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Gearboxes

Discussion in 'General Talk' started by Public Do Omens, Jan 4, 2014.

  1. Public Do Omens

    Guest Builder

    #1 Public Do Omens, Jan 4, 2014
    Last edited by a moderator: Jan 4, 2014
  2. Mark Carew

    Mark Carew OpenBuilds Team
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    Expensive motors at 76 oz of torque for a NEMA 23 must have a very small can, this is close to the same torque for OpenBuilds Part Store NEMA 17 stepper (custom). The NEMA 23 we are hoping to stock soon in the part store will be 12.6 kg.cm or 177 oz torque and will not cost 65 bucks
    I would love to try this out but @ 1pc. - $249.00 its out of park
     
  3. Public Do Omens

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    That is my point! the $65 motor NEMA 23 pulls more then an high end NEMA 17 @a 30% cost.
     
  4. Mark Carew

    Mark Carew OpenBuilds Team
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    Normally the 17's are less expensive than the 23's. Not sure why they have their pricing set up this way.
    We use 17's because they are lighter and smaller and fit right in on most smaller size machine builds. When more torque is needed, we upgrade to the 23's. That's how we do it most of time for most of the builds but I see what you mean and this is a good option when roughly the same torque is needed without concern for weight or space. Thanks for the link :)
     
  5. Public Do Omens

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    Was thinking CNC heavy weight chatter.
     
  6. Mark Carew

    Mark Carew OpenBuilds Team
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    Public Do Omens likes this.
  7. Public Do Omens

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    Gear boxes make the difference to me as i am after very fine tolerances.
    We need to look into what set-ups give what resolution on the primary 3 Axis.
    Then builders would consult a guide to help pick kit.

    Plus what the difference in tolerance is between actuator systems, belt vs rod vs magnetic levitation linear actuator.

    http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=1024605&url=http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=1024605

    http://wonjongkim.tamu.edu/pdf/papers/tia05.pdf

    When you use the latter, weight issues goes away, as mass can be compensated with magnetic fields.
    This is the ultimate linear actuator, why is no one talking about electromagnetic with no motor?.

    We should build these, anyone fancy funding me?
     
  8. Mark Carew

    Mark Carew OpenBuilds Team
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    I have been looking into gear reduction for finer precision in place of going with more micro stepping and/or .09 steppers. It's more of an analog approach and I like what I see so far. Its cheaper to do and allows a range of setups.
    Mag rails are cool but they get expensive as the trap is always better magnets for more forces. They are cool though :)

    You have to set aside a budget for FUNding :D
     
  9. Public Do Omens

    Guest Builder

    US dreamers don't have budgets, leave that to the accountants.

    Money is holding back HUMAN progress, that's why they want to move all the FIAT currency offshore, not to spend.
    Just so the country has less to spend in the pot. They devalue what we have.

    Almost like they want sheep!

    Don't use magnets they need rare earth elements, use electromagnets.
    This is why corporations are purchasing Africa & Spain. Rare Earth elements. Not OIL.

    Only work with power on. Not permanent.

    Don't move a mountain, go to it. Mass is not an issue if you factor it out.

    $0.02
     
  10. Mark Carew

    Mark Carew OpenBuilds Team
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    You make some good points my friend
     
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