Cut motor brushes

[unitedcases]

Ummm...did I miss something? I just got a whole 14 hours out of these....

http://images.tapatalk-cdn.com/15/09/26/6292e1f99780b3162a1bb8932b56b76d.jpg

[DianMayfield]

According to my machine whisperer brother, only 3 things:

Inferior brush material
Overloaded motor
Motor going bad (lots of arcing)

We have CW whisperers on here, so I am sure they will chime in :)

I showed him my brushes, he thinks they look like Dewalts.. he's gonna check for me

[unitedcases]

I was already leaning toward a motor, and honestly may just change it out, as I have spares. But inferior brush material??? That doesnt sound quite kosher...

[DianMayfield]

Inferior materials - carbon mixture off?? He left so I cannot ask.

[unitedcases]

I knew what you meant. I changed the brushes on the fly and I can hear myself talk in a normal voice, I am pretty sure the motor is shot...

[Digitalwoodshop]

A close up picture of the Armature would be nice... Might be a scratch in the copper or a damaged section making it into a "Planer"....

A brush with too soft a mixture of carbon would cause it.... but I can't believe it could slip into the CW Supply chain...

I agree, change the motor... but open the old one for pictures then send as a core to LHR and get another..

Also check the rear motor bearing.

AL

Picture: 1000 hours and a new one.

[bergerud]

I bet you find a shorted armature winding. Look for a couple of commutator strips burnt.

[unitedcases]

Agree to both. I was so hot when I first caught it I posted without investigating. I put 2 new brushes in and went back to carving and on 2 hours to finish the carve it wore away half the brush. Even though I might add. I'm done for today. This retired life doesn't feel very retired. I'll open it up tomorrow and check it out and add some pictures. I had one spare motor left so I installed that and ops checked. It pulsed well and that reminded me that the bad one didn't pulse when I did the pm the other day. And that motor has been sounding quiet for a while.

[Digitalwoodshop]

Don't you just love this retired life... Working long hours in the shop..... I am typing in tags tonight....

Glad you had a spare motor. I got one the other day.

AL

[unitedcases]

Very busy for sure. It looks pretty wore down to me. And the bearing has a bit of play. But the rest of it looked good. If memory serves this was a rebuild from cw. So it lasted a couple years. And you guys know how I run them...

http://images.tapatalk-cdn.com/15/09/26/e2a1641ed5fa195c6ed768f1601675b9.jpghttp://images.tapatalk-cdn.com/15/09/26/de58f0dd4e59f6c0fa28682d38484885.jpg

[bergerud]

Wow, that's as worn as I have ever seen for an AC motor. You sure got your use out of that one! Any idea of the hours on that?

[unitedcases]

It's at least a couple years old and I pm them every 150 hours, average about every other month for each machine. So1800? Ish?

[Smoken D]

Good to share this info guys. Gives me a little education how and what to watch for. Thanks

[Digitalwoodshop]

1800... WOW.. Thanks for the pictures.... THIS is why I look for Cut Motors even if they have a cracked case... You can put a new "er" armature in a case like that after cleaning all the carbon out and you have a new motor.... not much to wear on the case and stator and brush holders if you maintain them.

AL

[DianMayfield]

Just goes to show that with the right care, our little "enthusiast" machines are pretty darn robust :)

[unitedcases]

Anyone have any idea when they will have cut motors in stock? Or rebuilds again? Need to order a Y belt so looking to bundle...