153 karma · joined June 11, 2015
Related, I'm very impressed by his speed. I ride about 9 miles to and from work and it takes me ~35-40 minutes door to door.
I'm frequently disappointed by really good ideas that could be presented in a dozen pages being stretched to occupy 200 (e.g. Deep Work)
The wheels allowed some neat driving tricks, but it also made it really difficult to drive in a straight line. You don't get the normal tracking behaviour that wheels give you, and differences in traction from wheel to wheel also tend to distort your course. Adding a gyro for use in a closed-loop angular control system really helped this a lot.
[1] https://en.wikipedia.org/wiki/Omni_wheel [2] http://willbeattie.ca/Projects/Twitch/Twitch.html
Do the steppers have encoders on them? If not, the machine can't do closed loop control. It can keep track of where the rotor should be based on counting the steps of coils it has energized, but it has no way of directly keeping track of the rotor. A large enough torque resisting the rotor's rotation can cause the rotor to skip steps, but this doesn't influence the energizing of coils in the stator so the machine has no idea that anything has gone wrong.
An encoder lets you directly measure what's going on with the rotor (and therefore the shaft of the motor). You basically keep track of where you should be (based on counting the steps delivered to the stator coils) then use the encoder to validate. e.g. 'I've sent 12 steps so I should be 48 degrees from where I started. My encoder is reading 26 degrees, so I must have skipped steps somewhere along the way.'
https://www.sciencedaily.com/releases/2011/03/110307130215.h...
I was mostly trying to address the direct cause-and-effect conclusion the parent comment was making with breathing hard == losing weight
So yeah, it's definitely top of mind if you're riding on those streets, but there are things you can do to mitigate risk down to a level that's acceptable for me. For the record I live in Toronto, drive to work, all other trips are on my bike unless there's snow on the ground.
Q1: Medicaid co-pay for $1000 worth of OxyContin was (as of ~2014, might still be) on the order of $3-5. Those unable to get prescriptions fence stolen goods, primarily from rural WalMarts
Q2: Opiods are chemically similar to heroin. Addiction is severe and enslaving. Someone who wouldn't get off the couch to throw out the trash will walk miles in a snowstorm to get their fix.
Pushing a guy out of bounds (e.g. a two handed shove) is an illegal tackle in rugby. You have to attempt a normal tackle, and basically attempt to force him out of bounds in the process if that's your goal.
I remember clearly being called for this (didn't know the rule at the time) when I was trying to prevent someone from scoring while he was running close to the sidelines. The ref called a penalty try on me for it.
[1] http://lakewoodhiker.blogspot.ca/2012/04/2012-barkley-marath...
[1]https://www.bloomberg.com/news/articles/2014-03-03/advertisi...
a) The design of the block has been perfected through years other people's work and experience. If I need a spur gear in a design there's almost certainly an off-the-shelf component that's 99% perfect.
b) I'm in a rush and I need something good enough. Slap something down and move on.
In the context of writing it seems like the latter will pop up more often. Did his examples seem trite to anyone else?
What do you think Tyler's goal was in that movie? His fight club -> project mayhem plan seemed to go off the way he wanted it to. If you think he wanted to promote that free-your-mind, reset-the-score, you-are-not-your-possessions ideology, that desire seems to fit with the fact that he's the alter-ego of Norton's unfulfilled white collar weakling character. But you lay out pretty convincingly that Project Mayhem is more of a trick, trading one kind of prison for another. What would compel Norton's alter-ego to play such a trick?
“We put a sign on over the front door of the iPhone building that said FIGHT CLUB,” Forstall testified. “Because the first rule of fight club is that you don’t talk about fight club.”
I found this bit wonderfully ironic given the anti-consumerist nature of the movie. Shades of Reagan playing 'Born in the USA' on the campaign trail.