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ACRO System on a Vertical wall

Discussion in 'General Talk' started by shachar weissberg, Jun 30, 2020.

  1. shachar weissberg

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    Hi,
    It is possible to hang the ACRO system vertically on the wall?
    the step motor will handle it?
     
  2. romamaker

    romamaker New
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    If you search around a bit, you'll see where this has been discussed a few times before. But the short answer is yes, it is possible. The one thing you have to watch out for however, is when the motors power off, the gantry will fall/slam to the bottom, potentially causing damage.
     
  3. shachar weissberg

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    thanks for reply,
    I found only one discussion but it barely gives an explanation for this issue.
    max torque of 17 NEMA stepper is 76oz/in (5.47kg/cm) so I guess I can lift ~11kg in the double motor axis.
    Two motor weight 0.7kg (each stepper motor weight 0.35kg) and V-Slot® 20x40 Linear Rail and plates weight ~1kg (my guess didn't see info) for 1500mm
    which leaves us with 1.7kg means we left with 9.3kg for the load.
    am I right?
     
    #3 shachar weissberg, Jun 30, 2020
    Last edited: Jun 30, 2020
  4. JustinTime

    JustinTime Journeyman
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    Shachar, once the motors don't have power they are just free wheeling as the electric brake is not active. If you use lead screws this may not be a problem but if you use a belt system what romamaker said is true.
     
  5. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
    Staff Member Moderator Project Maker Builder Resident Builder

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    NB also keep in mind freewheeling stepper motors become generators that can easily kill stepper drivers. One will have to get into a strong habit of parking it in a "gravity proof" position before turning it off, or add some safety mechanisms like counterweights to stop it dropping down
     
  6. shachar weissberg

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    thanks,
    I understand, so or I'll find a solution for safety (kind of stopper/spring) or maybe i'll try to use lead screws for the gravity axis.

    Is there any reference project which combine pulley-belt system to lead screw?
     
  7. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    One suggestion would be mounting it with the X-axis vertical that way you only have to counter weight one actuator. A constant force spring would also be an option for that axis.
     
  8. JustinTime

    JustinTime Journeyman
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    What Rick suggested is a good idea but then I would consider renaming the X and Y axes so that the 0,0 point will still be on the lower left corner. It may just make it oh so easy in the future having the 0 point in the conventional place.
     

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