide minimal noise output without any loss in productivity or effectiveness; these are the greatest option for anyone who wants to limit the amount of rattling noise produced by saw blades when they are in operation.

Take the necessary precautions to protect your hearing by doing what you can. Also, always safeguard your hearing by wearing ear muffs or ear plugs whenever you are on the job site or operating your circular saw. Here are steps to fix your table circular’s rattling noise.

  1. Check to see if all your table saw’s parts are placed perfectly. If not, place them correctly.
  2. If any of your circular parts have worn out, replace them immediately.
  3. If, after ensuring everything is in place and still making a rattling noise, use a sound barrier.
  4. Use blades with a greater number of teeth, as these will typically come with more compact bullets, reducing the rattle noise.