When you’re attempting to cut wood, you might be wondering how to test table saw switch. The first step is to turn off the saw and any other electrical device connected to the circuit. If you have too many amps on the hot wire, you might have a problem with your motor or its switch.
Hopefully, you can solve this issue by following these easy steps. But if you aren’t sure, you can read this article to find out how to test table saw switch and get your machine back up and running in no time.
Check for continuity
When testing a table saw switch, you should always check the contacts for continuity. Faulty contacts may result in the saw not starting when pressed, or the switch may fail to provide continuity across its terminals.
Typically, a faulty switch contact is the result of corroded contacts or a fatiguing spring. To test the switch for continuity, push the switches’ contacts against their mating contacts. If there is no continuity across the switch contacts, they are dirty and need to be cleaned.
A multimeter is an excellent tool to use when testing a table saw switch, but if you don’t have a multimeter, you can also use a continuity tester.
A continuity tester is a small device powered by batteries, and features a probe on one end and an alligator clip on the other. When a circuit is completed, the tester should illuminate. You should also use a continuity tester when you’re troubleshooting a single-pole switch.
Check for burnt-out windings
If your table saw isn’t turning on, you might be looking at a faulty switch. In this case, it’s important to check all electrical connections, including the ground wire. The ground wire connects the saw’s case to the ground pin on the plug.
If this wire is open, the saw will run but without the safety protection that it should have. Replace it if necessary.
Another possible cause of a slow table saw is worn motor brushes. Although this doesn’t necessarily mean that the motor is defective, it does mean that it won’t start.
The carbon brushes in motor armature wear out over time. Replace them if you see any signs of a slow start. Alternatively, check the motor temperature to see if it’s running hotter than normal.
If you’re unsure if the motor is the problem, you can also check the power cord to see if it’s loose. If it doesn’t, check the thermal overload switch. If it doesn’t reset, the breaker may have tripped.
The switch is often tripped when the machine has been overworked, which could be a result of a dull blade or pushing the wood too hard. If the switch is still tripped, you should check the motor for any other problems.
If the resistance is too high, then the motor windings might have burned out. Check for continuity between the motor treminals and a VOM DMM. If the resistance is too high, then the motor is defective.
If the resistance is too high, then the motor won’t run properly. If you have a problem with the motor, contact the manufacturer and get a replacement.
Check for weared-out motor brushes
In some cases, the motor switch on a table saw may be defective. In such cases, the switch may be blown out or damaged, so you will need to replace the table saw motor.
Another reason why the switch may fail is overheating, which can cause the motor to overheat and eventually fail. The capacitor may also be faulty, resulting in a slow motor start.
Whether or not your table saw is operating slowly or if it is making a loud noise, it might be a sign that the motor’s brushes are damaged. This does not necessarily mean that the motor is broken, but it does mean that it isn’t running smoothly.
Brushes in an electric motor are made of carbon, which wears over time. You should replace your motor brushes regularly, as they can cause sparks and jamming.
Carbon brushes are held in place by screws on the commutator. To replace the carbon brushes, turn the motor upside-down and remove the brush holders.
Be sure to check for the right type of brush holder brackets, as these should have adequate drilling for them. Then, replace the worn-out brushes. If the motor is still working well, it may be a case of just one dirty brush or a broken brush.
If the motor brushes are too worn out, they could be a sign of an older motor. If you find that a motor brush is worn-out, replace it immediately. The replacement motor brush is inexpensive and can be replaced easily with the help of a table saw user’s manual.
There are several manufacturers that sell table saw parts for sale. However, if you don’t want to buy a new table saw, you can replace the motor brushes yourself.
If the problem isn’t with the switch itself, you should first check the power cord. Bad power cords can stop the tool in its tracks. A bad power cord can also result in increased off-and-on usage. You can evaluate the damage to the cord with a multimeter. Using a multimeter, you can find if any wire is damaged and should be replaced.
Check for worn-out motor brushes
To determine whether your table saw’s electric motor is in good condition, check the switches’ inductive circuit. If there are sparks, this could be the result of worn-out motor brushes. If you find them, replace them.
In addition, you should also check the commutator for depressions. If you can’t access the commutator, you can try checking the segments with your fingernail. If there is a depression between the segments, the brush may have lost contact with the blade.
Changing the table saw’s switch requires a little know-how, but it’s definitely worth it. Using a tool that can take a beating isn’t as expensive as buying a new table saw.
Check your manual for any information on replacing these brushes, or visit the manufacturer’s website for instructions. If you can’t locate them, you can purchase a replacement.
A carbon brush is the most common reason for motor failure. The leading-edge of a carbon brush is thinner than its trailing-edge. You can also test for worn-out motor brushes by using a continuity tester.
To test the brushes, remove the lead wires from the motor and insert the tester in them. The tester should light up or buzz when you touch the leads. Rotate the motor shaft to see if the tester is working properly.
If the tester does not light up or buzz, replace it. Another sign that your motor brushes are worn out is a stuttering or flickering motor. You should also check for damaged springs.
If your table saw fails to start, it is highly likely that its motor is the issue. Although worn-out motor brushes won’t make your table saw non-operational, they can cause your table saw to work slow.
If your machine is slow to start, it is likely that the motor is overheating. The motor may also be clogged with sawdust. Replace the brushes to resolve the problem.
If you can hear a banging sound when the tool is switched on, it could be a bad armature or motor brush. The brushes in the motor might be too worn and are jammed in their holders.
This will cause them to bounce off the commutator. This noise will not occur if the power switch is malfunctioning. Lastly, the motor brushes may have become entangled in the sleeve.
Frequently Asked Questions (FAQs)
1. What tools do I need to test a table saw switch?
To test a table saw switch, you will need a multimeter. To use the multimeter, first set it to the “resistance” or “ohm” setting. Then, touch the leads of the multimeter to the two terminals of the switch. If the switch is working properly, the multimeter should read “0” or “infinity.”
2. How do I connect the switch to the table saw?
To connect the switch to the table saw, you will need to use a power cord that has a three-pronged plug. The switch will need to be connected to the hot wire, and the table saw will need to be connected to the neutral wire.
Some tips on how to test a table saw switch include checking for continuity with a multimeter and testing the switch with the saw turned on to see if it turns the saw off and on as it should.