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MorlockP's profile
ⓘ Dogs don't have thumbs
ⓘ Dogs don't have thumbs
ⓘ Dogs don't have thumbs
@MorlockP

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ⓘ Dogs don't have thumbs

@MorlockP

Two-time Prometheus award-winning hard science fiction author. https://www.amazon.com/dp/B005JPPMS6  Learn how to homestead https://www.amazon.com/dp/B093BC3K1T 

Aristillus Crater, Luna
amazon.com/dp/B005JPPMS6
Joined June 2012

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    1. ⓘ Dogs don't have thumbs‏ @MorlockP 1 May 2017
      Replying to @MorlockP

      12/ construction with a straightedge and a compass. I've got a vague memory that the first high precision thread was hand made near perfect

      1 reply 0 retweets 4 likes
    2. ⓘ Dogs don't have thumbs‏ @MorlockP 1 May 2017
      Replying to @MorlockP

      13/ along a 1" or 2" length and then this was used as a lead screw in a lathe, thus allowing it to self replicate along length of workpiece

      1 reply 0 retweets 2 likes
    3. ⓘ Dogs don't have thumbs‏ @MorlockP 1 May 2017
      Replying to @MorlockP

      14/ but I can imagine the existence of other techniques. For example, the surveyor's transit is simple, but amazingly cool.

      1 reply 0 retweets 2 likes
    4. ⓘ Dogs don't have thumbs‏ @MorlockP 1 May 2017
      Replying to @MorlockP

      15/ Picture a tripod with a flat platen on top, engraved with degree markings. Then a telescope pivots atop that. Scope has indicator arrow

      1 reply 0 retweets 2 likes
    5. ⓘ Dogs don't have thumbs‏ @MorlockP 1 May 2017
      Replying to @MorlockP

      16/ Naively, I aim scope at church steeple #1, note degrees, then aim at steeple #2, note degrees, subtract, find angle.

      1 reply 0 retweets 2 likes
    6. ⓘ Dogs don't have thumbs‏ @MorlockP 1 May 2017
      Replying to @MorlockP

      17/ Problem is that precision is gated by the crispness of the incised angle marks on the platen. Not even talking accuracy in layout!

      1 reply 0 retweets 2 likes
    7. ⓘ Dogs don't have thumbs‏ @MorlockP 1 May 2017
      Replying to @MorlockP

      18/ Just noting that on a 1' dia circle, the width of the chisel incised layout ticks is very noticeable. 1/2 ° or more!

      1 reply 0 retweets 2 likes
    8. ⓘ Dogs don't have thumbs‏ @MorlockP 1 May 2017
      Replying to @MorlockP

      19/ I ran into exactly this when tramming in Bridgeport's head: head has angle markings. Setting it at 0° is just the start of the process

      1 reply 0 retweets 2 likes
    9. ⓘ Dogs don't have thumbs‏ @MorlockP 1 May 2017
      Replying to @MorlockP

      20/ So how does a surveyor's transit do its magic? The platen can rotate and there is a second indicator. Hand wavingly, you lock scope

      2 replies 0 retweets 2 likes
    10. ⓘ Dogs don't have thumbs‏ @MorlockP 1 May 2017
      Replying to @MorlockP

      21/ to platen, rotate both, lock platen to base, unlock scope, pivot scope back to target, repeat. You're basically measuring same angle >

      1 reply 0 retweets 2 likes
      ⓘ Dogs don't have thumbs‏ @MorlockP 1 May 2017

      22/ 10 times, and thus your 21° angle is measured as 210° degrees. You divide by 10...and your ERROR is divided by 10 as well.

      6:27 AM - 1 May 2017
      • 2 Likes
      • Vague & Candid Mark Corrigan, Esq.
      3 replies 0 retweets 2 likes
        1. New conversation
        2. ⓘ Dogs don't have thumbs‏ @MorlockP 1 May 2017
          Replying to @MorlockP

          23/ So that's the magic: a process that lets the signal stay at full strength by adding it in 10 times, but gaussian error self cancels.

          1 reply 0 retweets 3 likes
        3. ⓘ Dogs don't have thumbs‏ @MorlockP 1 May 2017
          Replying to @MorlockP

          24/ ...and that's the kind of process I'm wondering about re threads: is there a way to (a) deterministically create it f() = g() = h()

          1 reply 0 retweets 2 likes
        4. Show replies
        1. nzc‏ @ngvrnd 1 May 2017
          Replying to @MorlockP

          Go on, son- unroll them loops. Unroll 'em!

          0 replies 0 retweets 1 like
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        1. Kevin Twitty‏ @KJTwitty 1 May 2017
          Replying to @MorlockP

          (apologies for being *that guy*), but survey process also has self checks with constant backsighting and loop closure to gauge total error

          0 replies 1 retweet 3 likes
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