3 ms·
Made me want to look up dental drills. Wikipedia says they can spin up to 800,000 RPM. Never would have occurred to me that the fucking drill in my mouth was r
by delluminatus 13y ago
Made me want to look up dental drills. Wikipedia says they can spin up to 800,000 RPM.
Never would have occurred to me that the fucking drill in my mouth was rotating 10,000 times a second.
- verisimilitude 13y agoEnamel is really _really_ hard stuff. Believe me, air turbines are preferable to the cable-driven drills dentistry used to have. They do have electric dental handpieces now and the advantage is the same as with electric cars -- no loss of torque through different RPMs. They also don't have that characteristic whine -- nice to use, but a bit bulky and quite expensive.
- grinich 13y agoThose dental drills are powered by an air turbine, though. Dyson (notable for their vacuums) actually have done a bunch of work pioneering high-speed electric motors. The Dyson Digital Motor is awesome and runs at +100k rpm. They're used in the "Airblade" hand dryer. http://www.dyson.com/vacuums/ddm.aspx http://www.dyson.com/vacuums/ddm.aspx
- mercuryrising 13y agoThe dyson motor doesn't show any sizes, but 100k spindle motors are not impossible to make. They're commonly used for PCB production > Some of the high performance spindle motors used on large-size mass production PCB drilling machines are capable of running at 200,000 rpm or higher. from http://www.mitspcb.com/edoc/spindle.htm http://www.mitspcb.com/edoc/spindle.htm
- grinich 13y agoIt's surprisingly large: https://www.youtube.com/watch?v=6kcGltYWz3k https://www.youtube.com/watch?v=6kcGltYWz3k
- raverbashing 13y ago"Never would have occurred to me that the fucking drill in my mouth was rotating 10,000 times a second." That's the reason why the noise pitch is so high, rotation speed. Very fast, and the easiest way to attain such speeds in those conditions is with a pneumatic device.