I made two sets of 1/2 inch (~13mm) cupped rod ends using a cordless drill holding the rods in my hands with the cap screws installed. My CNC-grade ball end mill bit set me back $45 (tool truck price) since I went with 1/2 inch spherical magnets, but the process it self was simple and painless.
With that said, there is an ongoing research thread on the Google Deltabot forums now building on a gentleman from New Zealand's use of tensioned strings and rods with non-magnetic spheres on the end. The string between the carriage and effector plate holds the rods into their sockets, eliminating the magnets and end play at the same time.....
With that said, there is an ongoing research thread on the Google Deltabot forums now building on a gentleman from New Zealand's use of tensioned strings and rods with non-magnetic spheres on the end. The string between the carriage and effector plate holds the rods into their sockets, eliminating the magnets and end play at the same time.....