Welcome to Our Community

Some features disabled for guests. Register Today.

Project 3D Printed Hand Wheel for Openbuilds 8mm Tension Nut 1.0

3D Printed Hand Wheel for Openbuilds 8mm Acme Leadscrew Tension Nut

  1. Forestbird Originals

    Builder

    Joined:
    May 6, 2019
    Messages:
    19
    Likes Received:
    4
  2. JustinTime

    JustinTime Veteran
    Builder

    Joined:
    Dec 18, 2013
    Messages:
    756
    Likes Received:
    252
    Do you find you need to retension the screw every now and then or is it for a one time tension and then it is removed?
     
  3. Tim Waldvogel

    Builder

    Joined:
    Oct 11, 2020
    Messages:
    19
    Likes Received:
    0
    This actually isn’t specifically for tensioning, this is used on top of the tension nut after tensioning specifically for manually jogging the machine by hand. I found that it was useful while building my machine to get the 2 axis aligned at 0 and for moving it if it got out of alignment
    It is your choice whether you want to keep it on the machine or not :)
     
  4. Peter Van Der Walt

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

    Joined:
    Mar 1, 2017
    Messages:
    13,751
    Likes Received:
    4,070
    Careful, turning stepper motors by hand turns them into generators, backfeeding the stepper drivers, and can damage the drivers
     
    Tim Waldvogel likes this.
  5. Tim Waldvogel

    Builder

    Joined:
    Oct 11, 2020
    Messages:
    19
    Likes Received:
    0
    Yes you are correct. These were designed for correcting out of squareness that happens over time. Since the Y motors are linked in software, this would have to be done by hand.

    Damage is only done if you move them too fast, which is almost impossible with a handwheel and lead screw. This is mostly for regularly fixing out of squareness that happens. This is a very common setup for leadscrew designs.

    You are not wrong though, if you crank them really fast you could generate enough back voltage to damage the drivers. More than likely you couldn't turn them synchronous enough with 2 hands to prevent it from locking up due it becoming skewed and jamming up.
     
  6. JustinTime

    JustinTime Veteran
    Builder

    Joined:
    Dec 18, 2013
    Messages:
    756
    Likes Received:
    252
    I think you underestimating the voltage generation a bit, Tim, but the best way to verify it is to hook up a volt meter to any pair of the motor wires and crank it. If you happen to do it, please post it since I'm curious too to know the exact amount.
     
  7. Peter Van Der Walt

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

    Joined:
    Mar 1, 2017
    Messages:
    13,751
    Likes Received:
    4,070
    Multimeters "average" so short pulses look lower. Oscilloscope rather. Remind me on Monday, i can actually set that up. Would make a cool demonstration
     
    Tim Waldvogel likes this.
  8. Christian James

    Christian James Journeyman
    Builder

    Joined:
    Jun 8, 2018
    Messages:
    434
    Likes Received:
    210
    If my Y axes are out of sync, I just tweak (turn) one of the Y flexible couplings to correct it - power off and motor disconnected obviously.
     
    Peter Van Der Walt likes this.
  9. Tim Waldvogel

    Builder

    Joined:
    Oct 11, 2020
    Messages:
    19
    Likes Received:
    0
    Please do. I would be interested to know how much voltage\Amps are generated. I move mine less than an inch in most cases. Ill just undo my aviation connectors if I have to. But it seems crazy when I do this all the time on my 3d printer with larger NEMA 17's and move it 2 or 3 inches at faster paces than this handwheel could do with a motivated person.
     
  10. Tim Waldvogel

    Builder

    Joined:
    Oct 11, 2020
    Messages:
    19
    Likes Received:
    0
    Power off should be obvious, I wouldnt square a machine with it on unless I had 2 endstops to do it for me.
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice