Parts That Go Around
The Derin thrust bearing assembly is positioned on the drive-rod with threaded locking collars, allowing the assembly to be adjusted through these locking collars, for the proper amount of tension to be set-up between the drive rod and the bearings.
The motor-drive adapter also required carefull maching, allowing for precision allignment once installed in place. If the allignment of the motor assembly in conjunction to the drive-rod is out even a few thousands of a inch, the result will be a binding motion when the coil is powered through its range of motion, and in turn, this will cause pre-mature wear on the components making up the lower drive assembly, and in a worst case scenario, causing the drive motor to fail pre-maturily.
I now have the drive assembly for the most part completed, although with minor tweaking to be done, like drilling & tapping of the Delrin motor mount, for the mounting arrangement in the lower mast tube.