I assembled the CNC on furniture rails. But there's a problem?

Question

Arduino

I'm wildly sorry. But I have a question. I assembled the CNC on furniture rails. According to this example: https://portal-pk.ru/news/123-samodelnyi-frezernyi...
Everything works fine. For this special thanks to the author.
But there is one problem. In one place, the X-axis motor starts to twitch and the movement stops. Until you return a couple of revolutions back, it doesn’t move anywhere.
What is the problem. Can anyone come across?

Answer 1

Something is clinging.
To check, remove the nut and roll the portal back and forth with your hand, it should slide easily with a slight rustle.
Perhaps a grain of sand or shavings got into the rail, you can try to rinse and re-lubricate.

Answer 2

This means that the guide is stuck, and the engine is not powerful enough (or it is given little current) to turn the shaft (or whatever you have) yourself. Look closely at that place, you can use a magnifying glass, a flashlight, a thick sheet of cardboard with an even cut (well, just a straight edge), a laser pointer, an exact square or a corner.
At worst, try flipping the guide 180 degrees.

Answer 3

Most likely you are catching a misalignment along the axis. Which, in general, is not surprising for this design.