It was pointed out to me that i didn't include several measurements from my Cable Drums...
1" rod stock, clean up OD
0.250 long shoulders at 1" OD
1.5" OAL
0.750" diameter cable bed (1/8" deep)
1" long cable bed
Center drilled for whatever mount system you're considering
Bonus points, Lightly score for alignment of servo horn OD or screw holes
Cable bed of spool is the last gear ratio of a cable machine, like changing tire height on a car.
Diameter x 3.14 = line pull per revolution. < 0.750" x 3.14 = 2.355" line per rev on base wrap >
Line pull per revolution x RPM (or look up Servo transit speeds, convert angle to 360...)
< 0.2sec @ 60 deg... 0.2 / 60 sec = 300, 60 deg transit = 6 per rev, 50 rpm = 117 inch of line per minute max speed > so i'm running channel EPA cranked way down.
Bigger spool = faster pull / less torque
Smaller spool = slower pull / more torque
Dragline fairlead (suggested prior art)
https://patents.google.com/patent/US3006608
I just use some redirect sheeves to catch and pull the crowd back inline to get through the boom in a Z path