#DRAKON site for making better flowcharts with Soviet technology
#dyeing paper with alum #mordants and things like tea, coffee, turmeric, and blackberries
another #Malawey #manufacturing #video. JB-welding coaxial things inside a brass sleeve, which failed between 60 and 80 “inch-pounds” (7–9 N m) maybe because he didn’t let it set long enough. He says you can bond silicone to already-cured silicone (like a silicone sheet bought from the store) with full strength, so you can use it to jugaad things together, like an insulating pad he put on his magnetic-stirring hotplate, and an extra finger grip for his soldering iron, and his custom soldering rack with a silicone tube inside a steel tube. You can mix white silicone with any oil paint. Demonstrates how he can reuse a polyethylene cup after mixing white silicone with blue pigment in it. Demonstrates melting hot glue (EVA?) with a heat gun to make a light diffuser over a LED. Describes which plastics are annoyingly glue-resistant. Talks about Liquid Nails and similar construction adhesives, which he says are basically pasty wood glue (I think that’s chemically false) because it’s sandable and paintable, stronger than wood, water-resistant, shrinks when it dries, and washes off with water when wet (water cleanup). Then points out that non-water-soluble construction adhesives are totally different. He says the pasty stuff is better at filling gaps and so sometimes stronger in practice, though weaker in theory. Explains that J-B Weld does make something of a chemical bond with metal, not a purely mechanical one. Peels cured J-B Weld off a bicycle inner tube segment. Shows nylon resisting J-B Weld adhesion. Demonstrates how J-B Weld can be popped off ABS and soft polyurethane with some force. Taps 30-hour cured J-B Weld with a combined drill and M4 tap. He 3-D printed a PVC cement can lid grabbing tool! Then he gets off talking about Bondo and epoxy resin composites and whatnot. Demonstrates soaking nylon webbing in epoxy to somewhat stick it to other nylon webbing. Recommends E6000 or a similar contact cement like Weldwood for sticking to things like smooth, shiny polyethylene, but it still won’t withstand any substantial amount of tension or peeling. He did manage to glue nylon webbing by impregnating it heavily with black ABS cement! The adhesive he tried on EVA foam (Titebond PVC trim adhesive and sealant) didn’t stick, and between two sheets of nylon it didn’t even set.
#Malawey #video #toread on reproducible battery energy experiments
#video playlist #toread on easy #electronics experiments; the first recycles an RF modulator from a VHS VCR to modulate a signal from an analog security camera. #hoarding