motors
 

Im running a 55t novak motor and it about dead I don't have much money and im still running stick packs I want a motor that has more wheel speed any suggestions

comm cut and new brushes?

how cheap of motors? I think you can buy 540 can size non rebuildable motors for 10 bux each at RC4WD.com
Integy machine wound motors. 45T give you a bit more wheel speed.

But maybe your brushes are worn down or they are sticking causing arcing on your comm. Maybe just need to be cleaned up and add a dab of oil to the busihings on each end to free it up a bit.

maybe a titan 21T? Those are $10-$15 I think.

Ya you're probably right I may just need brushes the motor is old thanks guys

I would cut the comm as well.

Get the comm cut, a fresh set of brushes, stronger brush springs(minimum 13 oz), maybe even get the magnets zapped. Then set the timing between 6-9 degrees advance and wallop.

Whats this comm cutting business? what benefits will a guy see when he gets the "comm cut"

The "comm" is short for commutator and is what the brushes ride on and transfer the power threw. Cutting it is just having it run on a lathe to clean up the surface back to clean copper. Doing this and new brushes along with getting the magnets zapped will make it essentially a new motor or better than new.

Also, cutting the comm makes it round & smooth which reduces brush arcing under load.
You really need a "motor lathe", not just a metal working lathe.8)

Why not a metal working lathe. It still spins the work and the cutting tool still removes the same amount of material from the comm. Biggest difference is the cost and portability between a real lathe and a hobby lathe.

A big lathe can work, its just a lot more difficult to setup to cut a comm in most cases....

I just replaced arms in a motor from a guy who claimed to be a machinist and had attempted to cut his comms in his lathe at work......didn't turn out so well.......not only did he screw the comm up, he managed to bend a shaft on one and put a huge cut in another....

Later EddieO

Can it work? Sure.
Is it the best bet? Nope.

I have done it before, but the big lathe is usually so clunky (unless you have a smaller specialized lathe) it's tough to PROPERLY support the arm AND get a good tool in to do the cut.

A smaller collet lathe would be decent, but most don't have that.:roll:8)

Sooo how bad of an idea is it to "rough" up the comm and brushes with some 1500 grit?

Big Jim used to cut all his stuff on his little Unimat, but even after a while he abandon it for a pit lathe. When I started brood, he was telling me everything I needed to buy..........finding a Unimat was not fun. Nice ones sold for more than they were new! I ended up getting a Emco compact 5, which was the new version of the unimat. Jim was supposed to get some custom brass collets made for me by a friend, but he couldn't get the guy to do it. Normal collets can leave marks in the shaft....

I ended up ditching using the lathe, it sat for a while until we started using it to lathe down armatures stacks.....and then when we used it to lathe down the solder tabs to fit on the Jimmy Hat comm rings.....now I've got it pulled apart again to grind down armature stacks with a new attachment I got off a tip from the slot car guys.

Reedy used a very fancy air controlled big lathe to do comms, but all the colletts and such on it were custom and such. Everything was quick change on it, so it could really pound them out.

Later EddieO

Like bad.....say like getting caught in yer girlfriends room naked by her dad with a shotgun bad.

Later EddieO

That sounds pretty bad haha

Real bad.

My comment about the lathe was that a good machinist that understands the motors could do it. I never said it would be ideal. Personally I use a Xipp lathe.

I think HH makes a motor that is a sport motor that could get you running again. Get the 35t though if I were you.

I agree, anyone who really knows what they are doing should not have a problem....though thats about less than 5% of the people who own lathes:mrgreen:

The Xipps are good little units if you take the time to set them up correctly.

Later EddieO