This video shows Eve's arm components from the shoulder - it does not show the shoulder pan motor that is braced to the spine within the torso or any of the wiring and connectors that still require manufacture.
Each arm consists of:
23 3D printed components,
4 brass 12 toothed motor spline cogs,
2 brass 12 toothed custom centralising shaft cogs,
4 M2.5 motor shaft screws,
2 low profile pan M3 25mm centralising screws,
48 M3 25mm securing screws,
19 M3 8mm securing screws,
12 6mm actobotics mounting screws,
8 10.5mm actobotics mounting screws,
2 51107 35x52x12 thrust ball bearings,
2 90 degree Quad Hub Mount Hub C connectors,
1 3 inch actobotics channel,
1 90 degree pattern mount actobotics connector,
1 Hitec 5685MH servo motor,
2 Hitec 7950TH servo motors with screw mounts,
1 Hitec 7950TH servo motor without screw mounts,
2 pre-assembled Hitec CM-9380TH-180 Servo Gearboxes.
That's a total of 148 components per arm (without wiring, connectors, springs or any fingers). I would like to get that number down to 3 when my new click together servo modules are developed - shoulder, elbow and hand.
I would like to add fingers and related motors, a slot system to remove arms quickly for clothing changes, and have yet to manufacture proper wiring solutions to keep things neat but the components are coming for prototyping. I will also be adding anti gravity torsion springs in a few of the motor systems. Of course all 3d printed plastic parts will be fabricated properly using another method if 3D printers do not substantially improve before these robots go to market. Also, the screw threads are currently weakly biting into the PLA plastic holes, and are often not 100% secure, so it would be nice to modify all holes to incorporate nuts, or better still, replace all plastic with aluminum die casts if possible. Everything works quite well except for the gravity issues on these weak hobby servos. I hope support springs will completely solve the problem of jitter, buzz and servos catching fire. Also, I need to develop a much faster method of calibrating motors when connected to rotating parts so that the arms work just like a human arm without the possibility of inaccurate insertion. Unfortunately, a design mechanics company has ripped me off and stolen my life savings and inheritance after I paid them upfront milestones to build new series-linked servos from scratch. I am currently in the process of retrieving that money in court, so hopefully I will be able to get back to creating click together series servos with a lot more power, rotation arc, slip disc wiring and holding brakes this year after I win my case.
In the past 5 minutes I have compared the 6/32 zinc plated screws required for actobotics components with the M3 stainless machine screws I have been using. The M3 screws are 1.5mm too narrow to securely hold the actobotics parts in place but the 6/32 screws are a good enough size for my plastic parts. Also, the zinc plating makes the screws magnetic, which would have saved me a lot of frustration with the thousands of screws I have used. Stainless does not stop the screw heads from stripping so there is no advantage to it unless I am worried about future rust - but the zinc takes care of that. The screws that come with actobotics also have much coarser threads meaning that a screw that would normally take ten seconds to remove can now come out in only 3 seconds. I think I'll replace all my screws with coarse threaded zinc plated 6/32 screws. The coarser, wider threads also seem to prevent pulling out throught widened holes in the plastic, and thus seem to lock in tighter without risk of slipping out. They seem easy enough to source...actually, the past hour has proven to me that they only come from America where they cost at least $80 with several weeks wait for delivery instead of $20 with a 2 day wait. I'll need to find a middle ground...the only middle ground is M3.5 screws which are also very rare. The problem with screw heads is that they often tear apart, especially philips heads which were actually designed to do so to protect the wrist while drilling. So the deeper the socket, the less likely it will shred. Hex screws I've used in the past have shredded even more easily than philips heads. But when weighing up the factors of magnetism, coarse threads for added grip, total compatibility for maintenance, less likelihood of shredding the socket, low profile, insertion speed and availability, the 6/32 screws from servo city are actually reasonably priced. The profile is pretty high, but they are very shiny and look absolutely part of a finished market product. The sockets are more durable as well. I've only twisted the heads off twice. Pretty good. This means that I may buy all 6/32 screws from there until I find a better idea. I think the high profile will not get in the way anywhere, and the diameter seems to be compatible with all my connections.