Replacing Bent Shafts

How many motors do you have laying around that can't be used because of a bent shaft?

I had a couple of motors, and I searched on the internet and didn't find a lot of information about it, so decided to share this photo-tutorial with you :

Replacing Bent Shafts

I have chosen the NTM Propdrive 35-36 1400 kv, as its shaft was bent, and also because it is a very popular motor, like the one in the EPP FPV, check it out if you haven't yet:

http://flitetest.com/articles/epp_fpv

Ok, so lets start with the build.

First of all, you need to get a spare shaft. I got mine from an Industrial hardware provider as a "machined carbon steel" 4mm shaft (they had 100mm long) for 0.80$ As it was too long I had to cut it but you can get the exact same shaft from hobbyking or anywhere else.

In my case, I had to cut the shaft, so I measured mine, wich was like 2.4 inches (61 mm). 

I decided to cut a bit shorter, as longer shafts get bent easily, so time for cutting. It was actually easier to cut than what I thought it would be...

Once you have finished cutting, you need to sand a bit the edge

Now we need to separate the bell and shaft from the motor, to do that, we need to get rid of the little metal lock in the saft, this one

Now both parts simply come appart.

Now we need to unscrew the little allen screw on the bell just like this:

Once removed, we need to separate the shaft from the bell. I would suggest to hold the shaft really tight on your workbench, and simply grab the bell with your fingers, and twist the bell as if you were unscrewing it, while pulling up. Just like this:

When you have separated the shaft, you can notice that the part of the shaft where the screw goes, is like this

So you just sand the same little bit for the screw to fit, like this

Now you need to introduce the new shaft in the bell, paying attention to the shaft position so that the little part that we sanded, matches the screw. To get the shaft in, you can use a little hammer and CAREFULY push it in

Now just screw the little allen screw in

You can now join the two motor parts 

Now, if you are going to mount a normal prop adapter, you are fine. BUT, IF YOU ARE GOING TO USE THE MOTOR WITH  SOMETHING LIKE THIS:

YOU MUST KEEP THE EDGE FROM GOING BACKWARDS WITH A LOCK OR ANYTHING ELSE (like in this HIMAX):

And thats it ! we have finished replacing the shaft !

Thanks for reading ! Hope you enjoyed it

Please rate ! :)

Mike