🔧 Optimized SCS8UU Linear Motion Bearing Bushing Review

I used them in a 3 axis Arduino CNC build. The position and tolerance of the most important center line was exactly according to the specifications, but there were no tolerances for the less important dimensions. Following the 5mm hole spacing specified in the spec, I had no problem screwing them onto the panels I machined. I have found that most other product sizes are +/- 1mm or possibly more so be sure to leave enough clearance. Check the alignment of the critical assembly with the display.

. So these work and they're cheap, but be aware that there's a lot of room for user error in a product like this. The tolerances for a sliding linear guide to pass two of these are incredibly tight. Another quarter turn of a screw and the system locks up. You really want to add some fat or fat to them and your shaft too. They make a decent sound when the wave goes through them. Taking off a star because I had a bearing that had two threads screwed in incorrectly.

If all 4 worked as well as 1 of these would be a 4 star purchase. As mentioned, not all of the mounting holes were drilled correctly - not that they weren't cut correctly, but that some of the holes were milled at the widest point of the rail. The screws still hold them in place, but a few bad holes have less than half the threads. That alone should have been my signal not to buy them. 3 out of 4 - junk. They aren't smooth when not under load, they feel better when you press them against the…