Hacks

BNC/LED lamp

BNC/LED lamp

Russell Jones from New Jersey wrote in with his cool-looking LED lamp: I had a bunch of BNC right angle, straight, and T connectors, so I decided to make another lamp. I didn’t want to purchase anything for the lamp except the polycarbonate diffuser rods, which is McMaster #8571K44. The 5/16″ diameter rods were cut […]

How-To:  Make cheap castable silicone from caulk

How-To: Make cheap castable silicone from caulk

Turns out, though, that mixing in some cornstarch accelerates the drying process; just how much depends on how much starch you add. The author recommends starting with a 1:1 mix. I’m not sure about his explanation that the process works because the hygroscopic starch carries moisture into the internal volume of the silicone, but in any case there are probably other additives that will accelerate the process as well as or better than cornstarch. You might even find one that’s not opaque and allows for translucent castings.