Homemade linear bearing (DIY). It replaces the linear ball bearing and can be used in mechanisms that require a linear displacement such as sliders for cameras, axes or guides in CNC machines, sliding gates and an endless number of applications. It is built with 4 inch PTR, ball bearings, say "standard", threaded rod or studs and some nuts. During the video you will find all the information and plans for its construction, use and possible modifications or adjustments to use it in your projects.