Lately I've been getting interested in heat-welding plastics, and so far some of the best practical, hands-on advice I've found within the tubes comes from this black-and-white Seelye Model 63 Plastic Welder manual posted over at amphibious / all-terrain vehicle enthusiast site 6x6 World. t's posted as low-to-middling resolution JPGs, so the quality isn't great, but it's definitely readable/usable.
How Oscillating Tools Work - An oscillating tool works with a side-to-side movement. The oscillation is very slight (about 3 degrees) and very fast (about 20,000 strokes per minute), so it feels more like vibration. A saw blade is shown