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

Tweets

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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    1. Venkatesh Rao‏ @vgr Sep 8
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      All long-term value is built from the follow-through part of short-term habits. Follow-through as in golf swings not as in delivering on commitments. It’s respecting the momentum of every atomic action that produces natural “extra” effects relative to immediate needs.

      2 replies 6 retweets 83 likes
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    2. Venkatesh Rao‏ @vgr Sep 8
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      Writing up notes after meetings is one of the very few I’ve managed to stick to. Brief cues during, detailed notes after, review before next meeting. Turns a staccato thread of though with lots of rework/redundancy into a smooth stream.

      1 reply 1 retweet 39 likes
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    3. Venkatesh Rao‏ @vgr Sep 8
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      When it works well, clients don’t actually notice. It just looks like I’m on the ball, keeping up with situation and maintaining state. I send them the notes, which they like, but many don’t appreciate this particular effect. It’s only when thread breaks that it’s noticeable.

      1 reply 1 retweet 21 likes
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    4. Venkatesh Rao‏ @vgr Sep 8
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      (Which is rare... I’m occassionally late, but almost never skip) Playing with gears again after a long time, it strikes me that involute gear tooth profiles are all about follow-through and smoothness. https://en.wikipedia.org/wiki/Involute 

      1 reply 2 retweets 11 likes
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    5. Venkatesh Rao‏ @vgr Sep 8
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      Unlike primitive gears, involute profiles maintain continuous contact between 2 gear tooth faces and allow next tooth to pick up where previous tooth leaves off. That’s why well-designed gears can be very quiet compared to noisy primitive ones.pic.twitter.com/x2tk8kNv2G

      3 replies 6 retweets 35 likes
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    6. Nick Parker‏ @NickParkerPrint Sep 8
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      Replying to @vgr

      Fun fact: Involute gears are not the unique solution to this! You're describing the 'fundamental law of gearing' which says the angular velocity of both gears must be constant throughout the mesh. What's special about involutes is they obey it over a range of center distances.

      1 reply 1 retweet 13 likes
    7. Nick Parker‏ @NickParkerPrint Sep 8
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      Replying to @NickParkerPrint @vgr

      Cycloid gears obey the law as well, but only for an exact center distance which is hard to provide in most applications. They're easier to make though, so they're used a lot in watchmaking https://en.wikipedia.org/wiki/Cycloid_gear …

      1 reply 1 retweet 6 likes
    8. Nick Parker‏ @NickParkerPrint Sep 8
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      Replying to @NickParkerPrint @vgr

      The wildest solution to the law IMO is Wildhaber-Novikov gearing. The tooth profile is an exterior circular arc on one gear and interior on the other which definitely *doesn't* uphold the law, but then you make both gears helical and suddenly it works! https://www.geartechnology.com/articles/0115/Non-Involute_Gearing,_Function_and_Manufacturing_Compared_to_Established_Gear_Designs/ …pic.twitter.com/0DnjheCDKC

      2 replies 3 retweets 17 likes
      Venkatesh Rao‏ @vgr Sep 8
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      Replying to @NickParkerPrint

      You’re clearly the right person to ask: what’s the best way to get going with 3D printing gears? I have a small entry-level printer and just getting comfy with OnShape. In my ME drawing classes ~93, I only drew sample gear profiles on paper and never learned to do them in CAD

      11:32 AM - 8 Sep 2020
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      • James Giammona ifrit Nick Parker
      4 replies 0 retweets 3 likes
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        2. Venkatesh Rao‏ @vgr Sep 8
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          Replying to @vgr @NickParkerPrint

          I have a few ideas for projects that will require gears. My Everest project would be an equatorial mount gearbox for a telescope.

          2 replies 0 retweets 2 likes
        3. Varun Adibhatla‏ @vr00n Sep 8
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          Replying to @vgr @NickParkerPrint

          Came across this wild youtube channel with tons of gears and crank animationshttps://youtu.be/oHQ4ZaiRbgc 

          2 replies 0 retweets 2 likes
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        2. Nick Parker‏ @NickParkerPrint Sep 8
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          Replying to @vgr

          Hah thank you! The unfortunate answer is that Autodesk Inventor's gear generator is the best I've used, but you do *not* want to buy that software lol

          1 reply 0 retweets 0 likes
        3. Nick Parker‏ @NickParkerPrint Sep 8
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          Replying to @NickParkerPrint @vgr

          Matthias Wandel (AWESOME youtube btw) has this program I've used https://woodgears.ca/gear/index.html  that's full featured and technically correct, but IIRC was a little bit of a pain to get imported into real CAD packages at the correct scale and such.

          1 reply 0 retweets 2 likes
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        2. Nick Parker‏ @NickParkerPrint Sep 8
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          Replying to @vgr

          Also if you'd like mechanical device design superpowers, read through Fundamentals of Design by Prof Slocum: https://meddevdesign.mit.edu/fundamentals-of-design/ … It's got alternating summary / in depth pages so it's super light reading, and it's contributed more to my skills than my undergrad by FAR

          1 reply 1 retweet 15 likes
        3. Adolf Richter Brill  🐮‏ @typhoonjim Sep 8
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          Replying to @NickParkerPrint @vgr

          This is absolutely amazing. I saw something in here just glancing at it for a second that is applicable to a current work issue.

          1 reply 0 retweets 2 likes
        4. Show replies
        1. Chenoe Hart‏ @chenoehart Sep 8
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          Replying to @vgr @NickParkerPrint

          When I was making gears I downloaded some pre-made 3D models in standard gear sizes from Thingiverse, and then customized the axle connections which they used.

          0 replies 0 retweets 2 likes
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