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vgr's profile
Venkatesh Rao
Venkatesh Rao
Venkatesh Rao
@vgr

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Venkatesh Rao

@vgr

Conversational account. For work follow @ribbonfarm, @breaking_smart, @artofgig. Tweets are 90% vacuous views, apathetically held. Mediocritopian. IKEA builder.

Los Angeles, CA
venkateshrao.com
Joined August 2007

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    Venkatesh Rao‏ @vgr Sep 5
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    Finished assembling my clock but it stops after like 5 tick ticks 😖pic.twitter.com/S6Ul6pJI9U

    4:19 PM - 5 Sep 2020
    • 6 Retweets
    • 135 Likes
    • roddur wants to dunk DAVID SUGARMAN Daniel Kuhn Tyler DIR DIN Michal Kašpárek Avi Bhuiyan Jeff James Giammona 𝚌𝚊𝚛𝚛𝚘𝚣𝚘 🟡
    13 replies 6 retweets 135 likes
      1. New conversation
      2. Venkatesh Rao‏ @vgr Sep 5
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        It’s a very sensitive leveling issue now. I’m up to 30s continuous ticking.pic.twitter.com/1nLEfirVTG

        4 replies 0 retweets 21 likes
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      3. Venkatesh Rao‏ @vgr Sep 5
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        The leveling mechanism is kinda silly: a set of four pairs of wooden lifting pegs. The instructions tell you which side to raise depending on where the tooth on the escape wheel stops relative to rocker. I’m using sheets of paper to adjust. Gonna add leveling scenes instead.pic.twitter.com/RoL4LMostF

        2 replies 0 retweets 8 likes
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      4. Venkatesh Rao‏ @vgr Sep 5
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        Ok got up to 45 seconds. Now I know what the problem is. I’m calling this project done and triggering a new one: Project Clock Leveling. 3d printed shoes with leveling screws screw for the clock may be involved.

        3 replies 0 retweets 14 likes
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      5. Venkatesh Rao‏ @vgr Sep 5
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        For those interested, a buddy of mine in grad school wrote a paper on the control mechanism of clock escapements. It is surprisingly complex.https://www.tandfonline.com/doi/abs/10.1080/00207170310001632412 …

        1 reply 0 retweets 18 likes
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      6. Venkatesh Rao‏ @vgr Sep 5
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        Mechanical clocks are among the technologies that are easier to build in practice than model and theorize.

        2 replies 0 retweets 24 likes
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      7. Venkatesh Rao‏ @vgr Sep 5
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        Fascinating that the tick-tick sound is different depending on the level adjustment. It is most pleasantly symmetric in an aural sense when it is most level.

        2 replies 0 retweets 10 likes
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      8. Venkatesh Rao‏ @vgr Sep 7
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        Still trouble-shooting this. The gear train is now fine. Goes brrr when I disengage the pendulum rocker. The mainspring drive mechanism is really quite beautiful. The rocker is delicately balanced to both stop it rom going brrr and get energy from it.pic.twitter.com/RSfEAdygGr

        1 reply 0 retweets 12 likes
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      9. Venkatesh Rao‏ @vgr Sep 7
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        I think the rocker is poorly aligned due to a plane offset error. Which I made worse during my disengagement test. The contact has to generate enough force to overcome rocker contact friction.pic.twitter.com/1dX1YCzjev

        1 reply 0 retweets 6 likes
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      10. Venkatesh Rao‏ @vgr Sep 7
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        I don’t think it’s a leveling error now since I can get it to about 30s ticking in either direction.

        1 reply 0 retweets 6 likes
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      11. Venkatesh Rao‏ @vgr Sep 7
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        Up to 55 seconds now. If I can beat this plane alignment I think I’m good.

        1 reply 0 retweets 6 likes
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      12. Venkatesh Rao‏ @vgr Sep 7
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        1 minute 40 seconds!

        1 reply 0 retweets 7 likes
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      13. Venkatesh Rao‏ @vgr Sep 7
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        Okay, over 5 minutes... it was the contact offset. It’s basically solved now. The pendulum/rocker was off by like 3 mm along its axle. We’re in continuous ticking now. Need to fine tune a bit but the leveling is not that sensitive. With the proper contact it goes long.

        1 reply 0 retweets 14 likes
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      14. Venkatesh Rao‏ @vgr Sep 7
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        It’s been going for 15 minutes now *looking around super-impressed with myself* Wtf. Pendulum regulated gear trains driven by mainsprings are an amazing invention. Now I want to do more with this idea.

        3 replies 0 retweets 21 likes
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      15. Venkatesh Rao‏ @vgr Sep 7
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        Stopped after half an hour because a gear axis slipped out of sleeve and then wouldn’t start up again properly. Turned out it’s wound down too much with all this tinkering so had to rewind. Ticking again. Once I get it going for a full spring winding cycle I’ll work on accuracy.

