#Harrison-Low #video about eliminating knotted string from his #robotics #mechanisms by wrapping his kevlar threads around screws and then squishing it under the screw heads by tightening them. Maybe he should have just used a trucker’s hitch?
#Harrison-Low #video #toread about redesigning #robotics joint #mechanisms
#Harrison-Low #video about how his #Stewart-platform juggling robot finally can juggle, two balls anyway. He actually did switch from kevlar to #UHMWPE (Dyneema) which I thought wouldn’t handle the friction heat. He shows the pseudo-capstan “hand” #mechanisms that actually throw the juggling ball. Oh, and he's using Zulip instead of Discord to make it more open. #robotics
#Chronova #video #toread on #manufacturing tiny steam-engine #mechanisms.
#Steve-Mould #video #toread on #illusions
#video on the Maxwell criterion for #precision #kinematic-coupling explaining how you want potential movement to be nearly perpendicular to the bearing planes
#video somewhat poorly explained on #3D-printing #kinematic-coupling #mechanisms for #precision #optics. He shows his optical kinematic mount for a long time without showing what he’s going to use it for, instead trying to explain it in words. He has a green diode laser module mounted in a 3-D printed thingy which is pushed apart with screws (with ground and buffed ends rather than ball bearings as you’d expect) running through soldering-iron-staked brass inserts, pushing on flat stainless steel plates, pulled together with tension springs pulling on bits of welding rod, and pivoting on a 7mm stainless steel ball bearing; all the metal parts are inserted into the plastic framework. I think the idea is that you slide this thing around on a surface and the angle of the laser changes to show you the angle of the surface. The laser module is clamped into the thing with an M4 screw tightening a sort of plastic shaft-collar arrangement around it, and a Powell lens (?) turns the laser beam into a line, which I guess lets you determine the surface’s angle in both dimensions at once? He thanks “Zachary from Breaking Taps” for tips. He’s planning to focus the laser through a spatial filter with a microscope lens to clean up the dirty “cat’s-eye” beam. He’s going to put ball bearings in the base of the mount too, to hold it up (bizarrely, four of them instead of three!), and there’s a screw in the middle to hold it down to a screw hole on the optical breadboard. He's planning to replace the plastic with aluminum or stainless steel. In the comments, @bansci recommends using #OpenFlexure designs and captive nuts rather than heat-staked inserts.
#video on #Cylo problems in #precision #optics #manufacturing #mechanisms: “Nanoscale air bearing vibrations cause surface finish issues in diamond turned surfaces.” 50 nanometers of vibration gave a “hazy” surface finish, although you’d think it wouldn’t.
#video #toread on #Cylo’s thrust air-bearing prototype. #precision #mechanisms
#video #toread on Carlos who got kicked out of his #underground #stealth-camping house in New York City’s Freedom Tunnel in 02012. He has a hard time recognizing people’s faces, it seems, and has some apocalyptic delusions from Family Radio, 94.7 FM.