Quick question about soldering a motor & grinding a flat rotor spot.
 

I realise this is a bit of a newbie question, but I have to be sure. I was wondering about the 3 colours, white black red. Exactly where does the red one go, and the black one? Is there anything WRONG?

And also, I'm not sure what to search for exactly, but how do I grind a flat spot on the rotor shaft for a pinion? What's the best approach to doing this?

The color of the wires means nothing. If the motor runs backwards, just switch any two of them.

I use a small flat file to make flats on motor shafts. If the motor has holes in the front make sure to tape them over.

So you do it by hand?

Usually. It's more precise than a Dremel tool and there's no risk of accidentally going too far.

Here are the files I use. The flat file is about 1/4" wide, perfect for making the flat areas on motor shafts.

I would like to add that if you prefer a certain wiring sequence (I personally like it so the reds and blacks are across from each other with the white wire in the middle), you can always reverse the motor direction from within Castle Link.

And I grind a flat spot on all needed motors using a dremel. Just take a baggie and poke the shaft through. I even tape the opening just to be sure. This lets you work on the motor without the risk of getting filings inside the motor or bearings.

How long does it take to file a 5mm shaft? I have to grind a flat spot on a 1/2'' shaft in the future....

Thanks guys! :)
I will make it as small as possible, just enough to support a screw?

A couple minutes for a 5mm shaft. If it were larger I'd use a Dremel, though. A 1/2" shaft would take a lot longer. There's so much more material to remove and those files are too fine for big jobs.

What sort of motor has that size, and what are its applications?

Sounds like an e-bike motor to me... :whistle:

Well, it's a regular shaft not from a motor. It will be used in an E-Bike to make the reduction. The motor I ordered (which is at the customs right now) has got a 12mm shaft (almost 1/2''), it's a Turnigy 130kv outrunner.

http://1.2.3.12/bmi/hobbycity.com/ho...XT80-100-A.jpg