We’ve seen pick and place tools in the form of tweezers, mechanical pencils adapted to aquarium pumps, but never as a 3D printed tool optimized for standard blunt-nose needles in a comfortable, ergonomic shape.
[Zapta] created this 3D printed SMD hand picker to populate a few boards. The tool is mostly 3D printed parts that come together for an airtight enclosure. The needles are the standard eBay affair, with the smallest he could find easily lifting 0402 and 0603 components from their tape reel. There’s also the option to switch over to larger needles for bigger components.
There are files available for two versions of this vacuum picker – one with a hole in the handle for those of us who would rather connect this thing directly to a modified aquarium pump, and one for the geniuses among us who use a foot pedal and pneumatic valve to release the tiny part. Other than the pump, the only a few bits of tubing are required to turn this bit of 3D printed plastic into a useful tool.
Fashioning a custom, one-off rubber part for your project isn’t usually an option, but [Ben Krasnow] has an alternative to injection molding and casting: machining frozen rubber.
As [Ben] points out, you can’t exactly pop a sheet of rubber on your mill and CNC the needed shape; the bit will push the material around rather than cut it. Freezing the rubber first, however, allows you to carve into the now-hardened material.
His initial setup consisted of a sheet of aluminum with water drizzled on top, a square of neoprene placed on the water, and a steady stream of -60 to -80C alcohol flowing directly onto the rubber. The water underneath freezes, holding the neoprene in place. This proved problematic as the ice-clamp gives way before the milling is complete. [Ben] later adds some bolts to clamp the pieces down, allowing the milling process finish as planned.
A small plastic tray sits underneath this assembly to capture the alcohol as it runs off, feeding it back with some tubing. [Ben] recommends against a submersible aquarium pump—his initial choice—because the pump stopped working after a few minutes immersed in the chilly alcohol. An external, magnetically-driven pump solved the problem although it does require manual priming.
Stick around after the jump for the video and check out some of [Ben’s] other projects, like his quest for the perfect cookie, or CT scanning a turkey.
Continue reading “Cryogenic Machining: Custom Rubber Parts”
With fall approaching you might think about moving your gardening inside. [Jared] used cheap and readily available materials to make these salad-green trays. When used with his grow lights and tent (which he built during a different project) he was able go from seed to salad-bowl in just four weeks.
A pair of plastic storage bins act as the base, keeping the water right where it should be. Some holes cut into a piece of solid foam insulation holds a set of plastic pots in place, allowing the water to leech into the Rockwool that holds each plant in lieu of soil. To aerate the water [Jared] grabbed a cheap aquarium pump, splitting the output into several different branches. Each has its own check valve to ensure that a pump failure doesn’t let the water find its way out of the plastic tube. A set of bubble stones breaks up the output, helping to mix it with the water.
This isn’t quite as easy to pull off if you don’t already have a grow light. But you can always make it worth the investment if you decide to start next summer’s garden from seed. Or perhaps you can try to make your own using a varation of this shop lighting hack.