PDJ #8 - Finally a Hand That Can Throw!

I've been quite busy with other things over the last few weeks, but I'm back to working on Jugglebot again now!
This is a very exciting update, as I've finally figured out a workable solution for Jugglebot's "Hand".
This video covers how (and why) I moved from the old hand design to this one, issues I encountered while designing this mechanism, possible/probable future improvements, as well as what the next steps are for the project as a whole.
As always, I hope you find this video interesting!
00:00 - Intro
02:49 - Recap and Problems with Old Design
07:42 - Progression to the New Design
10:35 - CAD View of New Design
11:51 - Comparing New and Old Designs
15:13 - Issues I Faced with the New Design
22:09 - Improvements to make on This Design
25:30 - Next Steps for Overall Project
30:01 - Final Remarks

[@weirdsciencetv4999]

Pretty ingenious work

[@CodeWithPrabesh]

This looks sick.

[@large65]

Even though it is 9 months old. Have you tried to actually braid the strings together? That should lock them pretty much together. And with the adjuster blocks you mentioned at the end the braided strings should be good.

[@harrisonlow]

I swear I replied to this message a little while ago? Either way: I actually did braid the strings together after carefully lining them all up correctly, and that was rather tedious to do. It was quite tricky to get the lengths perfect while braiding and even a tiny difference in one length would tilt the "cup" of the hand by an appreciable amount.
My current solution is a new tensioning mechanism that deals with each string individually and allows me to modify their lengths extremely precisely, which I much prefer over having all the strings bound together.
Cheers for the suggestion!

[@nikolaikruglikov7358]

I know it's old, but I constantly wondered whether this crunching sound it makes is a bad thing? Sounds bad, but you didn't comment on it, so may be it's not an issue?

[@harrisonlow]

That's actually caused by the constant force springs winding and unwinding from the rod that they're on. It wasn't really an issue, but has been (mostly) fixed now by mounting the springs on small hubs that spin on bearings

[@haukzi]

What notetaking software are you using here? 10:10

[@harrisonlow]

It's called "Concepts". I really like it and it's the only note-taking/drawing app I use now 😊

[@MichielvanderMeulen]

why not use elastic rope?