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1st 2DOF compact build attempt

Discussion in 'DIY Motion Simulator Projects' started by maligator, Nov 18, 2014.

Page 3 of 4
  1. maligator

    maligator New Member

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    My Motion Simulator:
    2DOF
    Guys, thank you for chiming in. I will be getting these 50:1 crab pot motors: http://www.ebay.com/itm/GEAR-MOTOR-...483?pt=LH_DefaultDomain_0&hash=item51bed470a3

    Are they power hungry enough to need 2x Motomonsters? Also, I agree totally on having spares on hand and will do that.
    maligator, Nov 21, 2014
    #41
  2. Pit

    Pit - - - - - - - - - - - - - - - - Gold Contributor

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    My Motion Simulator:
    DC motor, Arduino, 6DOF
    One MM should handle two motors, but the 12 bucks for the MM are like bird-do :) Take 4 of them (one in reserve and one for traction loss, who knows...) and you will be on the safe side.
    Pit, Nov 21, 2014
    #42
  3. maligator

    maligator New Member

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    maligator, Nov 21, 2014
    #43
  4. RacingMat

    RacingMat Well-Known Member Gold Contributor

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    My Motion Simulator:
    2DOF, DC motor, Arduino
    personnaly, I would only trust Cermet pot which are higher quality...

    I cannot see this item as well...
    RacingMat, Nov 21, 2014
    #44
  5. Pit

    Pit - - - - - - - - - - - - - - - - Gold Contributor

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    My Motion Simulator:
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    • Useful Useful x 1
    Pit, Nov 21, 2014
    #45
  6. maligator

    maligator New Member

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    My Motion Simulator:
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    OK, I'll get the cermet ones then, LOL

    Do they have to have 360* rotation? I found some that have 300*
    maligator, Nov 21, 2014
    #46
  7. Pit

    Pit - - - - - - - - - - - - - - - - Gold Contributor

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    My Motion Simulator:
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    300 or 360 is not the matter, more (or very) important is the fact you have to use the full turn of the pot. How much degrees you pot will have is part of your concept.

    PS: this statement not guilty for hall effect potentiometers.
    Pit, Nov 21, 2014
    #47
  8. Nick Moxley

    Nick Moxley Well-Known Member

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    My Motion Simulator:
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    spend the extra on Hall effects, Cheap Pots yield cheap results.
    • Agree Agree x 1
    • Useful Useful x 1
    Nick Moxley, Nov 21, 2014
    #48
  9. bsft

    bsft

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    Or use expensive wire wound pots, like the $36 each ones I use as well
    • Agree Agree x 1
    bsft, Nov 21, 2014
    #49
  10. Pit

    Pit - - - - - - - - - - - - - - - - Gold Contributor

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    My Motion Simulator:
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    good pots are well-invested money - sooner or later (mostly sooner). cheap post are perishable (or food is perishable, don't know... ;P ) and sometimes the signal is jerky.
    Pit, Nov 21, 2014
    #50
  11. Blame73

    Blame73 Well-Known Member

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    My Motion Simulator:
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    If I understand it correctly at the maximum of the motor I should have the maximum of the pot, right?
    Blame73, Nov 21, 2014
    #51
  12. Pit

    Pit - - - - - - - - - - - - - - - - Gold Contributor

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    My Motion Simulator:
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    better the maximum of the needed turn plus 20% or something around that. My motors can turn endless ;)
    • Informative Informative x 1
    Pit, Nov 21, 2014
    #52
  13. Pit

    Pit - - - - - - - - - - - - - - - - Gold Contributor

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    My Motion Simulator:
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    PS: why using the full turn: Ardunio knows 256 different positions. If you use much less positions, you have less positions for the needed turn, which makes the turn jerky (small steps between the positions). As far I know Pololu (jrks) are using a 10-bit resolution which should make less problems (but not confirmed by me, only hypothetical)
    • Informative Informative x 1
    Pit, Nov 21, 2014
    #53
  14. maligator

    maligator New Member

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    Can you suggest a good pot to look for? Thanks
    maligator, Nov 22, 2014
    #54
  15. Nick Moxley

    Nick Moxley Well-Known Member

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    My Motion Simulator:
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    • Agree Agree x 1
    Nick Moxley, Nov 22, 2014
    #55
  16. maligator

    maligator New Member

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    My Motion Simulator:
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    The two correct power supplies arrived today. Work schedule is tough this week so I'll start to get them modded when it slows down.
    • Like Like x 1
    maligator, Nov 24, 2014
    #56
  17. Nick Moxley

    Nick Moxley Well-Known Member

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    My Motion Simulator:
    2DOF, 3DOF, DC motor, JRK

    Are you planning a kill switch ? I personally went with Killing the power from the PSU which in turn causes an error in the JRK, Stopping any further motion.
    Nick Moxley, Nov 25, 2014
    #57
  18. bsft

    bsft

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    yes, you need to stop the power going to the motors from the jrks, not stop the power going to the jrks
    • Disagree Disagree x 1
    • Informative Informative x 1
    bsft, Nov 25, 2014
    #58
  19. Pit

    Pit - - - - - - - - - - - - - - - - Gold Contributor

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    My Motion Simulator:
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    I think @maligator is using MMs.Killing the power from the PSU doesn't cause any issues.
    Pit, Nov 25, 2014
    #59
  20. Nick Moxley

    Nick Moxley Well-Known Member

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    My Motion Simulator:
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    No difference, Still stops the motion. and I would much rather have 24awg lead wires to control the power of the PSU than have to run 14awg wires off the motor leads to kill the power.
    Last edited: Nov 25, 2014
    Nick Moxley, Nov 25, 2014
    #60
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