Sounds like you have a few things going off here.

I'd definatley say this is something to do with the linear rails or ballscrew alignment, or bent, etc, as it doesn't take much to cause binding. Possible end bearing supports are lose or poorly fit bearings.

I'd also say because of the grinding noise, which is common with cheap Chinese ballscrews, the ballnut needs stripping and cleaning.
It's common for Chinese ballscrews to not be cleaned properly at the factory so grinding dust etc is left in the ballnut. That said I wouldn't recommend you go stripping the ballnut down without knowing a little about how they work and being prepared and setup to do it, other wise you'll have dozens of little balls all over the floor.!!



Quote Originally Posted by mbridge87 View Post
Side note – Where is the best place to purchase something like this from? If my budget were say £700 for something similar, where would you guys go? I know £700 is not a huge amount for a ball screw slider like this.
What length do you need.? I could make you something like this easy enough. PM me if you want to discuss it and I'll give you my details.