6wire 2phase 5Volt Steppers With Tiny G

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  • April 24, 2021 at 11:04 pm #11963
    akfreak
    Member

    Is it possible to wire a 6 wire 2 phase 5 volt stepper to a tinyG v8 or v9? I have both boards and I have been saving them for a CNC project. I built a OXCNC for a fella about 6 maybe 7 years ago. Now I am trying to retrofit an old H square Champion engraver. This frame, ball screws and bed are amazing, it has expensive Steppers and an awesome power supply, but the controller and computer was way outdated. 5.25 floppy’s and Amber monitor. Nope, this baby is getting a new heart and I can’t wait to feed it some code.

    Thanks for your time, Tom Shue

    April 24, 2021 at 11:32 pm #11964
    Zootalaws
    Member

    It’s the same as wiring any 6-wire to an aA4988

    This covers it.

    https://www.mischianti.org/2019/04/08/how-to-reuse-4-wire-and-6-wire-stepper-motors-for-your-projects/

    April 25, 2021 at 7:26 am #11965
    cmcgrath5035
    Moderator

    Here is another reference discussion
    “https://www.geckodrive.com/support/step-motor-basics/motor-wiring.html”
    As best I can tell, it leads you to the same endpoint as the first posting, which is to float the center taps and treat them as 4wire motors.

    Once you have movement, you will have to experiment to determine the step angle(steps per revolution), assuming you can’t find a spec sheet.

    • This reply was modified 3 years, 8 months ago by cmcgrath5035.
    April 25, 2021 at 11:54 pm #11967
    akfreak
    Member

    Thanks, I did read about wiring them in such a way to only use 4 wires. I would already be testing everything, but I need to ID a lead screw and buy a new one as the one in this machine is worn out, the threats are sharp in the middle section of the lead screw. So I need to replace it and an anti backlash nut with triangle mounting face

    April 26, 2021 at 6:22 am #11968
    cmcgrath5035
    Moderator

    Good luck with your project

    July 1, 2021 at 9:46 pm #11987
    akfreak
    Member

    Al right, I have my leadscrew installed and I have identified the center taps on each stepper motor. I verified the taps by measuring the resistance of the full coil 8.4 ohms and when intest the center tap I hey 1/2 the resistance. Whoo hoo, this project is moving forward at a snails pace. It took forever to find this unicorn of a lead screw and it was EXPENSIVE!

    Anyways, my tinyG has been sitting for years, should I FW update it before I get started or just give it a rip.

    July 2, 2021 at 11:33 am #11988
    cmcgrath5035
    Moderator

    $fv=440.20 should get you going
    http://synthetos.github.io/

    July 5, 2021 at 11:44 pm #11989
    akfreak
    Member

    Im all updated and want to confirm that my steppers are good to go. They are Dc5.5v 1.25a. I know there os a current adjustment for each stepper, but I didnt see the actual voltage window/recommendations. I have to assume that 5.5V is all good

    Lastly, whatever happened to the V9 project?

    July 8, 2021 at 5:43 pm #11990
    cmcgrath5035
    Moderator

    Steppers sound fine. Those are essentially static measurement, if you pass 1.25A DC, the winding voltage will be 5.5V. Stepper drivers pulse current through the winding’s, e.g. 30V for 50ms at a time. You trim the tinyG POTS to move your machine adequately.

    See https://github.com/synthetos/TinyG/wiki/TinyG-Tuning

    V9 was dropped in favor of a 5 axis board with more modern drivers and a much more capable microcontroller. They are in final beta test

    See https://github.com/synthetos/g2/wiki/gQuintic-Specs

    July 9, 2021 at 9:10 pm #11991
    akfreak
    Member

    That new board looks amazing. I guess ill have to build another project, one with 5axis to see what tje board cam do.

    So what should I do with the V9 board?

    July 11, 2021 at 3:27 am #11992
    akfreak
    Member

    Ok. I got everything wired up and I camnuaing Coolterm to test it out. X and y move as they should, z however does not rotate, but it does look like the brakes are on. Also the X axis locks but Y does not lock into place. Also when I send code to y it sounds like a small air leak (best I can describe) in the x and y axis steppers. To me that’s crazy. I tripped checked the wiring but it’s almost 3am and I’m super tired, I’ll.check again in the morning. Also z got hot.so I tired down the current. Z is half the size of z&y steppers

    July 12, 2021 at 11:31 am #11995
    cmcgrath5035
    Moderator

    Z axis – can you freely rotate the Z axis lead screw with power off? with some z axis mechanisms, its easy to misalign and lock them up. That would lead to heating.
    Y axis – when you say it does not lock in place, do you mean it does not hold position when you move just X?. Do you get the same hissing (air leak) sound when you hit the reset button? On reset, all steppers that have $_pm=2 will be “in-cycle” for $mt seconds to hold the current position. Depending on stepper motor design, the could sound like an air leak.

    the V9 prototype will work well for a 4 axis task until something dies. There are many V9 prototypes out there so I would expect the G2 compiles to include the V9 binary, or you could compile your own.
    the gQuintec is really aimed at 3D printer applications and has some enhanced I/O and hi power control for heat beds and the like.
    But building a 3D machine from scratch is way beyond the scope of this forum.
    That said, if you have need for 5 axis control, gQuinctec might be a good choice.

    July 14, 2021 at 1:14 am #12005
    akfreak
    Member

    I made 3 posts and it says duplicate but nothing is showing up?

    July 14, 2021 at 1:15 am #12006
    akfreak
    Member

    Link to video of the problem

    July 15, 2021 at 4:45 am #12007
    akfreak
    Member

    The video shows that when I rotate the y axis both Z and Y move, but then I send a command to Z alone nothing moves but all of the steppers lock into place. I assume there is some sort of motor mapping (initial setup/configuration) that defines motor 1,2,3, and 4 as individual motors. I set one of these up before and I didnt run into this problem so I am scratching my head here.

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