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Hex Crawler with SX/B — Parallax Forums

Hex Crawler with SX/B

John R.John R. Posts: 1,376
edited 2006-09-01 19:35 in Robotics
I'm considdering the purchase of either the Hex Crawler or Nomad (3 DoF Legs) and wondering if anyone has run these with SX/B?· I'd anticipate using the PSC, but also want to work with alternate gates, and also keeping the "platform" level on uneven terrain.

Any thoughts?


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John R.

8 + 8 = 10

Comments

  • AImanAIman Posts: 531
    edited 2006-09-01 16:37
    As for keeping the platform level - are you wanting to do that literally or via use of software?

    My answers below incorporate both with the first being strickly mechanical.

    ·· 1)·Look making a curved rail with a weighted bottom held in place by shocks from an rc car. Reason being if weight is more then the shocks can hold the shocks will adjust slowly to the curve giving a smooth transition to level. The weight will keep it centered and its pretty easy to make.

    ·· 2)Get a gear like a toothed belt, fasten it to a curved·rail and run motors on either side or a single motor for both sides. Put an acceleramoter (sp?) on it so the computer knows if its moving and then have the motor adjust the platform resting on the curved rail so it stays level.

    ·· 3)·Get a plastic gear big enough to fasten a platform onto and mount that on an axel so the whole thing rototes. Then your motor would simply turn the gear as the acceleramoter dictates.·You could even run a perpendiclaur gear and use a dual axis acceleramoter to counter both front to back and side to side.

    Sorry, can't help with an answer to SX/B.

    Post Edited (AIman) : 9/1/2006 4:41:54 PM GMT
  • John R.John R. Posts: 1,376
    edited 2006-09-01 17:40
    As far as keeping level, my desire is to have the legs compensate as much as possible, not moving the platform.

    In concept:
    • An accelerometer would be used to sense any "out of level" tilt.
    • The legs on the low side(s) would extend further
    • The legs on the high side(s) would "crouch" more
    • If limits were reached, it would not try and "over compensate"

    The CrustCrawler products come with a BS2p24 (if you get the "complete" kit).· I've been gravitating toward SX on couple other projects at home as part of a progression from Pbasic to SX/B and eventually at least some Assembly (just for giggles).· The Propellor may be another alternative, and may make more sense.

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    John R.

    8 + 8 = 10
  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2006-09-01 19:01
    The First Prize winner of the 2004-5 SX Design Contest was a Hexcrawler, but programed in Assembly.

    You may want to look at the code and contact Andrew Miller.· His version has R/C control.


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    "If you want more fiber, eat the package.· Not enough?· Eat the manual."········
    ···················· Tropical regards,····· G. Herzog [noparse][[/noparse]·黃鶴 ]·in Taiwan
  • John R.John R. Posts: 1,376
    edited 2006-09-01 19:35
    That certainly answers the questions smile.gif

    Kramer: Thanks for the pointer. On looking at this, I remember seeing it before when looking at the contest winers. I think some of us forget all the "hidden" sources of treasure like the contest winners and customer projects area.

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    John R.

    8 + 8 = 10
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