Hand placement works surprisingly well. Surface tension works to your advantage, centering the parts on their pads.
He’s been looking at ways of speeding up hand placement, especially for very small pitch parts. And found a great way:
It’s two acrylic sheets, sandwiched together. The lower is a frame for the PCB. The upper is a guide for the component placement. With the board pressed into the lower frame, the upper layer exactly places the larger components. Actually placing the parts is now laughably easy. The slots are precisely cut for each one, so it’s not even necessary to use a microscope. It’s possible to place 5 parts in a few seconds – not bad for a human!
After placement the PCB pops out of the frame leaving the parts firmly stuck in place in the paste. While this setup has been working really well for large parts, small components haven’t worked out — they tend to get lost in the holes in the acrylic.
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.