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Alan Timm posted an update 8 years, 9 months ago
A few more tweaks to my bicep remix, the parts are going on the printer today. This remix beefs up the bicep frames to 10mm.
Has anyone considered how much weight is being carried by the tiny little screw down the centre of the servo drive shaft that holds the horn onto the shaft? How big is on those servos, 1.5-2mm, 3 maybe?
Ya know, it’s an interesting question, and I don’t know what shear point is for the 2.5mm machine screw used. But in all cases where I’ve broken something, the plastic snaps well before the screw does. I’ve never had a problem with the servo horn set screw.
Not just the screw but the little thickness of the plastic horn under the head of the screw also.
Until now, 3 years of demos, I didn’t see issues with the horn part at screw level. Because I printed my parts in ABS with a 3 shell perimeter I never broke any of my bicep parts besides the early pistons which had a smaller diameter. So I’m guessing this beefier remix is ready for combat! 🙂