Cutting a motor commutator & motor tweaks

[marvinbeaverdip]

Are you still running 3s with this?

 

[JeremyH]

Yes, I run them at about 10V or so....

Well, I think I am getting a bit better at this. Here is an Axiom 19T that I pulled out of my TC3:
(after the first pass)

(after the second)

(finished)

 

[Duuuuuuuude]

You really ought to drop the juice down. They work sooooo much better @ 3-4v.

 

[JeremyH]

Ok....I'll build up a smaller NiMH pack. Thanks for the tip. "thumbsup"

 

[JohnRobHolmes]

His lathe has so much geardown, I would be afraid of the bit grabbing and trying to make cuts that are too deep to offset the slow face speed. If you can tach the armature speed, you can figure out if you are in the good zone of cutting speed. 10v should be right for the lathe.

 

[JeremyH]

So John, what voltage do you recommend? IIRC, the instructions said 7.4V-12V....which is why I figured that 10V would be just fine. I guess I can use a fully charge 2S lipo and just charge it about every 5 passes or so....

 

[JeremyH]

Here are a few more that I cut this evening. These are Brood 35T Big Wires from my berg:

(Rear before)

(after a few passes)

(finished)

(front finished...it was in better shape)

Instead of jacking with batteries, I picked up a Muchmore Motor Master and I have been cutting these at 4.0V....much smoother.

 

[Khador12]

Dug out all of my old motor tools picked up a Hudy lathe, now I need to pick up some old comms to practice on. I also race 1/12th scale, so I have a few 1s lipos to try for a power. This is a great thread. The help from the top motor builders really helps alot.

 

[Deezul]

anyone know where to buy a comm stick?

 

[EeePee]

Racer's edge dot com?

 

[EddieO]

I think racers edge still sells the old style ones, but in the end, its really just a hard eraser. You can make one out of a pink eraser and get the same results. The best comm stick is the fiberglass strand units. Not easy to use, but very effective.....you can find them at walmart in the auto section as a rock chip sander....typically are black with a funky handle.

Later EddieO

 

[EeePee]

Beat ya. :mrgreen:

 

[EddieO]

You probably abused your mod status to modify your posting spot.

You should pick up one of the fiberglass sticks too, they clean brushes better than anything I've found.

Later EddieO

 

[4xFord]

I think racers edge still sells the old style ones, but in the end, its really just a hard eraser. You can make one out of a pink eraser and get the same results. The best comm stick is the fiberglass strand units. Not easy to use, but very effective.....you can find them at walmart in the auto section as a rock chip sander....typically are black with a funky handle.

Later EddieO

Man Paul (Rock Hard) has been telling me that forever now. I need to go track one down. :x

 

[EddieO]

Just for the record, I don't recommend using a comm stick on the comm really....I only use mine to clean the brushes....mainly the face. I clean the sides with a piece of printer paper (just rub each side on the paper, will clean them nice...)

But in a pinch if all else fails and no comm lathe is available, its worth a shot to get the crap off the comm....

Later EddieO

 

[Deezul]

Hmm off the find a a fiberglass stick. I have no lathe. Would putting the stick in the brush hoods and turning the comm by hand hurt it?

 

[EeePee]

You probably abused your mod status...

You should pick up one of the fiberglass sticks too, they clean brushes better than anything I've found.

Always.

So happens I have one. Though the bristles are quite short and make a lot of dust, which I find not right, but very well may be. Either way, it's quite effective for removing the stuffs on the brushes.

Can't say I use a comm stick much at all anymore, since I got the fiberglass stick, a la TEDROCKZ. Good guy that dude is. "thumbsup"

Would putting the stick in the brush hoods and turning the comm by hand hurt it?

Fiberglass stick? I'd stick to a comm stick for that. Seems the fiberglass might actually scrape the comm and do more harm than good. I could be wrong, but that's how I feel about it at this very moment.

 

[EddieO]

I've seen them actually used on the comm, but I don't recommend it...

The worst thing about the fiberglass sticks is if shards of the stick come off, they can be very itchy....I never use them over my clothes and always wash my hands right away.

Later EddieO

 

[EeePee]

I just used mine as a tongue scraper.

 

[Deezul]

Ok so no fiberglass on comm. I'll get some RE ones I guess. Lathes are too $$