Smartbolts have little discs in their heads that change color as the right amount of tension is applied to them. I recently installed a child safety gate with a similar mechanism: a red, spongy washer between the bolt and the frame; once the right amount of tension was on the bolt, the washer was squished down so much it disappeared and you could stop tightening.
Unfortunately, a torque-wrench does not measure bolt tension accurately, usually only about +/- 30%, because it does not take friction into account. The friction depends on bolt, nut, washer-material, plating, surface smoothness, machining accuracy, degree of lubrication and the number of times a bolt has been tightened. Fastener manufacturers often provide information for determining torque requirements for tightening various bolts, accounting for friction and other effects. However, in field applications, this information is often not available, practical or administered poorly.
(via Red Ferret
All through 2016, Jessica Leigh Clark-Bojin (aka @ThePieous) has sent us a stream howtos for of amazing, artistic pies — an HR Giger pie, a James Bond pie, and a Predator pie. Now she’s kickstarting a set of pie templates to help you make perfect pop-culture pastry in your own kitchen.
Andrew Lekashman offers a brief pictorial a history of mechanical keyboards, from adding machines to dumb terminals to Symbolics monstrosities to modern blank-key hacker totems. There was a lot of ingenious tech left by the wayside on the way to finding the perfect click. Pictured above is one not included in the roundup, a particularly […]
Yesterday, we learned The Wirecutter (with sister site The Sweethome) was headed to New York City. It’s the sort of good ending that’s also a good beginning: they succeeded in their mission and have bright prospects for further growth. But Matt Haughey points out how much of the story everyone’s missing: the entire site is […]
I’ve never really felt the need to purchase a smartwatch because a lot of them aren’t very functional, but at just shy of $30, the Martian Notifier Smartwatch was worth checking out. For that low of a price, it actually does feature an impressive amount of functionality, and comes in handy when you don’t want to be carrying around your […]
Geek Fuel is a subscription delivery service that caters to those of us that love comics, gaming, and general geek culture. Every month, Geek Fuel will assemble a box of goodies with a value of $50 or over. The specific items are a mystery, but you’ll always get an exclusive t-shirt not found anywhere else, a full […]
If you like to DIY and you like helicopters, you’re going to really love the Flexbot Hexacopter Kit. This copter blows traditional models out of the water: it includes everything you need to actually build your own hexacopter, and then pilot it like a pro, too.The construction is complicated enough to give you a challenge, […]