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Show HN: We put an iPhone on the front wheel of a car

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Re: Show HN: We put an iPhone on the front wheel of a car

#61

Post by DanBC »

columbo wrote: post #58
petrakeas wrote: post #32

Earlier quoted context omitted.

Developer of the app here. One step ahead of you ;) http://imgur.com/tdnympM

A box fan might be a safer alternative. It'd give you the ability to move it around but not the high rpm of a angle grinder.

I want the next "Will It Blend?" to be these people attaching iPhones to a variety of terribly dangerois machinery at high speed. Grinders, chainsaws, motorbike wheels.

Or maybe some safer things too - place it on a record on a turntable and film the face of the DJ doing some mixing?

Re: Show HN: We put an iPhone on the front wheel of a car

#62

Post by demallien »

lutorm wrote: post #53
Kayou wrote: post #24

Earlier quoted context omitted.

Did you see that it is only stabilizing rotation? If it looks so stable that's because the lens of the iPhone is at the exact center of the wheel. If you were to move your phone along a X or Y axis, I don't think those movements would be stabilized like you could get with a software stabilizer. I guess the main target of this app is people turning their device when shooting a video.

Translation of the camera changes the perspective, i.e., the relative positions of different objects in the image. There is no way a piece of software can get rid of that, because the information isn't there in the first place.

Don't forget that an iPhone has sensors other than the CCD, so it knows when the camera is being twisted / translated around. You would need some depth perception to recover the image, but lucky you, that's exactly what you get if the camera is moving.

Re: Show HN: We put an iPhone on the front wheel of a car

#63

Post by alxndr »

DanBC wrote: post #61
columbo wrote: post #58

Earlier quoted context omitted.

A box fan might be a safer alternative. It'd give you the ability to move it around but not the high rpm of a angle grinder.

I want the next "Will It Blend?" to be these people attaching iPhones to a variety of terribly dangerois machinery at high speed. Grinders, chainsaws, motorbike wheels. Or maybe some safer things too - place it on a record on a turntable and film the face of the DJ doing some mixing?

I want the next "Will It Blend?" to actually answer the stated question — "can this iPhone be used to make a smoothie?" — rather than "can it be blendED?".

Seems like strapping an iPhone to an angle grinder is getting close to answering the stated question...

Re: Show HN: We put an iPhone on the front wheel of a car

#64

Post by jotm »

Retric wrote: post #59
jacquesm wrote: post #49

Earlier quoted context omitted.

I hope you're joking. If you do plan on doing this then please do it in a suitably strong wire cage, power it on remotely, make sure it is tied down very solidly and make sure nothing you care about (including you, significant others, co-workers, children, pets, possessions etc) is in the plane of rotation because this will fail spectacularly. Keep in mind that if the grinder becomes dislodged or unbalanced that the…

11k RPM is not as fast as you might think. That 660,000 RPH * ~8 inch diamiter circle. So outer edge is 3.14*8inch/12/5280 ~= .0004 miles per revolution or 260MPH. But the center is stationary so actual force is a little less than you can throw it. Edit: Camera is not centered on the iPhone. So if you center the camera it's worse than that. I would personally not stand anywhere near it.

Have you never used a small 11k angle grinder? Those things try to jump out of your hand even worse than the big 6k RPM ones (without soft-start, of course).

Re: Show HN: We put an iPhone on the front wheel of a car

#66

Post by WalterBright »

jacquesm wrote: post #49
petrakeas wrote: post #32

Earlier quoted context omitted.

Developer of the app here. One step ahead of you ;) http://imgur.com/tdnympM

I hope you're joking. If you do plan on doing this then please do it in a suitably strong wire cage, power it on remotely, make sure it is tied down very solidly and make sure nothing you care about (including you, significant others, co-workers, children, pets, possessions etc) is in the plane of rotation because this will fail spectacularly. Keep in mind that if the grinder becomes dislodged or unbalanced that the…

I had an angle grinder disk shatter on me. It didn't hit me, but the force with which it blew was pretty startling.

Yes, I always wear eye goggles with it.

Even so, don't use a grinder without the metal guard, and still try and keep your body parts out of the plane of its rotation.

Re: Show HN: We put an iPhone on the front wheel of a car

#67

Post by [deleted] »

petrakeas wrote: post #32
btbuildem wrote: post #25

Kudos to you guys for trying to solve the VVS problem! For your second experiment, may I recommend attaching the iphone to the disc of a variable-speed angle grinder? You'll get a much larger range of speeds, as well as the ability to aim the camera freely. You'll be able to test how your accelerometer algos handle pitch and yaw IN ADDITION to centrifugal force!

Developer of the app here. One step ahead of you ;) http://imgur.com/tdnympM

[deleted]

Re: Show HN: We put an iPhone on the front wheel of a car

#68

Post by NAFV_P »

binarymax wrote: post #2

I have some serious sea legs and almost never get motion sickness. The fullscreen youtube vid got me. Great experiment.

The video did make me feel quite queasy, but it is not as bad as Descent [0].

[0] http://en.wikipedia.org/wiki/Descent_(video_game)

Re: Show HN: We put an iPhone on the front wheel of a car

#69

Post by kenjackson »

Goosey wrote: post #18

I found this to be really incredible. That is some amazing video stabilization technology. If this app was available for android I think I would use it for every video capture I ever do.

I found this to be really incredible. That is some amazing video stabilization technology. If this app was available for Windows Phone I think I would use it for every video capture I ever do.

(I'm really hoping for the same response that the Android guy got!)

Re: Show HN: We put an iPhone on the front wheel of a car

#70

Post by Retric »

jotm wrote: post #64
Retric wrote: post #59

Earlier quoted context omitted.

11k RPM is not as fast as you might think. That 660,000 RPH * ~8 inch diamiter circle. So outer edge is 3.14*8inch/12/5280 ~= .0004 miles per revolution or 260MPH. But the center is stationary so actual force is a little less than you can throw it. Edit: Camera is not centered on the iPhone. So if you center the camera it's worse than that. I would personally not stand anywhere near it.

Have you never used a small 11k angle grinder? Those things try to jump out of your hand even worse than the big 6k RPM ones (without soft-start, of course).

I have used a 11k RPM grinder, not that I would have called it small the thing was like 10 pounds. So, I can can see how they might be harder control with newer motors and swapping steal for plastic.

Backing up, being safe with power tools is IMO more a mindset than a set of safety equipment. As such you need some understanding of the forces involved. Not, just to be safe right then but so you don't get lulled into a false concept of safety because the overblown worst case you picture did not happen.

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