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Thank you for your interest in the ball launcher. As mentioned, it is improvised from miscellaneous parts that I have lying around so builts should vary a lot for different people. Part 1 01:53 shows a summary of the current project, with more details shown for the two main components - (1) launcher tube (Part 1 0:00 - 0:12), and (2) the feeding motor plus ball staging plate (Part 1 0:19-0:25). The feeding motor has a low rpm and high torque, taken from a broken door window glass controller (window regulator) from an old Honda vehicle. Sorry there are no detailed step-by-step tutorials.

Got it took a pulley and put 2 bearings on either side in lathe

Sorry I did not machine or assemble the "rotor/bearing/casing" by myself. It came as a single unit that I picked up in a flea market and did not know what it was originally intended for (see Part 3 02:09 and Part 2 02:48-03:00). The "dark colored ring area" is the sealed bearing, and there is already a pre-threaded 1/4-20 hole in the rotating shaft body for threaded rods. It looks like the bearing was directly press-fitted to the shaft with tight tolerance.

Inner tube: It is not PVC but just a standard postal mailing paper tube, diameter = 2 1/8" Disc inner diameter = 3 1/2" (= size of the hole-saw blade used to cut the inner hole of the discs) Disc outer diameter = 6 5/8" Sorry, no calculations were done. The joined-paper discs are simply "empirically" stretched out along the longitudinal direction till the inner edge of the disc physically touches the inner tube surface, and then secured with hot glue. The final pitch obtained this way is about 4 inches.

The Singer ac motor speed was manually controlled (or rather set) by voltage , with the Berkeley flea market PS shown in the video. Besides having regulated DC output, it also got variable AC output within 0-120V very much like a Variac.