Here's a little update on my version 2 Archimedes pulley system. It's cleaner than v1 version and you'll note that rather than tying off ends into the 1000 denier nylon fabric sleeve of the bone, which chafed the attachment point and caused premature failure on version 1, I'm now tying off onto the eye of a fishing hook that I get by snapping the hook's eye off with wire cutter and sanding smooth with nail file. Also I'm using a fisherman's knot rather than square knots as that handles higher loads without snapping or stress concentrating too much locally. What you see in this photo is 4:1 downgearing. Add this to my 2.77:1 downgearing with the winch in place pulley on the motor by its output shaft and you have nearly 11:1 downgearing so far. I need to add just two more pulleys to get to our 44:1 downgearing final output. Note that I have two yellow lines coming off the bottom pulley pair since I plan to load distribute across two lines instead of just one so I can use my load capacity limited 1x3x1mm ball bearing based pulleys and not overload them. This divides the load by two. I'll be using double stacked pulleys for the next couple downgears to share the load across double pulleys instead of single pulleys. I'm getting so close to electronics phase for final testing of all this downgearing madness!
Discussions
Become a Hackaday.io Member
Create an account to leave a comment. Already have an account? Log In.