        1 reply 0 retweets 8 likes
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      16. Venkatesh Rao‏ @vgr Sep 7
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        What’s really clever is that the contact forces generated by a 1s pendulum would be too weak to directly compete with a powerful mainspring. But the ~ 2 orders of magnitude gear reduction creates enough mechanical advantage that the 1s pendulum can regulate it

        1 reply 0 retweets 5 likes
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      17. Venkatesh Rao‏ @vgr Sep 7
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        Ie the gear down to generate minutes/hours to tell time is also what creates the leverage to control the dynamics. The range this trick works goes from Big Ben to desktop size. And then you switch to a balance wheel oscillator instead of gravity, to go down to wristwatch size.

        1 reply 0 retweets 5 likes
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      18. Venkatesh Rao‏ @vgr Sep 7
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        I’ll write this up as part 2 of my clockmaking blogchain, here’s part 1. Highly recommend this ROKR kit. Commune with Galileo and Huygens for under 50 bucks.https://www.ribbonfarm.com/2020/08/13/clockmaking-1/ …

        2 replies 1 retweet 23 likes
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      19. Venkatesh Rao‏ @vgr Sep 16
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        Today, for the first time, it’s been going continuously for over an hour without stopping, after some fairly brutal microsurgery on the gear train. Sometimes you gotta brute force this shit a bit

        2 replies 0 retweets 11 likes
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      20. Venkatesh Rao‏ @vgr Sep 16
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        2 hours and counting. Holy crap there’s a small chance this will run a full 24h. Afaict I’ve bullied all the frictions into submission. Fingers crossed 🤞

        2 replies 0 retweets 14 likes
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      21. Venkatesh Rao‏ @vgr Sep 16
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        3 hourspic.twitter.com/W1Oskyz4jj

        1 reply 0 retweets 8 likes
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      22. Venkatesh Rao‏ @vgr Sep 16
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        Since it's a mechanical clock, 12 hours is the full cycle test. If it makes it past 12, there's no sticky bits anywhere in the gear train. Interesting... just hit me that since such clocks are typically meant to be wound every day, each windup is n=2 full cycles.

        1 reply 0 retweets 8 likes
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      23. Venkatesh Rao‏ @vgr Sep 16
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        If it makes it, I'll do a final light tightening of all wobbly bits, maybe paint some fluorescent numbers on the dials and hands, and put it up on a shelf.

        2 replies 0 retweets 8 likes
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      24. Venkatesh Rao‏ @vgr Sep 16
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        Dammit. Stopped at 4.5h. And now cat is rubbing aggressively against table it’s on. Not out of the woods yet.

        1 reply 0 retweets 7 likes
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      25. Venkatesh Rao‏ @vgr Sep 16
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        I'm going to have to resist the temptation to fight this endlessly. I mean this is laser-cut wood, push-fit assembled. Still, getting it to run a full spring-wind-down seems like not too much to ask. I don't need perfection. Just outlast the unwind.

        1 reply 0 retweets 4 likes
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      26. Venkatesh Rao‏ @vgr Sep 16
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        Rube Goldberg Chindogu idea... attach an arduino meta-control loop that notices if it stops via optical sensor interrupted by the pendulum, and gives the rocker a li'l kick if it does

        1 reply 0 retweets 7 likes
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      27. Venkatesh Rao‏ @vgr Sep 16
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        I think the cat is jealous of the clock

        1 reply 0 retweets 5 likes
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      28. Venkatesh Rao‏ @vgr Sep 16
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        Anyone who gets this kit built and ticking smoothly on first attempt is some sort of mechanical genius. I’ve gone: 10s, 30s, 55s, 5 minutes, 25 minutes, 55 minutes, 4.5 hours, and now back to 20-30 min range. I suspect it’s the spring force wind-down.

        1 reply 0 retweets 4 likes
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      29. Venkatesh Rao‏ @vgr Sep 16
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        Yup. Rewound to full tightness and it’s going steadily again. I may be down in the noise zone of friction. It’s not a specific sticking point. To test this, I’d have to note all gear positions at each stall. Should be uniform random?

        1 reply 0 retweets 2 likes
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      30. Venkatesh Rao‏ @vgr Sep 16
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        I’ll measure this, but after first stall at 4:30, with each gentle impulse on rocker it went for a shorter interval each time. By the time it was ~1 minute, strength of initial impulse was determining the duration so pendulum was driving, not spring.

        2 replies 0 retweets 2 likes
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      31. Venkatesh Rao‏ @vgr Sep 16
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        I’m sciencing the shit out of this problem that Huygens cracked in 1658 😎 Bringing up the rear of the scientific revolution like a boss.pic.twitter.com/njIIgjGPrP

        3 replies 0 retweets 10 likes
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      32. Show replies

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