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  1. #1

    Dual motor gantry homing?

    Hello,

    First off, I've been using planet cnc with mk3/4 on two machines for 2+ years and it works really well. Compared it with a few other controllers in real semi-industrial applications and it's significantly faster/smoother.
    Which is why I want to use it on my new builds (a few machines actually), large routers with two motors rack&pinion driving a wide and rather heavy duty gantry. For that I would absolutely need to be able to home both sides of the gantry to maintain squareness, automatically.
    Connecting the two motors via belt is simply not an option, nor is it a real solution in this case.

    I've searched the forums and the manual and seen old posts about that not being possible with Planet cnc, despite repeated requests. I've seen some users that hacked somewhat of a solution, but making my own electronic boards and such is something I really don't have the time to fiddle with.

    Is this something that's possible to implement without making my own electronic circuits? or perhaps already been resolved?

    Cheers

  2. #2
    Moderator
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    Mar 2017
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    698

    Re: Dual motor gantry homing?

    In TNG it is possible to create homing script that does this. I don't have script here right now but if you are not in a hurry then wait for tutorial on this topic.

  3. #3

    Re: Dual motor gantry homing?

    Awesome, glad to hear that.

    Yes a tutorial will be greatly appreciated! Guess it's going to be time to take the plunge and make the move to TNG.

    Cheers!

  4. #4
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    Re: Dual motor gantry homing?

    Next TNG version will be awesome. I'm working on it right now and I'm very excited. But there is a lot more work to do.

  5. #5
    Registered
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    May 2008
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    259

    Re: Dual motor gantry homing?

    Quote Originally Posted by PlanetCNC View Post
    Next TNG version will be awesome. I'm working on it right now and I'm very excited. But there is a lot more work to do.
    Can't wait. I'm very pleased with TNG, it's proving to be reliable and smoooooth!
    When is G76 (screwcutting) going to be up & running again?

    Martin.

  6. #6
    Registered
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    Aug 2011
    Posts
    981

    Re: Dual motor gantry homing?

    Quote Originally Posted by PlanetCNC View Post
    Next TNG version will be awesome. I'm working on it right now and I'm very excited. But there is a lot more work to do.
    Any teaser? What are the planned changes?
    Box Joint and Dovetail CAM software here: WWW.TAILMAKER.NET

  7. #7
    Registered
    Join Date
    Apr 2012
    Posts
    88

    Re: Dual motor gantry homing?

    Yes a bit of a heads up, would be encouraging for loyal followers?

  8. #8

    Re: Dual motor gantry homing?

    Made the move to TNG a couple weeks ago on my smaller machine and so far really impressed! runs smoother and quieter, and the ability to customize the ui buttons/tabs is great.
    Now just need to sort out the dual motor homing so I can get on with the larger routers..

    So any chance of that tutorial or some help with a custom homing script?

    Cheers!

  9. #9
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    698

    Re: Dual motor gantry homing?

    Very soon. It should be by the end of this week.

  10. #10

    Re: Dual motor gantry homing?

    Alright great! waiting impatiently

  11. #11
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    Apr 2012
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    88

    Re: Dual motor gantry homing?

    Hey guys! Long way past the end of that week?? How about a timing update.

  12. #12

    Re: Dual motor gantry homing?

    Any progress with this?

  13. #13
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    Re: Dual motor gantry homing?

    Please follow this link for tutorial on gantry squaring:
    https://planet-cnc.com/wp-content/up...y-Squaring.pdf

    If you will have any troubles or doubts using this tutorial please contact us and we will help if you get stuck.

    We will also be very happy of any feedback. This way we will be able to improve this tutorial and make it more efficient and user friendly.

  14. #14
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    698

    Re: Dual motor gantry homing?

    Any feedback?

  15. #15

    Re: Dual motor gantry homing?

    Thank you. Yes that suffices as a workaround, although not the most elegant solution.
    Would be much better if we could run a custom homing script or a custom 'squaring' button without closing/changing profiles, and eliminate the possibility of whoever is running the machine forgetting to switch back to the regular working profile.
    I tend to look at homing before a job as good practice, making sure that everything is where it's supposed to be. with this method it can get kinda cumbersome.

    REALLY happy with TNG btw, been working a treat on my smaller machine save a couple small issues I found:
    1.'start from line' seems to change operating into exact stop mode? decelerating and accelerating for each line segment.
    2. on screen jog buttons cause jerky first movement.
    perhaps these two issues relate to the same thing?

  16. #16
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    Mar 2017
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    698

    Re: Dual motor gantry homing?

    Start from selected line has been discussed in separate topic.: https://www.cnczone.com/forums/plane...74780-cnc.html

    Regarding jerky jog movement:
    https://planet-cnc.com/planetcnc-tng...ce-guidelines/

    Please perform steps in this article, specially USB HUB connection of controller with PC.

    Best regards, Team PlanetCNC

  17. #17

    Join Date
    Feb 2019
    Posts
    67

    Re: Dual motor gantry homing?

    Can build a simple circuit on two chips CD4001BM, and not use the fourth axis.

    True, I did not check, but it should work.
    Attached Thumbnails Attached Thumbnails ?????.jpg  

  18. #18

    Join Date
    Nov 2015
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    189

    Re: Dual motor gantry homing?

    Quote Originally Posted by PlanetCNC View Post
    Please follow this link for tutorial on gantry squaring:
    https://planet-cnc.com/wp-content/up...y-Squaring.pdf

    If you will have any troubles or doubts using this tutorial please contact us and we will help if you get stuck.

    We will also be very happy of any feedback. This way we will be able to improve this tutorial and make it more efficient and user friendly.
    Work this whit latest version oder TNGv2 ?

  19. #19
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    698

    Re: Dual motor gantry homing?

    This is for old TNG.
    TNGv2 has gantry squaring script built in.

  20. #20

    Join Date
    Nov 2015
    Posts
    189

    Re: Dual motor gantry homing?

    Thanks, that's what I thought.
    Now it is so that I can not adjust the gantry squaring.
    There are various error messages.
    I set everything up as explained in the PDF. I just didn't do the script.

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