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IndustryArena Forum > WoodWorking Machines > DIY CNC Router Table Machines > 4TH Pass on G Code is way off on my CNC Machine
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  1. #1
    Join Date
    Dec 2017
    Posts
    53

    4TH Pass on G Code is way off on my CNC Machine

    HI


    OH Dear!


    Luckily im just setting up, praticing and learning CNC


    Ive gotten so far but im stuck on this


    Highlighted in Pink was my 4th Pass using ASPIRE Then to G Code using Mach 3

    The 4th Pass went well off to the Left! and ruined my test peace!

    The 1,2 and 3rd passes all went okay highlighted in black


    Does any one know why the 4th pass decided to start off at a different position?


    many thanks, and appreciate any help given


    adam

  2. #2
    Join Date
    Dec 2017
    Posts
    53

    Re: 4TH Pass on G Code is way off on my CNC Machine

    oh man

    Never had so much hassel attaching an image to a forum (chair)

  3. #3
    Join Date
    Dec 2017
    Posts
    53

    Re: 4TH Pass on G Code is way off on my CNC Machine

    Thanks one again guys, very much appreciated

    Okay a good update!

    I made the internal cabinet tidy

    I recall someone saying once that the Chinese controllers via USB can be temprimental and always better with CAT Style plug or the older style big parrell plugs

    So after i did that i made a new G Gode and sent that to the machne

    It cut it perfectly on 2 x passes

    But

    It was using Softcore board!

    So im not 100% but maybe its one of these three things!

    1: Dodgy interference via USB Cable but it is a sheilded cable im using! Interference from another source, or simply its cause its a USB out from controller to the PC

    2: The motors struggle on the 3rd pass on thicker wood! will require further testing though

    3: G Code issue?

    im still thinking 1,2 is the culprit

    The binding seems to happen and puts it off course, but this new cut was 100% but thats after i moved the NVUM controller to the rear of the enclosure and checked all the cables etc and it was only cutting softcore board not thicker dense ply


    Will update guys!

    the new okay cut!

    Attached Thumbnails Attached Thumbnails DSC00183.jpg  

  4. #4
    Join Date
    Nov 2014
    Posts
    724

    Re: 4TH Pass on G Code is way off on my CNC Machine

    Click on Go Advanced at the bottom of the text window and scroll down to Manage Attachments (or just click on the Paper Clip icon). From there browse to your photo(s). Hit the Paper Clip dropdown to insert the photo(s) where you want them in your text.
    David
    Romans 3:23
    Etsy shop opened 12/1/17 - CurlyWoodShop

  5. #5
    Join Date
    Dec 2017
    Posts
    53

    Re: 4TH Pass on G Code is way off on my CNC Machine

    attached is the image!!


    thanks too difalkner
    Attached Thumbnails Attached Thumbnails DSC02944.jpg  

  6. #6
    Join Date
    Jun 2005
    Posts
    1730

    Re: 4TH Pass on G Code is way off on my CNC Machine

    I would run the program again this time doing an air cut, no wood or anything. Single step the program and put a piece of paper on your machine and mark where the cutter moves. When u get to the forth pass you should see it move the machine in the wrong position. You can also run the gcode on a simulator which you can download for free and determine if the gcode is correct

    Russ

  7. #7
    Join Date
    Dec 2017
    Posts
    53

    Re: 4TH Pass on G Code is way off on my CNC Machine

    Thanks Russ(wedge)


    But running it again doesnt answer why it did this

    Anyone else have any ideas please?

    I will try some new G Codes etc

    But it would be handy too see why it did it in the first place

    adam

  8. #8
    Join Date
    Dec 2017
    Posts
    53

    Re: 4TH Pass on G Code is way off on my CNC Machine

    Well this morning i made a quick sign and was very happy it done okay on two passes:
    DSC00185.jpg

    However on my second cut this afternoon it went haywire again lol


    So not sure is it my G Code? or is it Interference? or is it dodgy nema 23 not having the stregth to pull over the wood, i think not as it seems to

    Just go way off what i want it to do!

    so what you guys rekon?

    Is it my dodgy G Code? maybe im saving it wrong ??? as there is a lot off different options to save as?

    Or is it interference? bad connection etc


    Screenshot 2021-05-22 170828.jpg

    what it looks like on aspre

    what it looks li
    ke when it was cutting


    DSC00186.jpg

  9. #9
    Join Date
    Nov 2008
    Posts
    643

    Re: 4TH Pass on G Code is way off on my CNC Machine

    I would assume that the problem isn’t coming from Aspire. You can simulate the cut in Aspire.
    Two things would cause this from the machine. Stepper looses steps or stepper shaft not tight.
    Why those aren’t issues is they happen under load not between passes.
    So my guess is that Aspire is sending some code that your controller doesn’t understand
    I’d start removing lines of code and see what happens. Also try a simple shape like a square. Or code it by hand. Have fun, it’s a good way to learn.


