problem with the table saw motor. Please help!

[Gyro]

That saw certainly gives the motor some punishment when the brake cuts in! You can also hear it in the rate of decceleration.

One think I can say for sure, those brushes are badly worn. Using my rule of thumb, the length must always be significantly longer that the width. Those are much shorter, leading to the brushes tilting in the holders (you can see that from the end profile), whch also accelerates wear even more. You definitely need to replace them!

Hopefully with the increased contact pressure and stability of new brushes, things will look significantly better.

[centermin]

That saw certainly gives the motor some punishment when the brake cuts in! You can also hear it in the rate of decceleration.

One think I can say for sure, those brushes are badly worn. Using my rule of thumb, the length must always be significantly longer that the width. Those are much shorter, leading to the brushes tilting in the holders (you can see that from the end profile), whch also accelerates wear even more. You definitely need to replace them!

Hopefully with the increased contact pressure and stability of new brushes, things will look significantly better.

well what kind of brush should I buy? I've browsed the internet and there is plenty of different types of brushes and longer than width is nice rule of thumb but is there any other aspect I should keep in mind? Thanks

[Gyro]

If you can't find spare brushes directly from the manufacturer, try the user manual - imported stuff often has an exploded parts diagram with parts list.

If looking for generic replacements then the dimensions you need to measure are the brush width and thickness (these will determine the fit in the holders) and also a visual match of the brass plate that fits under the plastic screw cap. You will probably find that there are a only a couple of length options for the other dimensions, and you will probably be surprised by how much longer new ones are.  Motor brushes are fairly standard.

[andy3055]

I just saw the pictures of the brushes and I must say you just about saved that motor as they seem to be worn out at least 70%. They seem to be the little harder type with some sort of copper and carbon mix I have seen. Definitely not the carbon only brushes that are much softer.

[centermin]

I just saw the pictures of the brushes and I must say you just about saved that motor as they seem to be worn out at least 70%. They seem to be the little harder type with some sort of copper and carbon mix I have seen. Definitely not the carbon only brushes that are much softer.

So you think if i change the brushes then I'll be fine especially with respect to the flash at the end when i turn the motor off? If that's the case I am more than grateful!!!

[andy3055]

The reasoning is that shorter brushes make loose contact. Do you know what happens when you have loose contacts in an electrical circuit?
Also, if it was me, I would not use those brushes at this point. There is no better way to tell you that they need to be replaced. End of story!

[centermin]

The reasoning is that shorter brushes make loose contact. Do you know what happens when you have loose contacts in an electrical circuit?
Also, if it was me, I would not use those brushes at this point. There is no better way to tell you that they need to be replaced. End of story!

I really appreciate your candor as I, sometime, can be a bit senile and have hard time what's going on.

I will replace them and let you know what's what.
Thank you!

[james_s]

That saw certainly gives the motor some punishment when the brake cuts in! You can also hear it in the rate of decceleration.

One think I can say for sure, those brushes are badly worn. Using my rule of thumb, the length must always be significantly longer that the width. Those are much shorter, leading to the brushes tilting in the holders (you can see that from the end profile), whch also accelerates wear even more. You definitely need to replace them!

Hopefully with the increased contact pressure and stability of new brushes, things will look significantly better.

I think I would modify that by increasing the braking resistance, or just remove the braking entirely. The saws I've owned are all old enough to not have a brake to begin with, it's fine, just don't touch the blade.

[Gyro]

I wondered about that too, but I think it would be going past the OP's capabilities.

[CaptDon]

What do you mean "What kind of brushes should I replace them with"? For Christ sake get a set from the original equipment manufacturer. They should be readily available replacement parts. Brushes wear and are meant to be serviced. It's a law of nature. For something as simple as a commutator and a pair of brushes in a standard production saw......I haven't seen this much verbal banter since Trump claimed the election was stolen.

[centermin]

What do you mean "What kind of brushes should I replace them with"? For Christ sake get a set from the original equipment manufacturer. They should be readily available replacement parts. Brushes wear and are meant to be serviced. It's a law of nature. For something as simple as a commutator and a pair of brushes in a standard production saw......I haven't seen this much verbal banter since Trump claimed the election was stolen.

You're a funny man! Hahah.. My gf always tells me that I am stupid but she is more pointant and you Sir, are eloquent.