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problem with the table saw motor. Please help!

CENTERMIN

Nov 12, 2022
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I have a table saw and just 2 days ago when I was running it and turned it off, it gave off this flash from the engine - something it never done before. I think the armature may be worn out and as such need a good clean but could it be anything else?
I am grateful for any and all advice on this. Thanks


 

Minder

Apr 24, 2015
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Appears to be something happened in the brush/commutator area, requires a strip down and inspection, especially if the comm cannot be easily inspected.
 

kellys_eye

Jun 25, 2010
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Such motors typically use carbon brushes and they do wear out (sometimes they get stuck in their housing and don't contact the commutator properly).

Since they are 'serviceable' parts they are your first port of call to be checked. I doubt you'll need to go further....
 

CENTERMIN

Nov 12, 2022
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Home come you happened to be filming it when it happened? :confused:
no it has happened for the last 3 days. It was a sudden thing. never seen it before.
I should add that I had a blade with 80 teeth and used it extensivley to cut some 2 by 8 with over the past few weeks. I have, I believe, pushed it beyond the limit - due to the blade situation. But the blade I got now has 40 teeth and tha t situation is fixed.
 

CENTERMIN

Nov 12, 2022
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Such motors typically use carbon brushes and they do wear out (sometimes they get stuck in their housing and don't contact the commutator properly).

Since they are 'serviceable' parts they are your first port of call to be checked. I doubt you'll need to go further....
I only hope so. I have seen some videos on the internet with guys cleaning commutator with sand paper p180 and I thought I may do the same but do you think it's a good idea?
 

CENTERMIN

Nov 12, 2022
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some more pictures of the motor
 

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Minder

Apr 24, 2015
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Sand paper its not a good idea, it can be inspected and cleaned, only when new brushes are fitted, you use something called a Com stick in order to bed them in.
The flash could indicate they are worn down with low pressure on the com.
The pic do not really show the motor itself.
 

CENTERMIN

Nov 12, 2022
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Sand paper its not a good idea, it can be inspected and cleaned, only when new brushes are fitted, you use something called a Com stick in order to bed them in.
The flash could indicate they are worn down with low pressure on the com.
The pic do not really show the motor itself.
no i could not open the motor itself as it was freezing cold and I am a lawyer by profession and wanted to consult someone more knowledgeable in the area/ subject. But I will open and come back with more pictures.
One question though, the flash at the end - is it bad for the motor? can I use it in the mean time? I want/ I need to use the saw but unsure wether I can do that with the flash going on.. .

Thank you!
 

Minder

Apr 24, 2015
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You could conceivably cause some further damage as it is quite the 'flash' that occurs.
I would prefer to inspect it further to prevent more damage.
 

CENTERMIN

Nov 12, 2022
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You could conceivably cause some further damage as it is quite the 'flash' that occurs.
I would prefer to inspect it further to prevent more damage.
ok. I'll open it up and snap a lot of more photos. I'll take care of it.
 

CENTERMIN

Nov 12, 2022
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Sand paper its not a good idea, it can be inspected and cleaned, only when new brushes are fitted, you use something called a Com stick in order to bed them in.
The flash could indicate they are worn down with low pressure on the com.
The pic do not really show the motor itself.
..and thank you!
 

Bluejets

Oct 5, 2014
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I'd tend to go with "cooked the guts out of it" given the "alternative blade" explanation.
Sort of assuming here that 80 tooth blade is larger diameter blade.
 

CENTERMIN

Nov 12, 2022
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I'd tend to go with "cooked the guts out of it" given the "alternative blade" explanation.
Sort of assuming here that 80 tooth blade is larger diameter blade.
well no it was the same kind of blade, same bore diameter, same kerf and same size. 250mm, 30mm and 2.7mm so.. it was just the teeth that was 40 instead of 80..

how do you mean cooked? Like motor overworked?
 

turgut kalfaoglu

Apr 10, 2015
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Maybe the motor capacitor is doing something funky? Anyway I would first check the brushes clean/replace them then see if it persists..
 

Bluejets

Oct 5, 2014
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Originally you said you used was 80, which , if same diameter, would be a finer blade and no problem normally.
It's a series motor so no cap as #15 quoted.
Still think you've cooked it ( burnt out field or armature or both).
 

ivak245

Jun 11, 2021
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Have a look at the commutator, the mica insulation in between the segments may be worn level with the commutator, resulting in the brushes skipping over the mica and sparking. The mica should be just below the commutator surface, so the brushes only ride on the comm. An old sawblade ground to a point makes a good undercutting tool, taking a small amount of mica out of the way.
 

CENTERMIN

Nov 12, 2022
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Originally you said you used was 80, which , if same diameter, would be a finer blade and no problem normally.
It's a series motor so no cap as #15 quoted.
Still think you've cooked it ( burnt out field or armature or both).

i am a newie here and definitely not a techie or an engine guy I am not follwing here..
What do you mean by "cooked" ? It does not sound I've done something good. How can I fix it? What do you mean coocked? it had originally 80 teeth saw blade and I used it to cut alot of heavy lumber, 2 by 8 and whatnots and then 3 days ago I got this flash and now I am running a 40 teeth blade. You think the engine is overworked?
 

CENTERMIN

Nov 12, 2022
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Maybe the motor capacitor is doing something funky? Anyway I would first check the brushes clean/replace them then see if it persists..
Has the capacitator anything to do with the power charge? Becasue a friend of mine told me that it could have some power surge at the end, when I am turning it off, and since there could be some dust in it - that's what causes the flash at the end.

Because the area I was working at was not well ventilated and as such dust particles (probably) got into the motor...
 

CENTERMIN

Nov 12, 2022
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Have a look at the commutator, the mica insulation in between the segments may be worn level with the commutator, resulting in the brushes skipping over the mica and sparking. The mica should be just below the commutator surface, so the brushes only ride on the comm. An old sawblade ground to a point makes a good undercutting tool, taking a small amount of mica out of the way.
well i think that's the first thing I am going to do. I thought sanding it with a fine grid paper p180 may do teh trick but some people advised against it and instead wanted me to use com stick, or rubber pen.. just scratch the surface of it. Important is to brush the surface of it and then vaccum it and put a lot of air into it - compressed air to make it clean and nice...
 
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