ROBO3D Y Axis Improvements

thingiverse

After discovering the pillow blocks split on my printer and never being completely satisfied with the Y Axis rigidity, I decided to make some necessary modifications. To prevent the new ABS pillow blocks from experiencing the same issues as their predecessors, I created 1.5mm aluminium clamp plates using a CNC mill. The design took into consideration the need for support without obstructing the movement of the screws on the bottom of the heated table. The pillow blocks proved to be useful not only in supporting the bearings but also serving as a jig to fabricate additional components, such as these aluminum clamp plates. To further improve the Y Axis's overall rigidity, I machined the inner ends of the pillow blocks away, increasing the distance between the linear bearings and providing better support. This design modification yields approximately 25% more rigidity as it relocates the recirculating balls closer to the middle of the bearing, rather than near their extremities. Unfortunately, the original 8mm rails did not meet the desired diameter specifications, prompting me to acquire new rails with the correct size and trim them to length. I then ensured that the ends were secured tightly using M3 threaded fasteners after drilling and tapping holes for optimal reinforcement of the Y Axis assembly. Lastly, as the Y Axis toothed belt remains a vital component holding the entire system together, I carefully drilled and tapped holes at the end pieces with precision to securely attach M3 screws (I had to employ some card shims for an 8mm diameter to perfectly align the magnets). The increased rigidity achieved within this sub-assembly allows for a higher degree of accuracy during movement without over-tightening these screws.