Videos (86) | Sift Talk (7) | Blogs (5) | Comments (448) |
Videos (86) | Sift Talk (7) | Blogs (5) | Comments (448) |
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Baby Polar Bear Sees Double
The thumbnail image for this video has been updated - findthumb requested by eric3579.
The duration of this video has been updated from unknown to 1:03 - length declared by eric3579.
Infinitely Variable Gearbox For Bikes
The thumbnail image for this video has been updated - thumbnail added by blackfox42.
We’re not ready for the next outbreak! - Bill Gates TED
The thumbnail image for this video has been updated - thumbnail added by eric3579.
Martha Stewart sure knows how to roast!
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3D printing 100X faster and inspired by the Terminator movie
There's actually a neat trick to smoothing the surface if you are using ABS. But it requires boiling some Acetone.
https://youtu.be/Jv-CbnB8Uz4
Now there's no 'finishing' step where someone smooths out hundreds of tiny 'steps' from one level to the next.
3D printing 100X faster and inspired by the Terminator movie
The filament style of 3d Printers are cheap to operate and can be made to nearly any size.
A resin printer needs a photopolymer, something that solidifies when exposed to UV light. They also need a fairly strong projector and lens, which limits their build area.
A filament printer can use a lot of various materials, the most common being PLA (a bioplastic made from renewable plant materials) and ABS. There are many other materials, some are specialty that have an almost rubber like flexibility to them, to a filament that is made from wood and a binder, which results in an printed object that can be sanded and stained. And, since you are moving a print head, the only limitation to the build size is how big you have made your printer.
I did not know that; so---why did the deposition 3Ds come into being? Was that about cost of materials, even though they are apparently 100X slower?
This is quite educational for me.
A Real Folding Table
Looks like something you could duplicate on a sizable 3d printer.
...for like, $750 in ABS.
Ambulance Brake Pedal
My guess would be that there is something wrong with an ABS system.
Conan Takes Spanish Lessons in Cuba
The thumbnail image for this video has been updated - thumbnail added by blackfox42.
Freeman's Mind-A complete YouTube playList with 68 episodes!
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Riding Light: A journey of a photon through our solar system
http://www.adsabs.harvard.edu/abs/1992ApJ...401..759M
Is that true?
That's fascinating.
Russian Drifting
From my experience, and physics class, that should only be true if your brakes suck. Physics don't lie, and I was taught that static friction is ALWAYS greater than kinetic friction...meaning rolling tires grip better than sliding tires every time. If your brakes are able to grip with more 'stopping' force than the sliding tire produces and still allow 'slip', they should be able to stop you faster than sliding.
Perhaps on ice that's true, or other slippery surfaces where the sensors get confused, or with really bad or broken ABS, but good ABS seriously reduces the distance to stop AND retains control by rapidly (thousands per second) pulsing the braking force up to maximum possible force without stopping the rotation. That should be more stopping force than locked tires can produce if the brakes are in good condition.
I've been in the car when an idiot friend decided to prove it to me, and slammed on his new BMW's brakes at about 70mph. The seatbelt hit so hard I had the wind knocked out of me, and we stopped ridiculously fast (WAY faster than when I've locked up non-abs cars on the freeway...repeatedly). Afterwards, he needed new brakes all around, because they gripped so hard and hot it warped the new rotors, but never locked up the tires...retaining static friction between the road and tire. Dumb...but informative.
Newt, I gotta tell ya, there is no quicker way to stop than locking up all four wheels, other than spinning in the other direction on a dry surface to kill inertia (makes it worse on ice). You just have no control. ABS brake systems actually increase the distance needed to stop, they just provide the ability to control and turn at the same time.
Russian Drifting
Newt, I gotta tell ya, there is no quicker way to stop than locking up all four wheels, other than spinning in the other direction on a dry surface to kill inertia (makes it worse on ice). You just have no control. ABS brake systems actually increase the distance needed to stop, they just provide the ability to control and turn at the same time.
Reservoir Dogs - Mr Pink doesn't tip
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Baby Ride Easy - Carlene Carter and Dave Edmunds - 1980
The thumbnail image for this video has been updated - findthumb requested by eric3579.