    Sent from my iPhone using Tapatalk

  10. #10
    Join Date
    Dec 2017
    Posts
    53

    Re: 4TH Pass on G Code is way off on my CNC Machine

    Stepper looses steps or stepper shaft not tight.what is that? and how does it loose steps?

    My thoughts were

    It could be the way i saved the G-Code in Aspire? as there is sevral options

    It looses steps, but not sure how that happens

    Saying this i was hoping someone elese has had this happen to them before

    Today i will try more new shaps, and texts

    and will update

    But always handy to know 100% how it happened


    Thanks for the input guys , cheers

  11. #11
    Join Date
    May 2004
    Posts
    210

    Re: 4TH Pass on G Code is way off on my CNC Machine

    Start a process of elimination to find the problem. Use a gcode viewer to look at your code first. I use https://ncviewer.com/ but there are plenty to choose from. It will tell you if it is your machine or the gcode.

  12. #12
    Join Date
    Dec 2017
    Posts
    53

    Re: 4TH Pass on G Code is way off on my CNC Machine

    mmmmmmmmmmmmmmmmmmmmmmm

    Sadly happened again!

    I saved as G Code Mach 3

    and even on my first cut it went haywire!

    I then said lets try no G Code and a straight cut using my keyboard

    I pressed the arrow key firmly and it will move perfectly >>>>>>>>>>>>>>>> Then it just stopped!

    so tried a few times it will move using the keyboard arrow key so much then it just stops!

    This is making me think its hardware issues somewhere?:drowning::drowning:

  13. #13
    Join Date
    Dec 2017
    Posts
    53

    Re: 4TH Pass on G Code is way off on my CNC Machine

    MMMMMMMMMMM

    Could also be the Windows 7 PC

    As the Wireless Mouse and Keyboard dont work 90% of the time, PITA now

    Im going to try this on another PC soon! (chair)

  14. #14
    Join Date
    Dec 2017
    Posts
    53

    Re: 4TH Pass on G Code is way off on my CNC Machine

    The Y Axis in MACH3 Was ticked and the X wasnt! in DIR LOW Active

    i just unticked it, dont think that would of helped any as the X wasnt ticked

  15. #15
    Join Date
    May 2004
    Posts
    210

    Re: 4TH Pass on G Code is way off on my CNC Machine

    Calm down, these are simple machines. First off, you need to be methodical in your approach. Try jogging each axis in turn to see if that works OK. Does it stop in the same location? On the one(s) that fail, disconnect the motor and move it by hand to see if there is any binding. (that's my guess but you've presented zero info about your machine...) If it is a dual motor moving gantry, maybe it racks?

    But before anything else, make sure everything is tightened up. Even if it seems solid, even a small amount of slop can cause problems.

  16. #16
    Join Date
    Dec 2017
    Posts
    53

    Re: 4TH Pass on G Code is way off on my CNC Machine

    Thats a great reply, thanks philba i had it working last year must be something simples

    But will try that now!

  17. #17
    Join Date
    Dec 2017
    Posts
    53

    Re: 4TH Pass on G Code is way off on my CNC Machine

    I THINK!!!!!!!!!!!!!!!!


    Ive just made a major discovery!


    When switched the X Axis and the Z Axis is SOLID! When you Push or Pull these two axis it doesnt move!

    The Y Axis Moves manually Easily bby about 1cm back and forth! Now that must be the issue?

    Somewhere somewhow the Y Axis is moving freely by about 1cm before being the same as the X and Z

    So it has to be something to do with my Y Axis

    Im not sure now if its mechanical or its a fault in the motor etc, But i think its been established that its a mechanical fault somewhere on the Y axis

    wherever its the belt, bolts, nuts or nema 23 issue!

    Y AXIS I think is the culprit

    Working on that now!

  18. #18
    Join Date
    Dec 2017
    Posts
    53

    Re: 4TH Pass on G Code is way off on my CNC Machine


  19. #19
    Join Date
    Dec 2017
    Posts
    53

    Re: 4TH Pass on G Code is way off on my CNC Machine

    FFS!

    Its happening still


    I just installed a new motion controller
    ZKMotion Mach3 4 Axis USB CNC Motion Card

    And now my drivers use 4 x wires insted of 3 before

    Still im getting cocked up signs lol

    I sit Motor tuning? this is something im still working on guys!

    with the new controller! Seems to do its own thing and doesnt follow the sip[le GCode as attached

    any ideas guys




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    M30

  20. #20
    Join Date
    Jun 2005
    Posts
    1730

    Re: 4TH Pass on G Code is way off on my CNC Machine

    This appears to be binding in your machine. You can so some simple gcode commands on your machines, such as follows:
    First home your machine, did it get home successfully?
    Now in your MDI entry, type
    G1 X5 F50 does it move to the right five inches?
    G1 Y5 F50 does it move in the Y direction five inches?

    With the machine powered down can you move the X and Y axis smoothly? You could have a loose coupler from the stepper motor to the ballscrew or leadscrew.

    Post a picture of your machine.

    Russ

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