Hey everyone, I’m starting to wrap up the hardware portion of the build but I wanted to make sure my motors are okay. Everything is explained in the video. I would greatly appreciate any input I can get.
In a nutshell, with the motors unpowered, pushing them feels very stuttery, making me worry that a motor shaft is bent.
That’s normal if you don’t push them evenly. They make weird noises that sounds as if they were broken. 
The MPCNC in the video is the Burly, so the old version and I don’t know exactly what that video is supposed to show me. 
Your belt might have too much tension on it. Hard to tell from the video. Also make sure that’s not steel reinforced belt
Belts should not be real tight. I think Ryan mention 7 lbs as the tension, which is not very much. On my machine, if I pluck a belt it makes a low thrum note. BTW, if the notes match when you thrum both belts, the tension will be similar in both belts.
In order to figure out if you have a problem, tighten both belts then push from the middle of the tubing. You should get smooth movement. I think you are getting the skipping because the opposite side is binding.
Thanks all, I loosened the belts and now it is mostly okay, I just need to fine tune the tension I suppose. Loose belts feels like an alien concept after building 2 Vorons.